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52B-1
GROUP 52B
SUPPLEMENTAL RESTRAINT
SYSTEM (SRS)CONTENTS
GENERAL INFORMATION . . . . . . . . 52B-3
SERVICE PRECAUTIONS. . . . . . . . . 52B-24
SRS AIR BAG DIAGNOSIS. . . . . . . . 52B-27INTRODUCTION TO
DIAGNOSIS . . . . . . . 52B-27TROUBLESHOOTING STRATEGY . . . . . .
52B-27DIAGNOSTIC FUNCTION . . . . . . . . . . . . . 52B-27SRS
WARNING LIGHT CHECK . . . . . . . . . 52B-30PASSENGER'S SEAT BELT
WARNING LIGHT CHECK . . . . . . . . . . . . . . . . . . . . . . . .
. . . . 52B-30PASSENGER'S AIR BAG OFF INDICATOR LIGHT CHECK . . . .
. . . . . . . . . . . . . . . . . . . . . . . . 52B-30CHECK CHART
FOR DIAGNOSIS CODES 52B-32DIAGNOSTIC TROUBLE CODE PROCEDURES. . . .
. . . . . . . . . . . . . . . . . . 52B-38DIAGNOSTIC TROUBLE CODE
CHART
. . . . . . . . . . 52B-292DIAGNOSTIC TROUBLE CODE PROCEDURES .
. . 52B-294TROUBLE SYMPTOM CHART . . . . . . . . . . 52B-344SYMPTOM
PROCEDURES . . . . . . . . . . . . 52B-345DATA LIST REFERENCE
TABLE. . . . . . . . 52B-354ACTUATOR TEST REFERENCE TABLE . .
52B-355FAIL-SAFE FUNCTION REFERENCE TABLE . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 52B-355ACCURACY CHECK OF OCCUPANT
CLASSIFICATION SENSOR. . . . . . . . . . . . 52B-355
SPECIAL TOOLS . . . . . . . . . . . . . . . . 52B-356
TEST EQUIPMENT. . . . . . . . . . . . . . . 52B-357
Continued on next page
Battery posts, terminals and related accessories contain lead
and lead compounds. WASH HANDS AFTER HANDLING.
WARNING
WARNING Carefully read and observe the information in the SRS
SERVICE PRECAUTIONS prior to any service. For information
concerning diagnosis or maintenance, always observe the procedures
in the SRS Diagnosis or
the SRS Maintenance sections, respectively.
If any SRS components are removed or replaced in connection with
any service procedures, be sure to follow the
procedures in the INDIVIDUAL COMPONENT SERVICE section for the
comportments involved. If you have any questions about the SRS,
please contact the MMNA Tech Line.
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52B-2
POST-COLLISION DIAGNOSIS . . . . 52B-358
INDIVIDUAL COMPONENT SERVICE52B-364
ON-VEHICLE SERVICE. . . . . . . . . . . 52B-364ACCURACY CHECK OF
OCCUPANT CLASSIFICATION SENSOR . . . . . . . . . . . 52B-364
FRONT IMPACT SENSORS . . . . . . . 52B-367REMOVAL AND
INSTALLATION . . . . . . . . 52B-367INSPECTION . . . . . . . . . .
. . . . . . . . . . . . . 52B-370
SRS CONTROL UNIT (SRS-ECU). . . 52B-371REMOVAL AND INSTALLATION
. . . . . . . . 52B-371INSPECTION . . . . . . . . . . . . . . . . .
. . . . . . 52B-374
DRIVER'S AIR BAG MODULE AND CLOCK SPRING . . . . . . . . . . . .
. . . . . . . . . . . 52B-375
REMOVAL AND INSTALLATION . . . . . . . . 52B-375INSPECTION . . .
. . . . . . . . . . . . . . . . . . . . 52B-380
PASSENGER'S (FRONT) AIR BAG MODULE . . . . . . . . . . . . . . .
. . . . . . . 52B-382
REMOVAL AND INSTALLATION . . . . . . . . 52B-382INSPECTION . . .
. . . . . . . . . . . . . . . . . . . . 52B-385
KNEE AIR BAG MODULE. . . . . . . . . 52B-386REMOVAL AND
INSTALLATION . . . . . . . . 52B-386INSPECTION . . . . . . . . . .
. . . . . . . . . . . . . 52B-389
SIDE-AIRBAG MODULE(S). . . . . . . . 52B-390REMOVAL AND
INSTALLATION . . . . . . . . 52B-390
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
52B-393
CURTAIN AIR BAG MODULE(S). . . . 52B-394REMOVAL AND INSTALLATION
. . . . . . . . 52B-394INSPECTION. . . . . . . . . . . . . . . . .
. . . . . . . 52B-397
SIDE IMPACT SENSOR . . . . . . . . . . . 52B-398REMOVAL AND
INSTALLATION . . . . . . . . 52B-398INSPECTION. . . . . . . . . . .
. . . . . . . . . . . . . 52B-400
SEAT BELTS WITH PRE-TENSIONER. . . . . . . . . . . . . . . .
52B-401
REMOVAL AND INSTALLATION . . . . . . . . 52B-401INSPECTION. . .
. . . . . . . . . . . . . . . . . . . . . 52B-405
SEAT SLIDE SENSOR . . . . . . . . . . . . 52B-405REMOVAL AND
INSTALLATION . . . . . . . . 52B-405INSPECTION. . . . . . . . . . .
. . . . . . . . . . . . . 52B-407
OCCUPANT CLASSIFICATION-ECU 52B-408REMOVAL AND INSTALLATION . .
. . . . . . 52B-408INSPECTION. . . . . . . . . . . . . . . . . . .
. . . . . 52B-410
PASSENGER SEAT WEIGHT SENSOR . . . . . . . . . . . . . . . . . .
. . . . . 52B-410
REMOVAL AND INSTALLATION . . . . . . . . 52B-410INSPECTION. . .
. . . . . . . . . . . . . . . . . . . . . 52B-412
AIR BAG MODULE DISPOSAL PROCEDURES . . . . . . . . . . . . . . .
. . . 52B-412
SEAT BELT PRE-TENSIONER DISPOSAL PROCEDURES . . . . . . . . . .
. . . . . . . . 52B-427
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-3
GENERAL INFORMATIONM1524000102491
DANGERThe SRS-ECU adopts the rollover specifica-tion that the
curtain airbag and seat belt pre-tensioner operate at the
occurrence of rollover. Therefore, do not tilt the vehicle to the
right and left with the IG ON or tilt the SRS-ECU to the right and
left with the IG ON and the harness installed..
WARNINGImproper service could result in serious injury of the
service personnel or the pas-senger..
The SRS is designed to supplement the front seat belts. It
reduces injury to the driver(s) and the front passenger(s) by
deploying air bag(s) in case of a frontal collision. In addition,
the side-airbag and cur-tain air bag inflate upon a side collision
to reduce the risk of passenger injuries.The SRS front air bags
from an advanced air bag system together with sensors at the
vehicle and sen-sors attached to front seats..
Side-airbag systems in the front seats are activated when side
impacts exceed a criteria to protect the occupants upper
bodies..
The curtain airbag system operates together with the side-airbag
to protect the heads of passengers in the front and second
seats..
The seat belts with pre-tensioner work simulta-neously with the
SRS. The seat belt incorporating the pre-tensioner automatically
winds the seat belt upon front impact to reduce forward shifting of
the drivers and passengers. The seat belt use status is used to
control the activation and deactivation of the pre-ten-sioner..
The SRS consists of air bag modules, SRS air bag control unit
(SRS-ECU), front impact sensors, side impact sensors, SRS warning
light, passengers air bag OFF indicator light, passengers seat belt
warn-ing light, clock spring, seat belt pre-tensioner, seat belt
switch, seat slide sensor, weight sensor and occupant
classification-ECU. Air bag modules are located in the center of
the steering wheel and above the glove box. Knee air bag is
installed under the col-umn cover. Side-airbags are located inside
the front seatback assemblies. The curtain air bag module consists
of an air bag, an inflator, and the fixing gear relating to those
parts, and is installed in the roof side sections (from the
driver's and the passenger's front pillars to the rear pillars).
Each air bag consists of a folded air bag and an inflator unit. The
SRS-ECU placed on the forefront of the floor monitors the sys-tem
and has a front air bag safing G-sensor, front air bag analog
G-sensor and a side-airbag safing G-sensor. The front impact sensor
is assembled in the front end upper bar to monitor impact in case
of front impact. The side impact sensors inside the cen-ter pillars
and the rear quarter panel monitor the shock incurred by the sides
of the vehicle. The SRS warning light on the combination meter
indicates the operational status of the SRS. The clock spring is
installed in the steering column. The seat belt pre-tensioner is
built into the driver's and passen-ger's front seat belt retractor.
The seat slide sensor is installed at the seat adjuster section of
the driver seat in order to detect the driver seat slide position.
The weight sensor is installed underneath a rail of the passenger
seat to detect the load on the seat. The passengers air bag OFF
indicator light is installed to the lower left of the center panel,
and illu-minates when the passenger seat airbag is inactive. The
passengers seat belt warning light is installed to the lower right
of the center panel, and illuminates when the passenger is not
wearing the seat belt. The seat belt switch detects whether the
seat belt is used.Only authorized service personnel should do work
on or around the SRS components. Those service per-sonnel should
read this manual carefully before start-ing any such work.
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-4
ON-BOARD DIAGNOSTIC/SRS WARNING LIGHT FUNCTIONThe SRS-ECU
monitors the SRS system and stores data con-cerning any detected
faults in the system. When the ignition switch is in "ON" position,
the SRS warning light, passengers air bag OFF indicator light and
passengers seat belt warning light should illuminate for about
seven seconds and then turn "OFF." That indicates that the SRS
system is in operational order. If the SRS warning light does any
of the following, the immediate inspection by an authorized dealer
is needed:1. The SRS warning light does not illuminate as
described
above.2. The SRS warning light stays on for more than seven
seconds.3. The SRS warning light illuminates while driving.If a
vehicle's SRS warning light is in any of these three condi-tions,
the SRS system must be inspected, diagnosed and ser-viced in
accordance with this manual.
AC905530
SRS warning light
AB
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-5
CONSTRUCTION DIAGRAM
NOTE: This construction diagram shows the general view of the
SRS components. For details, refer to "Schematic (P.52B-9),
"Configuration Diagrams (P.52B-12), " and "Circuit Diagram
(P.52B-13)".
ACA03533
ACA03210
Side impact sensor (front)
Side impact sensor (rear)
Side-airbag module
Seat belt pre-tensioner
Occupant classification-ECU
Seat slide sensor
AB
Curtain air bag module
Front impact sensor
Weight sensor
Seat belt pre-tensioner
Inner seat belt (seat belt buckle switch)
SRS-ECU
SRS warning lamp
Driver's air bag module
Clock spring
Passenger's (front) air bag module
Passenger's air bag OFF indicator light Knee air bag module
Data link connector
Passenger's seat belt warning lightTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-6
WARNING/CAUTION LABELSA number of caution labels related to the
SRS are found in the vehicle, as shown in the following
illustrations. Follow label instructions when servicing SRS. The
label I is not to be removed except by owner. If the other labels
are dirty or damaged, replace them.
AC904461 AC904497
AC904540
AC904861 AC904335
ACA03025ACA03014
ACA03013
ACA03208
Driver's air bag module SRS-ECUPassenger's (front)air bag
module
Knee air bag module Sunvisor
Seat belt pre-tensioner(right and left)
Side-airbag module(right and left)
Curtain air bag module(right and left)
Glove boxCenter pillar (right and left)
G
F
ED
B
C
I
J
A
H
E
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-7
Label contentsA, B, D DANGER
FLAMMABLE EXPLOSIVEDO NOT:DISASSEMBLE; HEAT; INCINERATE; APPLY
ELECTRICITY;OR STORE AT HIGH TEMPERATURE (93C or HIGHER).REFER TO
WORKSHOP MANUAL FOR DETAILS.
C CAUTION: DO NOT DISASSEMBLE OR DROP. IF DEFECTIVE, REFER TO
SERVICE MANUAL.
E
WARNINGEVEN WITH ADVANCED AIR BAGS Children can be killed or
seriously injured by the air bag The back seat is the safest place
for children Never put a rear-facing child seat in the front Always
use seat belts and child restraints See owners manual for more
information about air bags
E
WARNINGDEATH or SERIOUS INJURY can occur Children 12 and under
can be killed by the air bag. The BACK SEAT is the SAFEST place for
children. NEVER put a rear-facing child seat in the front. Sit as
far back as possible from the air bag. ALWAYS use SEAT BELTS and
CHILD RESTRAINTS.
F DANGER; BELT PRETENSIONER DO NOT DISSEMBLE OR IMPACT. REFER TO
SERVICE MANUAL FOR INSTRUCTION, HANDLING, STORAGE AND
DISPOSAL PROCEDURES.G WARNING
SRS AIR BAG MODULE FLAMMABLE/EXPLOSIVETO AVOID SERIOUS INJURY:
DO NOT REPAIR, DISASSEMBLE OR TAMPER. AVOID CONTACT WITH FLAME OR
ELECTRICITY. DO NO DIAGNOSIS/USE NO TEST EQPT OR PROBES. STORE
BELOW 200F (93C). BEFORE DOING ANY WORK INVOLVING MODULE. READ
SERVICE MANUAL
FOR IMPORTANT FURTHER DATA.H DANGER
FLAMMABLE EXPLOSIVESRS AIR BAG MODULE Do not disassemble or
shock Do not heat or incinerate. Do not contact with electricity or
tester probes. Do not test or diagnose. Do not store in more than
200 F (93 C). Store the air bag cover is top. For information on
handling, replacement, and disposal methods, refer to the
service
AC306673TSB Revision
manual.
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-8
I SRS SIDE AIRBAGWARNINGTO AVOID SERIOUSINJURY OR DEATH: Do not
lean against the door. Do not use seat covers. See owners manual
for more information
J
This Vehicle is Equipped with Advanced Air Bags Even with
Advanced Air BagsChildren can be killed or seriously injured by the
air bag. The back seat is the safest place for children.Never put a
rear-facing child seat in the front.Always use seat belts and child
restraints.See owners manual for more information about air
bags.Not to be removed except by owner.
J
WARNINGMISE EN GARDEChildren Can Be KILLED or INJURED by
Passenger Air Bag The back seat is the safest place for children 12
and under.Make sure all children use seat belts or child seats.Not
to be removed except by owner.
Label contentsTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-9
SCHEMATIC
ACA03532
Side-airbag module (LH)
Side-airbag module (RH)
Seat belt pre-tensioner (LH)
Seat belt pre-tensioner (RH)
Side impact sensor (Front: LH)
Side impact sensor (Front: RH)
Data link connector (for scan tool)
Combination meter
CLOCK SPRING
Driver's air bag module
Passenger's (front) air bag module
Seat belt switch (Passenger's side)
CAN bus line
Front impact sensor (RH)
Front impact sensor (LH)
Curtain air bag module (LH)
Curtain air bag module (RH)
AB
SRS-ECUIgnition switch (IG1) Fusible link
Note* : Connector lock switch Connector connected: ON Connector
disconnected: OFF
ONOFF
OFF
OFFON ON
OFF
ONOFF
ON
ON
OFFON
OFFON
OFF
ONOFFON
OFF
OFF
ONOFFON
ONOFFON
OFF
ONOFF
OFF
OFFON ON
ON
OFF
ONOFF
ON
OFF
OFFON
OFF
ONOFFONOFF
ONOFF
ONOFF
ONOFF
ONOFF
ON
ONOFF
ON
ONOFFON
OFF
ONOFFON
OFF
ONOFF
ON
OFF
OFFON
OFF
ON
ONOFF
ON
OFF
OFF
ONOFF
ON
OFF
ONOFF
ON
OFF
ONOFF
ON
OFF
ONOFF
ON
OFF
ON
7.5A 7.5AETACS-ECU Passenger's air bag
OFF indicator light
OFF
IG1 RELAY
Driver's knee air bag module
Seat belt switch (Driverr's side)
Side impact sensor (Rear: LH)
Side impact sensor (Rear: RH)TSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-10
SRS AIR BAG SPECIAL CONNECTOR.
To enhance the system reliability, a connector short circuiting
mechanism is integrated in the SRS-ECU connector, air bag module
connectors, clock spring connector, pre-tensioner con-nectors, and
intermediate connector between curtain air bag module and SRS-ECU
(black connector "A" shown in the fig-ure).
.
ACA03536
A
A A
A
A
A
A
A
A
Side-airbag module (RH)
Seat belt pre-tensioner (LH)
Side-airbag module (LH)
Seat belt pre-tensioner (RH)
Passenger's (front) air bag module
Driver's air bag module
Curtain air bag module (LH)
Curtain air bag module (RH)
Driver's knee air bag module
Clock springSRS-ECU
A
A
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-11
SQUIB CIRCUIT CONNECTOR LOCK SWITCH
This mechanism prevents the improper deployment of air bag
module because of the current application to the squib due to the
static electricity when connec-tors between SRS-ECU and air bag
modules (squibs) are disconnected. When the connector is
disconnected, the short spring short circuits the power supply side
terminal and ground side terminal of squibs, and prevents the
static electricity from generating the potential difference. This
connector mechanism is adopted for the following connectors.
SRS-ECU connector Connector between the clock spring and
body-side wiring harness Each air bag module connector Each
pre-tensioner connector Intermediate connector between curtain air
bag
module and SRS-ECU
AC904997AC
SRS-ECU connector
Partition panel
Wiring harness-side connector (terminal to short-circuit)
Short spring Partition panel (SRS-ECU-side connector)l
Short spring (wiring harness-side connector)
Connector connected
Terminal to short-circuit
Wiring harness-side connectorTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-12
CONFIGURATION DIAGRAMS
ACA03517
A-58
C-316
C-313
C-114
C-203
C-124C-125C-126
D-46D-33
D-40D-39
D-32
D-48
D-09D-17
D-43
D-29D-28
D-03
D-01
D-42
AB
STEERING COLUMNENGINE COMPARTMENT
C-205
FLOOR
INSTRUMENT PANEL
C-223
A-45
C-227TSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-13
CIRCUIT DIAGRAMWARNING
Do not repair, splice, or modify the SRS wiring (except for
specific repairs to the instrument panel wiring harness and the
floor wiring harness shown on P.52B-24): replace the wiring if
necessary, after read-ing and following all precautions and
pro-cedures in this manual.
Do not use an analog ohmmeter to check the SRS wiring or
components; use only the special tools (refer to P.52B-356) and a
digital multi-meter (refer to P.52B-357).CAUTION
Improper services cause the system to be inop-erative. Do not
disassemble or tamper with the SRS components to prevent the
serious injury.
A-45 (Y) Front impact sensor (LH) A-58 (Y) Front impact sensor
(RH) C-114 (Y) Passengers (Front) air bag moduleC-124 (Y)
SRS-ECUC-125 (Y) SRS-ECU C-126 (Y) SRS-ECU C-203 Combination
meterC-205 (GR) Center panel unit C-223 (B) Drivers knee air bag
moduleC-227 (B) Date link connector
ACA03524
D-48-5
D-48-3
D-48-1D-48-2
D-48-4D-48-6
AB
SEAT C-313 (Y) Clock springC-316 (B) Drivers air bag moduleD-01
(Y) Side impact sensor (Front: RH)D-03 (B) Seat belt pre-tensioner
(RH)D-09 (B) Curtain air bag module (RH) D-17 (B) Curtain air bag
module (LH)D-28 (B) Seat belt pre-tensioner (LH)D-29 (Y) Side
impact sensor (Front: LH)D-32 (Y) Side-airbag module (LH)D-33 (B)
Seat belt switch (Drivers side)D-39 (Y) Side-airbag module (RH)D-40
(B) Seat belt switch (Passengers side)D-42 (Y) Side impact sensor
(Rear: RH)D-43 (Y) Side impact sensor (Rear: LH)D-46 (GR) Seat
slide sensorD-48 Front seat assembly (RH)D-48-1 Occupant
classification-ECUD-48-2 Occupant classification-ECUD-48-3 Weight
sensor (Front:LH)D-48-4 Weight sensor (Front:RH)D-48-5 Weight
sensor (Rear:LH)D-48-6 Weight sensor (Rear:RH)TSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-14
ACA03462
FRONT IMPACT SENSOR (LH)
FRONT IMPACT SENSOR (RH)
SRS-ECU
CLOCK SPRING
DRIVER'S AIR BAGMODULE (SQUIB)
DRIVER'S AIR BAGMODULE (SQUIB)
NOTE: CONNECTOR LOCK SWITCH CONNECTOR COUPLED : ONCONNECTOR
UNCOUPLED : OFF
ABTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-15
ACA03463
DRIVER'S KNEE AIR BAG MODULE (SQUIB) SEAT BELT PRE-TENSIONER
(LH)
PASSENGER'S (FRONT)AIR BAG MODULE (SQUIB)
SEAT BELT PRE-TENSIONER (RH)
SRS-ECU
NOTE: CONNECTOR LOCK SWITCH CONNECTOR COUPLED : ONCONNECTOR
UNCOUPLED : OFF
ABTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-16
ACA03464
SIDE IMPACT SENSOR (LH)SIDE IMPACT SENSOR (REAR: LH)
SIDE-AIRBAG MODULE (SQUIB) (LH)
CURTAIN AIR BAG MODULE (SQUIB) (LH)
NOTE: CONNECTOR LOCK SWITCH CONNECTOR COUPLED : ONCONNECTOR
UNCOUPLED : OFF
AB
SRS-ECUTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-17
ACA03465
SIDE IMPACT SENSOR (RH)
SIDE IMPACT SENSOR (REAR: RH)
SIDE-AIRBAG MODULE(SQUIB) (RH)
CURTAIN AIR BAG MODULE (SQUIB) (RH)
CENTER PANEL UNIT
12
INTERFACE CIRCUIT
AIR BAG OFF INDICATOR LIGHTPASSENGER'S SIDE
ETACS-ECU (FUSE )
SRS-ECU
AB
NOTE: CONNECTOR LOCK SWITCH CONNECTOR COUPLED : ONCONNECTOR
UNCOUPLED : OFFTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-18
ACA03466
ETACS-ECU
IG1 RELAY
SRS-ECU
JOINTCONNECTOR (2)
FUSIBLELINK 34
IGNITION SWITCH (IG1) OR OSS-ECU (IG1)
ABTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-19
FRONT SIDE
COMBINATION METER
CPU
CAN DRIVE CIRCUIT
INTERFACE CIRCUIT
CAN DRIVE CIRCUIT
INTERFACE CIRCUIT
ETACS-ECU
CAN TRANSCEIVER CIRCUIT
RHEOSTATLCD (SRS)
(FUSE )12DATA LINK CONNECTOR
GROUNDING CONNECTOR
JOINTCONNECTOR (CAN1)
ACA03467ABTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-20
ACA03468
(FUSE )17ETACS-ECU
OCCUPANT CLASSIFICATION-ECU
SEAT SLIDE SENSOR
FRONT SEAT ASSEMBLY (RH)
JOINT CONNECTOR (CAN1)
HALL IC
ABTSB Revision
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-21
ACA03469
WEIGHT SENSOR (FRONT: LH)
WEIGHT SENSOR (REAR: LH)
WEIGHT SENSOR (REAR: RH)
WEIGHT SENSOR (FRONT: RH)
OCCUPANT CLASSIFICATION-ECU
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-22
HALL IC
ACA03470
SEAT BELT SWITCH DRIVER'S SIDE
SRS-ECU
HALL IC
SEAT BELT SWITCH PASSENGER'S SIDE
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GENERAL INFORMATIONSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-23
COMPONENT LOCATION
NOTE: The illustration above shows the front impact position of
the front impact sensor (LH) and the side
AC905341
AC904903
ACA03556
ACA03106
Occupant classification-ECU
Seat slide sensor
Weightsensor
Data link connector
Side impact sensor (Rear)
Side impact sensor (Front)
Front impact sensor
F
Curtain air bag module
Driver's air bag moduleClock spring Passenger's (front) air bag
module
G and yawrate sensor
SRS-ECU
ETACS-ECU
Head light assembly (LH)
Front seat belt (LH)
AB
Rear seat beltTSB Revision
sensor (RH) and the side impact sensor (RH). The impact sensor
(LH) is symmetrical to this.
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SERVICE PRECAUTIONSSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-24
SERVICE PRECAUTIONSM1524000301975
DANGER In order to avoid injury to yourself or others from
accidental deployment of the air bag during servic-ing, read and
carefully follow all the precautions and procedures described in
this manual.
After disconnecting the battery cable, wait 60 sec-onds or more
before proceeding with the following work. The SRS system is
designed to retain enough voltage to deploy the air bag for a short
time even after the battery has been disconnected, so serious
injury may result from unintended air bag deployment if work is
done on the SRS system immediately after the battery cables are
discon-nected.
The SRS-ECU adopts the rollover specification that the curtain
airbag and seat belt pre-tensioner operate at the occurrence of
rollover. Therefore, do not tilt the vehicle to the right and left
with the IG ON or tilt the SRS-ECU to the right and left with the
IG ON and the harness installed.WARNING
Battery posts, terminals and related accessories contain lead
and lead compounds. WASH HANDS AFTER HANDLING.
Certain components of this vehicle, such as air bag modules and
seat belt pre-tensioners, may contain perchlorate materials.
Special handling may apply. For additional information, see
www.dtsc.ca.gov/hazardouswaste/perchlorate.
Do not use any electrical test equipment on or near the SRS
components, except those specified on P.52B-357.
Never Attempt to Repair the Following Compo-nents: SRS-ECU,
Clock Spring, Air Bag Module, Front impact sensor, Side Impact
Sensor, Seat Belt with Pre-tensioner, Seat slide sensor, Front seat
assembly. If any of these components are diag-nosed as faulty, they
should only be replaced, in accordance with the INDIVIDUAL
COMPONENT SERVICE procedures in this manual, starting on
P.52B-364.
AC300580AB
Insulating tapeBattery
Battery cableTSB Revision
-
SERVICE PRECAUTIONSSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-25
Do not attempt to repair the wiring harness con-nectors of the
SRS. If any of the connectors are diagnosed as faulty, replace the
wiring harness. If the wires are diagnosed as faulty, replace or
repair the wiring harness according to the following table.
.
AC905461AE
SRS-ECU connector
SRS-ECU terminal No. Destination of harness Corrective action1,
2 Instrument panel wiring harness
Knee air bag moduleCorrect or replace the instrument panel
wiring harness
3, 4 Instrument panel wiring harness Clock spring Driver's air
bag module 2nd squib side
Correct or replace the instrument panel wiring harness. Replace
the clock spring.
5, 6 Instrument panel wiring harness Clock spring Driver's air
bag module 1st squib side
7, 8 Instrument panel wiring harness Passenger's (front) air bag
module 1st squib side
Correct or replace the instrument panel wiring harness.
9, 10 Instrument panel wiring harness Passenger's (front) air
bag module 2nd squib side
13 Instrument panel wiring harness Air bag OFF indicator
light
17, 27 Instrument panel wiring harness Front wiring harness
Front impact sensor (LH)
Correct or replace each wiring harness.
18, 28 Instrument panel wiring harness Front wiring harness
Front impact sensor (RH)
21 Floor wiring harness ETACS-ECU (fuse No. 18)
Correct or replace the floor wiring harness.
22 Floor wiring harness ETACS-ECU (fuse No. 12)
24 Instrument panel wiring harness Ground
Correct or replace the instrument panel wiring harness.
29, 30 Instrument panel wiring harness CAN bus lineTSB
Revision
-
SERVICE PRECAUTIONSSUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-26
.
WARNING The SRS components and seat belt with pre-ten-
sioner should not be subjected to heat, so remove the SRS-ECU,
drivers and front passengers air bag modules, clock spring, knee
air bag module, side-airbag modules, Curtain air bag modules, front
and side impact sensor and seat belt pre-ten-sioner before drying
or baking the vehicle after painting.
SRS-ECU, air bag module, clock spring, impact sensor: 93 C (200
F) or more
Seat belt with pre-tensioner 90C (194 F) or more
After servicing the SRS system, check the warning light
operation to make sure that the system func-tions properly. (Refer
to P.52B-3).
Make certain that the ignition switch is in the "LOCK"(OFF)
position when the scan tool is con-nected or disconnected.
31, 32 Floor wiring harness Front passenger's seat belt
pre-tensioner
Correct or replace the floor wiring harness.
33, 38 Floor wiring harness Passengers seat belt switch
36, 37 Floor wiring harness Curtain air bag module (LH)
39, 40 Floor wiring harness Side-airbag module (LH)
41, 42 Floor wiring harness Side impact sensor (LH)
44, 45 Floor wiring harness Side impact sensor (Rear: LH)
53, 58 Floor wiring harness Drivers seat belt switch
54, 55 Floor wiring harness Driver's seat belt pre-tensioner
56, 57 Floor wiring harness Side-airbag module (RH)
59, 60 Floor wiring harness Curtain air bag module (RH)
61, 62 Floor wiring harness Side impact sensor (Rear: RH)
64, 65 Floor wiring harness Side impact sensor (RH)
SRS-ECU terminal No. Destination of harness Corrective actionTSB
Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-27
SRS AIR BAG DIAGNOSISINTRODUCTION TO DIAGNOSIS
M1524005000534The SRS system is controlled by the SRS-ECU. The
SRS-ECU judges how severe a collision is by detect-ing signals from
the left and right front impact sen-sors and side impact sensors,
front air bag analog G-sensor and front air bag safing G-sensor and
side-airbag safing G-sensor. If the impact is over a predetermined
level, the SRS-ECU sends an ignition signal. At this time, if the
safing G-sensor is on, the SRS air bag will inflate. (The
passenger's air bag may not inflate according to the occupant
detection data from the occupant classification-ECU.) The
SRS warning light in the combination meter alerts a malfunction
of the SRS system. If the following symptoms occur even when the
vehicle has not been in a collision, there may be a malfunction in
the SRS system.
The SRS warning light does not go off within approximately seven
seconds after the ignition switch has been turned to the "ON"
position.
The SRS warning light does not illuminate when the ignition
switch is turned to the "ON" position.
Refer to Post-collision Diagnosis when inspecting and servicing
a vehicle that has been in a collision (Refer to P.52B-358).
TROUBLESHOOTING STRATEGYM1524003100933
Use these steps to plan your diagnostic strategy. If you follow
them carefully, you will be sure that you have exhausted all of the
possible ways to find a SRS fault.1. Gather information about the
problem from the
customer.2. Verify that the condition described by the
customer exists.3. Check the vehicle for any SRS diagnostic
trouble
codes (SRS DTC).4. If you cannot verify the condition but there
are no
SRS DTCs, the malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting Inspection Service Points How to Cope
with Intermittent Malfunctions P.00-15.
5. If there is a SRS DTC, record the code number, then erase the
code from vehicle memory using scan tool (M.U.T.-III Sub Assembly)
MB991958.
6. Recreate the SRS DTC set conditions to see if the same SRS
DTC will be set again.
If the same SRS DTC is set again, follow the Inspection Chart
for the DTC and find the fault.
If you cannot get the same SRS DTC to be set again, the
malfunction is intermittent. Refer to GROUP 00, How to Use
Troubleshooting Inspection Service Points How to Cope with
Intermittent Malfunctions P.00-15.
DIAGNOSTIC FUNCTIONM1524013800223
HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)Required Special
Tools:
MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824:Vehicle
Communication Interface(V.C.I.) MB991827:M.U.T.-III USB Cable
MB991910:M.U.T.-III Main Harness ATSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-28
CAUTIONTo prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-necting or
disconnecting scan tool MB991958.1. Ensure that the ignition switch
is at the "LOCK" (OFF)
position.2. Start up the personal computer.3. Connect special
tool MB991827 to special tool MB991824
and the personal computer.4. Connect special tool MB991910 to
special tool MB991824.5. Connect special tool MB991910 to the data
link connector.6. Turn the power switch of special tool MB991824 to
the "ON"
position.NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.
7. Start the M.U.T.-III system on the personal computer.NOTE:
Disconnecting scan tool MB991958 is the reverse of the connecting
sequence, making sure that the ignition switch is at the "LOCK"
(OFF) position.
HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODESRequired Special
Tools:
MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824:Vehicle
Communication Interface(V.C.I.) MB991827:M.U.T.-III USB Cable
MB991910:M.U.T.-III Main Harness A
NOTE: If the battery voltage is low, diagnostic trouble codes
will not be set. Check the battery if scan tool MB991958 does not
display.1. Connect scan tool MB991958 to the data link connector.2.
Turn the ignition switch to the "ON" position.3. Select "System
select" from the start-up screen.4. Select "From 2006 MY" of "Model
Year." When the "Vehicle
Information" is displayed, check the contents.5. Select "SRS-AIR
BAG" from "System List," and press the
"OK" button.NOTE: When the "Loading Option Setup" list is
displayed, check the applicable item.
6. Select "Diagnostic Trouble Code" to read the DTC.7. If a DTC
is set, it is shown.8. Choose "Erase DTCs" to erase the DTC.
HOW TO DIAGNOSE THE CAN BUS LINESRequired Special Tools:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
ACA00016MB991827
MB991824MB991910
AB
Data link connectorTSB Revision
MB991824: Vehicles Communication Interface (V.C.I.) MB991827:
M.U.T.-III USB Cable
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-29
MB991910: M.U.T.-III Main Harness A (Vehicles with CAN
communication system)
1. Connect scan tool MB991958 to the data link connector.2. Turn
the ignition switch to the "ON" position.3. Select "CAN bus
diagnosis" from the start-up screen.4. When the vehicle information
is displayed, confirm that it
matches the vehicle being diagnosed. If they match, go to Step
8. If not, go to Step 5.
5. Select the "view vehicle information" button.6. Enter the
vehicle information and select the "OK" button.7. When the vehicle
information is displayed, confirm again
that it matches the vehicle being diagnosed. If they match, go
to Step 8. If not, go to Step 5.
8. Select the "OK" button.9. When the optional equipment screen
is displayed, choose
the one which the vehicle is fitted with, and then select the
"OK" button.
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the scan tool
(GROUP 00, How to Cope with Intermittent Malfunction P.00-15)..
When detecting fault and storing the DTC, the ECU connected to
CAN bus line obtains the data before the determination of the DTC
and the data when the DTC is determined, and then stores the ECU
status of that time. By analyzing each data from scan tool, the
troubleshooting can be performed more effi-ciently. The displayed
items are as the table below.DISPLAY ITEM LIST
NOTE: *: If a failure occurs to both the ASC-ECU and ETACS-ECU,
0000 mile or FFFF mile is displayed on the scan tool MB991958.
Item No. Item name Data item Unit01 Odometer Total driving
distance after the diagnostic trouble
code is generatedmile*
02 Ignition cycle Number of times the ignition switch is turned
"ON" or "LOCK (OFF)" after the past failure transition
Number of counts is displayed.
04 Accumulated minute Cumulative time for current malfunction of
diagnostic trouble code
minTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-30
SRS WARNING LIGHT CHECKM1524004301353
1. Check that the SRS warning light illuminates when the
ignition switch is in the "ON" position.
2. Check that it illuminates for approximately seven seconds and
then goes out.
3. If not, check for DTC.
PASSENGER'S SEAT BELT WARNING LIGHT CHECK
M1524026200157When an adult on the front passenger's seat wears
the seat belt with the ignition switch "ON," confirm that the
passenger's seat belt warning light goes out.The light comes on
when a person sits on the front passenger seat but does not fasten
the seat belt.
PASSENGER'S AIR BAG OFF INDICATOR LIGHT CHECK
M1524026300262.
SYSTEM CHECKCheck that the passengers air bag OFF indicator
light illumi-nates when the ignition switch is in the "ON"
position.Check that it illuminates for approximately seven seconds
and then goes out.In the following situations, the indicator will
stay on to show that the passengers (front) air bag is not
operational.
The occupant classification-ECU and weight sensor sense 66
pounds (30 kg) on the front passenger seat.
The front passengers seat is not occupied.
.
AC905530
SRS warning light
AB
ACA03521AB
Passenger's seat belt warning light
AC905531
Passenger's air bag OFF indicator light
ACTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-31
ILLUMINATION CHECK1. Remove the instrument panel assembly
center.2. Connect the positive battery terminal with the center
panel
unit connector terminal No. 12. Then, check if the passengers
air bag OFF indicator light is illuminated when the negative
battery terminal and the center panel unit connector terminal No.
14 are connected.
3. If the passengers air bag OFF indicator light is illuminated,
it is judged good.
ACA00007
Instrument panel assembly center
AD
Center panel unit connectorTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-32
CHECK CHART FOR DIAGNOSIS CODESM1524003302416
CAUTIONDuring diagnosis, a DTC code associated with another
system may be set when the ignition switch is turned on with
connector(s) disconnected. After completing the repair, confirm all
systems for DTC code(s). If DTC code(s) are set, erase them
all.Inspect according to the inspection chart that is appropriate
for the DTC.
Code No. Diagnostic item Reference page
B1400*2 Driver's Air Bag Module (1st squib) System (Short
Circuit Between Squib Circuit Terminals)
P.52B-38
B1401*2 Driver's Air Bag Module (1st squib) System (Squib
Circuit Open)
P.52B-45
B1402*2 Driver's Air Bag Module (1st squib) System (Shorted to
Squib Circuit Ground)
P.52B-51
B1403*2 Driver's Air Bag Module (1st squib) System (Shorted to
Squib Circuit Power Supply)
P.52B-57
B1404*4 Driver's Air Bag Module (1st Squib Ignition Drive
Circuit) System Detected Short Circuit
P.52B-63
B1405*4 Driver's Air Bag Module (1st Squib Ignition Drive
Circuit) System Detected Open Circuit
P.52B-63
B1406*4 Malfunction of G-sensor inside Front Impact Sensor (RH)
P.52B-66
B1407*2 Front Impact Sensor (RH) Voltage Error P.52B-68
B1408*2 Front Impact Sensor (RH) Communication Error
P.52B-71
B1409*2 Front Impact Sensor (RH) Communication Impossible
P.52B-71
B1410*2 Passenger's (Front) Air Bag Module (1st squib) System
(Short Circuit Between Squib Circuit Terminals)
P.52B-74
B1411*2 Passenger's (Front) Air Bag Module (1st squib) System
(Squib Circuit Open)
P.52B-80
B1412*2 Passenger's (Front) Air Bag Module (1st squib) System
(Shorted to Squib Circuit Ground)
P.52B-85
B1413*2 Passenger's (Front) Air Bag Module (1st squib) System
(Shorted to Squib Circuit Power Supply)
P.52B-90
B1414*4 Passengers (Front) Air Bag Module (1st Squib Ignition
Drive Circuit) System Detected Short Circuit
P.52B-63
B1415*4 Passengers (Front) Air Bag Module (1st Squib Ignition
Drive Circuit) System Detected Open Circuit
P.52B-63
B1416*4 Malfunction of G-sensor inside Front Impact Sensor (LH)
P.52B-66
B1417*2 Front Impact Sensor (LH) Voltage Error P.52B-96
B1418*2 Front Impact Sensor (LH) Communication Error
P.52B-99
B1419*2 Front Impact Sensor (LH) Communication Impossible
P.52B-99
B1420*2 Side-airbag Module (RH) (Squib) System (Short Circuit
between Squib Circuit Terminals)
P.52B-102
B1421*2 Side-airbag Module (RH) (Squib) System (Squib Circuit
Open)
P.52B-107TSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-33
B1422*2 Side-airbag Module (RH) (Squib) System (Shorted to Squib
Circuit Ground)
P.52B-112
B1423*2 Side-airbag Module (RH) (Squib) System (Shorted to Squib
Circuit Power Supply)
P.52B-116
B1424*4 Side-airbag Module (RH) (Squib) System Detected Short
Circuit
P.52B-63
B1425*4 Side-airbag Module (RH) (Squib) System Detected Open
Circuit
P.52B-63
B1426*4 Malfunction of G-sensor Inside Side Impact Sensor
(Front: RH)
P.52B-120
B1427*2 Side Impact Sensor (Front: RH) Voltage Error
P.52B-122
B1428*2 Side Impact sensor (Front: RH) Communication Error
P.52B-124
B1429*2 Side Impact sensor (Front: RH) Communication impossible
P.52B-124
B1430*2 Side-airbag Module (LH) (Squib) System (Short Circuit
between Squib Circuit Terminals)
P.52B-128
B1431*2 Side-airbag Module (LH) (Squib) System (Squib Circuit
Open)
P.52B-133
B1432*2 Side-airbag Module (LH) (Squib) System (Shorted to Squib
Circuit Ground)
P.52B-138
B1433*2 Side-airbag Module (LH) (Squib) System (Shorted to Squib
Circuit Power Supply)
P.52B-142
B1434*4 Side-airbag Module (LH) (Squib) System Fault 3 for
Ignition Drive Circuit
P.52B-63
B1435*4 Side-airbag Module (LH) (Squib) System Fault 4 for
Ignition Drive Circuit
P.52B-63
B1436*4 Malfunction of G-sensor Inside Side Impact Sensor
(Front: LH)
P.52B-120
B1437*2 Side Impact Sensor (Front: LH) Voltage Error
P.52B-146
B1438*2 Side Impact Sensor (Front: LH) Communication Error
P.52B-149
B1439*2 Side Impact Sensor (Front: LH) Communication Impossible
P.52B-149
B1440*2 Curtain Air Bag Module (RH) (Squib) System (Short
Circuit between Squib Circuit Terminals)
P.52B-152
B1441*2 Curtain Air Bag Module (RH) (Squib) System (Squib
Circuit Open
P.52B-156
B1442*2 Curtain Air Bag Module (RH) (Squib) System (Shorted to
Squib Circuit Ground)
P.52B-161
B1443*2 Curtain Air Bag Module (RH) (Squib) System (Shorted to
Squib Circuit Power Supply))
P.52B-165
B1444*4 Curtain Air Bag Module (RH) (Squib) System Detected
Short Circuit
P.52B-63
B1445*4 Curtain Air Bag Module (RH) (Squib) System Detected Open
Circuit
P.52B-63
*4 Side Impact Sensor (Rear: RH) System for Fault
Code No. Diagnostic item Reference pageTSB Revision
B1446 P.52B-169
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-34
B1447*2 Side Impact Sensor (Rear: RH) Power Supply Circuit
System
P.52B-171
B1448*2 Side Impact Sensor (Rear: RH) (Squib) for Power Supply
Circuit
P.52B-173
B1449*2 Side Impact Sensor (Rear: RH) (Squib) for Communication
System
P.52B-173
B1450*2 Curtain Air Bag Module (LH) (Squib) System (Short
Circuit between Squib Circuit Terminals)
P.52B-176
B1451*2 Curtain Air Bag Module (LH) (Squib) System (Squib
Circuit Open)
P.52B-180
B1452*2 Curtain Air Bag Module (LH) (Squib) System (Shorted to
Squib Circuit Ground)
P.52B-185
B1453*2 Curtain Air bag Module (LH) (Squib) System (Shorted to
Squib Circuit Power Supply)
P.52B-189
B1454*4 Curtain Air Bag Module (LH) (Squib) System Detected
Short Circuit
P.52B-63
B1455*4 Curtain Air Bag Module (LH) (Squib) System Detected Open
Circuit
P.52B-63
B1456*4 Side Impact Sensor (Rear: LH) System for Fault
P.52B-169
B1457*2 Side Impact Sensor (Rear: LH) Power Supply Circuit
System
P.52B-193
B1458*2 Side Impact Sensor (Rear: LH) (Squib) for Power Supply
Circuit
P.52B-196
B14592 Side Impact Sensor (Rear: LH) (Squib) for Communication
System
P.52B-196
B1466*4 Analog G-Sensor System in the SRS-ECU P.52B-63
B1467*4 Safing G-Sensor Open Circuit P.52B-63
B1468*4 Safing G-Sensor Short Circuit P.52B-63
B1469*4 Safing G-Sensor for Side Air Bag Faults P.52B-63
B1476*3 Open Circuit to IG1 Power Supply (Fuse No.12 Circuit)
P.52B-199
B1477*3 Open Circuit to IG1 Power Supply (Fuse No.18 Circuit)
P.52B-199
B1478*4 SRS-ECU Capacitor Circuit Voltage too High P.52B-63
B1479*4 SRS-ECU Capacitor Circuit Voltage too Low P.52B-63
B1480*2 Driver's Air Bag Module (2nd squib) System (Short
Circuit Between Squib Circuit Terminals)
P.52B-38
B1481*2 Driver's Air Bag Module (2nd squib) System (Squib
Circuit Open)
P.52B-45
B1482*2 Driver's Air Bag Module (2nd squib) System (Shorted to
Squib Circuit Ground)
P.52B-51
B1483*2 Driver's Air Bag Module (2nd squib) System (Shorted to
Squib Circuit Power Supply)
P.52B-57
*4 Driver's Air Bag Module (2nd Squib Ignition Drive
Circuit)
Code No. Diagnostic item Reference pageTSB Revision
B1484System Detected Short Circuit
P.52B-63
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-35
B1485*4 Driver's Air Bag Module (2nd Squib Ignition Drive
Circuit) System Detected Open Circuit
P.52B-63
B1488*4 Passengers Air Bag OFF Indicator Light (Short Circuit
between Circuit Terminal)
P.52B-204
B1489*2 Passengers Air Bag OFF Indicator Light (Open Circuit)
P.52B-207
B1490*2 Passenger's (Front) Air Bag Module (2nd squib) System
(Short Circuit Between Squib Circuit Terminals)
P.52B-74
B1491*2 Passenger's (Front) Air Bag Module (2nd squib) System
(Squib Circuit Open)
P.52B-80
B1492*2 Passenger's (Front) Air Bag Module (2nd squib) System
(Shorted to Squib Circuit Ground)
P.52B-85
B1493*2 Passenger's (Front) Air Bag Module (2nd squib) System
(Shorted to Squib Circuit Power Supply)
P.52B-90
B1494*4 Passengers (Front) Air Bag Module (2nd Squib Ignition
Drive Circuit) System Detected Short Circuit
P.52B-63
B1495*4 Passengers (Front) Air Bag Module (2nd Squib Ignition
Drive Circuit) System Detected Open Circuit
P.52B-63
B1496*4 SRS-ECU Non-Volatile Memory (EEPROM*1) P.52B-63
B1497*4 SRS-ECU Application Specific Integrated Circuit (for
frontal activation)
P.52B-63
B1498*4 SRS-ECU ROM or RAM P.52B-63
B1499*4 Air Bag Deployment Determined by SRS-ECU P.52B-210
B1527*2 Seat Belt Switch (Drivers side) Circuit Open
P.52B-211
B1528*2 Seat Belt Switch (Drivers side) Circuit (Ground Side)
Shorted
P.52B-211
B1537*2 Seat Belt Switch (Passengers side) Circuit Open
P.52B-215
B1538*2 Seat Belt Switch (Passengers side) Circuit (Ground Side)
Shorted
P.52B-215
B1547*4 Passengers Air Bag Cut Off Activating Circuit
P.52B-63
B1556*2 Drivers Seat Slide Sensor Malfunction (Occupant
Classification-ECU)
P.52B-219
B1557*4 SRS-ECU Application Specific Integrated Circuit
P.52B-63
B1558*2 OCM (Occupant Classification-ECU) DTC Present
P.52B-220
B1573*5 Passengers Air Bag Cut Off Switch Circuit (Power Supply
side) Shorted
-
B1588*4 SRS-ECU Backup Capacitor System (Up converter unit)
P.52B-63
B1589*4 SRS-ECU Backup Capacitor System (Down converter unit)
P.52B-63
B1590*4 SRS-ECU Backup Capacitor System (capacitance big)
P.52B-63
B1591*4 SRS-ECU Backup Capacitor System (capacitance small)
P.52B-63
B1594*4 SRS-ECU Safing G-sensor Malfunction (For Side Collision)
P.52B-63
Code No. Diagnostic item Reference pageTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-36
B1603*2 Driver's Seat belt Pre-tensioner (Squib) System (Short
Circuit Between Squib Circuit Terminals)
P.52B-221
B1604*2 Driver's Seat belt Pre-tensioner (Squib) System (Squib
Circuit Open)
P.52B-227
B1605*2 Driver's Seat belt Pre-tensioner (Squib) System (Shorted
to Squib Circuit Ground)
P.52B-232
B1606*2 Driver's Seat belt Pre-tensioner (Squib) System (Shorted
to Squib Circuit Power Supply))
P.52B-237
B1607*4 Driver's Seat belt Pre-tensioner (Squib Ignition Drive
Circuit) System Detected Short Circuit
P.52B-63
B1608*4 Driver's Seat belt Pre-tensioner (Squib Ignition Drive
Circuit) System Detected Open Circuit
P.52B-63
B1609*2 Front Passenger's Seat belt Pre-tensioner (Squib) System
(Short Circuit between Squib Circuit Terminals
P.52B-241
B1C49*2 Front Passenger's Seat belt Pre-tensioner (Squib) System
(Squib Circuit Open)
P.52B-246
B1C47*2 Front Passenger's Seat belt Pre-tensioner (squib) system
(shorted to squib circuit Ground)
P.52B-251
B1612*2 Front Passenger's Seat belt Pre-tensioner (Squib) System
(Shorted to Squib Circuit Power Supply
P.52B-255
B1613*4 Front Passenger's Seat belt Pre-tensioner (Squib
Ignition Drive Circuit) System Detected Short Circuit
P.52B-63
B1614*4 Front Passenger's Seat belt Pre-tensioner (Squib
Ignition Drive Circuit) System Detected Open Circuit
P.52B-63
B1615*4 SRS-ECU Safing G-sensor (for front air bag electronic
safing sensor failure)
P.52B-63
B1616*4 SRS-ECU Safing G-sensor (for front air bag electronic
safing circuit failure)
P.52B-63
B1617*4 Roll Over Sensor Malfunction P.52B-259
B1618*4 SRS-ECU Safing G-sensor (Z axis low G-sensor failure)
P.52B-63
B1631*2 Driver's Knee Air Bag (Squib) System (Short Circuit
Between Squib Circuit Terminals)
P.52B-261
B1632*2 Driver's Knee Air Bag (Squib) System (Squib Circuit
Open) P.52B-265
B1633*2 Driver's Knee Air Bag (Squib) System (Shorted To Squib
Circuit Ground)
P.52B-261
B1634*2 Driver's Knee Air Bag (Squib) System (Shorted To Squib
Circuit Power Supply)
P.52B-273
B1635*4 Driver's Knee Air Bag Module (Squib Ignition Drive
Circuit) System Detected Short Circuit
P.52B-63
B1636*4 Driver's Knee Air Bag Module (Squib Ignition Drive
Circuit) System Detected Open Circuit
P.52B-63
B1699*4 SRS-ECU collective deployment P.52B-277
B2206 Vin error/mismatch P.52B-277
Code No. Diagnostic item Reference pageTSB Revision
B222C Coding Data not Written P.52B-278
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-37
NOTE: .
*1: Electrically Erasable Programmable ROM
*2: This DTC will remain in memory and the SRS warning light
will be switched on even if the system returns to normal
condition.
*3: This DTC will remain in memory and the SRS warning light
will be switched off when the system returns to normal
condition.
*4: This DTC cannot be erased by "Erase DTC" function.
*5: This DTC is also set on vehicles without passengers air bag
cutoff switch.
B223B Defective Coding Data P.52B-278U0019 Bus Off (CAN-B)
P.52B-278U0141 ETACS CAN Timeout P.52B-279U0154 Occupant
classification-ECU CAN Timeout P.52B-281U0155 Combination meter CAN
Timeout P.52B-282U0164 A/C -ECU CAN Timeout P.52B-284U0168 KOS/WCM
CAN Timeout P.52B-285U0184 Audio CAN Timeout P.52B-286U0195
Satellite radio tuner CAN Timeout P.52B-288U0245 MMCS CAN Timeout
P.52B-289U1000 OSS CAN Timeout P.52B-290
Code No. Diagnostic item Reference pageTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-38
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC B1400: Driver's Air Bag Module (1st squib) System (Short
Circuit Between Squib Circuit Terminals) DTC B1480: Driver's Air
Bag Module (2nd squib) System (Short Circuit Between Squib Circuit
Terminals)
ACA02863
SRS-ECU
CLOCKSPRING
Drivers's Air Bag Module (Squib) Circuit
*: CONNECTOR LOCK SWITCH CONNECTOR COUPLED: ON CONNECTOR
UNCOUPLED: OFF
NOTE
AB
DRIVER'S AIR BAG MODULE (SQUIB)
C-126 (Y)
Connector: C-126
C-313 (Y)
C-303 (O)
Connectors: C-303, C-313, C-316
C-316 (B)TSB Revision
ACA03077AB ACA03078AB
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-39
CAUTION If DTC B1400 or B1480 is set in the SRS-ECU, always
diag-nose the CAN bus lines.
When DTC B1400 is set in the following diag-nosis, check the 1st
squib circuit. When DTC B1480 is set, check the 2nd squib
circuit.
.
CIRCUIT OPERATION The SRS-ECU judges how severe a collision
is
by detecting signals from the front impact sensors and the front
air bag analog G-sensor. If the impact is over a predetermined
level, the SRS-ECU sends an ignition signal. At this time, if the
front air bag safing G-sensor is on, the SRS air bag will
inflate.
The ignition signal is input to the air bag module via the clock
spring to inflate the air bag.
.
DTC SET CONDITIONS This DTC is set if there is abnormal
resistance
between the input terminals of the driver's air bag module
(squib). The most likely causes for this code to be set are the
followings:
Short circuit in drivers air bag module (squib) or harness
Short circuit in the clock spring.
TROUBLESHOOTING HINTS Improper engaged connector or defective
short
spring* Short circuit in the clock spring Short circuit between
the driver's air bag module
(squib) circuit terminals Damaged connector(s) Malfunction of
the SRS-ECU
NOTE: *: The squib circuit connectors integrate a "short" spring
(which prevents the air bag from deploying unintentionally due to
static electricity by shorting the positive wire to the ground wire
in the squib circuit when the connectors are disconnected).
Therefore, if connector C-126, C-303/C-316 or C-313 is damaged or
improperly engaged, the short spring may not be released when the
connector is con-nected.
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
CAUTIONTo prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-necting or
disconnecting scan tool MB991958.(1) Connect scan tool MB991958.
Refer to "How to connect the
scan tool P.52B-27."(2) Turn the ignition switch to the "ON"
position.(3) Diagnose the CAN bus line.(4) Turn the ignition switch
to the "LOCK" (OFF) position.Q: Is the CAN bus line found to be
normal?
YES : Go to Step 2.NO : Repair the CAN bus line (Refer to GROUP
54C,
Diagnosis P.54C-16).TSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-40
STEP 2. Recheck for diagnostic trouble code.Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to "ON"
position.(3) Check if the DTC is set.(4) Turn the ignition switch
to the "LOCK" (OFF) position.Q: Is the DTC set?
YES : Go to Step 3. NO : There is an intermittent malfunction
such as poor
engaged connector(s) or open circuit (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-15).
STEP 3. Check SRS-ECU connector C-126, drivers air bag module
connector C-303/C-316 and clock spring connector C-313.(1)
Disconnect the negative battery terminal.(2) While pushing the part
"A" indicated in the figure of the
harness side connector, turn the lock lever to the direction of
the arrow to release the lock lever. After disconnecting the C-126
SRS-ECU connector, connect it again.
(3) After disconnecting C-313 clock spring, connect it
again.
(4) Disconnect the C-303/C-316 driver's air bag module connector
using the flat-tipped screwdriver to pull out the locking button to
the direction of the arrow, and connect it again.
(5) Connect the negative battery terminal.(6) Erase the
diagnostic trouble code memory, and check the
diagnostic trouble code.Q: Is DTC B1400 or B1480 set?
YES : Go to Step 4.NO : The procedure is complete. It is assumed
that DTC
B1400 or B1480 set because connector C-126, C-303/C-316 or C-313
was engaged improperly.
AC905015
A
ACLock lever
ACA03543AB
Driver's air bag module harness side connector
Locking button
Flat-tippedscrewdriverTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-41
STEP 4. Check the driver's air bag module.(1) Disconnect the
negative battery terminal.(2) Use the flat-tipped screwdriver to
pull out the locking button
of wiring harness side connector, and release the lock.
(3) Connect special tool MB991865 to special tool
MB991866.CAUTION
Do not insert a probe into the terminal from its front side
directly as the connector contact pressure may be weak-ened.(4)
Insert the resistor harness probe (special tool) as shown.(5)
Connect the negative battery terminal.
CAUTIONAlways DTC B1481 is set when checking DTC B1400. This is
because the second side terminal is isolated when checking it. DTC
B1481 is set but this is not a fault. In addi-tion, always DTC
B1402 is set when checking DTC B1480 because the first side
terminal is isolated. (6) Erase the diagnostic trouble code memory,
and check the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 5.NO : Replace the driver's air bag module.
(Refer to
P.52B-375). Then go to Step 8.
ACA03543AB
Driver's air bag module harness side connector
Locking button
Flat-tippedscrewdriver
ACA03054AB
MB991865 (Dummy resistor: 3 )
MB991866 (Resistor harness)
C-303/C-316 Air bag module connectorTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-42
STEP 5. Check the clock spring.(1) Disconnect the negative
battery terminal.(2) Disconnect the clock spring connector
C-313.(3) Connect special tool dummy resistor (MB991865) to
special
tool resistor harness (MB991866).CAUTION
Do not insert a probe into the terminal from C-313 harness side
connector front side directly, as the connector contact pressure
may be weakened.(4) Insert the resistor harness probe from the back
of C-313
harness side connector (terminal No.3 and 4 or (terminal No.1
and 2 ).
(5) Connect the negative battery terminal.CAUTION
Always DTC B1481 is set when checking DTC B1400. This is because
the second side terminal is isolated when checking it. DTC B1481 is
set but this is not a fault. In addi-tion, always DTC B1401 is set
when checking DTC B1480 because the first side terminal is
isolated. (6) Erase the diagnostic trouble code memory, and check
the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 6.NO : Replace the clock spring. (Refer to
P.52B-375). Then
go to Step 8.
ACA03067
MB991866 (Resistor harness)
Clock springconnector
MB991865 (Dummy resistor: 3 )
ABTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-43
STEP 6. Check the drivers air bag module circuit. Measure the
resistance at SRS-ECU connector C-126.(1) Disconnect the negative
battery terminal.(2) While pushing the part "A" indicated in the
figure of the
harness side connector, turn the lock lever to the direction of
the arrow to release the lock lever, and disconnect the C-126
SRS-ECU connector.
DANGERTo prevent the air bag from deploying unintentionally,
disconnect clock spring connector C-313 to short the squib
circuit.(3) Disconnect clock spring connector C-313.
CAUTIONInsert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm
(0.02 inch)
thick] between terminals 5, 6 or 3, 4 and the short spring to
release the short spring.
AC905015
A
ACLock lever
AC905150AG
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
AC905150AH
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
TSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-44
(5) Check for continuity between C-126 harness side connector
terminals 5 and 6 or 3 and 4 .It should be open circuit.
Q: Is it open circuit? YES : Erase the diagnostic trouble code
memory, and check
the diagnostic trouble code. If DTC B1400 or B1480 set, replace
the SRS-ECU. (Refer to P.52B-371). Go to Step 8.
NO : Go to Step 7.
STEP 7. Check the harness for short circuit between the harness
wire and wire.
SRS-ECU connector C-126 (terminal No.5 and 6) and clock spring
connector C-313 (terminal No.3 and 4) .
SRS-ECU connector C-126 (terminal No.3 and 4) and clock spring
connector C-313 (terminal No.1 and 2) .
Q: the check result normal?YES : Go to Step 8.NO : Repair the
harness wires between SRS-ECU
connector C-126 and clock spring connector C-313. Then go to
Step 8.
STEP 8. Recheck for diagnostic trouble code.Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is DTC B1400 or B1480
set?
YES : Return to Step 1.NO : The procedure is complete.
ACA02867
C-126 Harness side connector (front view)
AB
ACA02867
C-126 Harness side connector (front view)
ACTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-45
DTC B1401: Driver's Air Bag Module (1st squib) System (Squib
Circuit Open) DTC B1481: Driver's Air Bag Module (2nd squib) System
(Squib Circuit Open)
CAUTION If DTC B1401 or B1481 is set in the SRS-ECU, always
diag-nose the CAN main bus line.
nosis, check the 1st squib circuit. When DTC B1481 is set, check
the 2nd squib circuit.
.
ACA02863
SRS-ECU
CLOCKSPRING
Drivers's Air Bag Module (Squib) Circuit
*: CONNECTOR LOCK SWITCH CONNECTOR COUPLED: ON CONNECTOR
UNCOUPLED: OFF
NOTE
AB
DRIVER'S AIR BAG MODULE (SQUIB)
ACA03077
C-126 (Y)
AB
Connector: C-126
ACA03078C-313 (Y)
C-303 (O)
Connectors: C-303, C-313, C-316
AB
C-316 (B)TSB Revision
When DTC B1401 is set in the following diag-
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-46
CIRCUIT OPERATION The SRS-ECU judges how severe a collision
is
by detecting signals from the front impact sensors and the front
air bag analog G-sensor. If the impact is over a predetermined
level, the SRS-ECU sends an ignition signal. At this time, if the
front air bag safing G-sensor is on, the SRS air bag will
inflate.
The ignition signal is input to the air bag module via the clock
spring to inflate the air bag.
.
DTC SET CONDITIONS This DTC is set if there is abnormal
resistance
between the input terminals of the driver's air bag module
(squib). The most likely causes for this code to be set are the
followings:
Open circuit in the driver's air bag module (squib) or
harness
Open circuit in the clock spring Malfunction of connector
contact
.
TROUBLESHOOTING HINTS Open circuit in the clock spring Open
circuit due to improper neutral position of
the clock spring Open circuit in the driver's air bag module
(squib)
circuit Disengaged driver's air bag module (squib) con-
nector Improper connector contact Malfunction of the SRS-ECU
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
CAUTIONTo prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-necting or
disconnecting scan tool MB991958.(1) Connect scan tool MB991958.
Refer to "How to connect the
scan tool P.52B-27."(2) Turn the ignition switch to the "ON"
position.(3) Diagnose the CAN bus line.(4) Turn the ignition switch
to the "LOCK" (OFF) position.Q: Is the CAN bus line found to be
normal?
YES : Go to Step 2.NO : Repair the CAN bus line (Refer to GROUP
54C,
Diagnosis P.54C-16).
STEP 2. Recheck for diagnostic trouble code.Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is the DTC set?
YES : Go to Step 3.NO : There is an intermittent malfunction
such as poor
engaged connector(s) or open circuit (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-15).TSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-47
STEP 3. Check the driver's air bag module.(1) Disconnect the
negative battery terminal.(2) Use the flat-tipped screwdriver to
pull out the locking button
of wiring harness side connector, and release the lock.(3)
Connect special tool MB991865 to special tool MB991866.
CAUTIONDo not insert a test probe into the terminal from its
front side directly, as the connector contact pressure may be
weakened.
(4) Insert the resistor harness probe (special tool) as
shown.(5) Connect the negative battery terminal.
CAUTIONAlways DTC B1481 is set when checking DTC B1401. This is
because the second side terminal is isolated when checking it. DTC
B1481 is set but this is not a fault. In addi-tion, always DTC
B1401 is set when checking DTC B1481 because the first side
terminal is isolated. (6) Erase the diagnostic trouble code memory,
and check the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 4.NO : Replace the driver's air bag module.
(Refer to
P.52B-375). Then go to Step 6.
ACA03543AB
Driver's air bag module harness side connector
Locking button
Flat-tippedscrewdriver
ACA03054AB
MB991865 (Dummy resistor: 3 )
MB991866 (Resistor harness)
C-303/C-316 Air bag module connectorTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-48
STEP 4. Check the clock spring.(1) Disconnect the negative
battery terminal.(2) Disconnect the clock spring connector
C-313.(3) Connect special tool MB991865 to special tool
MB991866.
CAUTIONDo not insert a probe into the terminal from its front
side directly, as the connector contact pressure may be
weak-ened.(4) Insert the resistor harness probe from the back of
C-313
harness side connector (terminal No.3 and 4 or terminal No.1 and
2 ).
(5) Connect the negative battery terminal.CAUTION
Always DTC B1481 is set when checking DTC B1401. This is because
the second side terminal is isolated when checking it. DTC B1481 is
set but this is not a fault. In addi-tion, always DTC B1401 is set
when checking DTC B1481 because the first side terminal is
isolated. (6) Erase the diagnostic trouble code memory, and check
the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 5.NO : Replace the clock spring. (Refer to
P.52B-375). Then
go to Step 6.
ACA03067
MB991866 (Resistor harness)
Clock springconnector
MB991865 (Dummy resistor: 3 )
ABTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-49
STEP 5. Check the harness for open circuit between the SRS-ECU
connector C-126 and the clock spring connector C-313.(1) Disconnect
the negative battery terminal.(2) While pushing the part "A"
indicated in the figure of the
harness side connector, turn the lock lever to the direction of
the arrow to release the lock lever, and disconnect the C-126
SRS-ECU connector.
DANGERTo prevent the air bag from deploying unintentionally,
disconnect the clock spring connector C-313 to short the squib
circuit.
CAUTIONInsert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.(3) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm
(0.02 inch)
thick] between terminals 5, 6 or 3, 4 and the short spring to
release the short spring.
AC905015
A
ACLock lever
AC905150AG
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
AC905150AH
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
TSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-50
CAUTIONDo not insert a probe into the terminal from C-313
harness side connector front side directly, as the connector
contact pressure may be weakened.(4) Check for continuity between
the following terminals. It
should be less than 2 ohms.
SRS-ECU connector C-126 (terminal No.5) and the
clock spring connector C-313 (terminal No.3) SRS-ECU connector
C-126 (terminal No.6) and the
clock spring connector C-313 (terminal No.4)
SRS-ECU connector C-126 (terminal No.3) and the
clock spring connector C-313 (terminal No.1) SRS-ECU connector
C-126 (terminal No.4) and the
clock spring connector C-313 (terminal No.2)Q: Does continuity
exist?
YES : Erase the diagnostic trouble code memory, and check the
diagnostic trouble code. If DTC B1401 or B1481 set, replace the
SRS-ECU. (Refer to P.52B-371). Then go to Step 6.
NO : Repair the harness wires between SRS-ECU connector C-126
and clock spring connector C-313 Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is DTC B1401 or B1481
set?
YES : Return to Step 1.NO : The procedure is complete.
ACA02867
C-313 Harness sideconnector (rear view)
C-126 Harness side connector (front view)
AD
ACA02867
C-313 Harness sideconnector (rear view)
C-126 Harness side connector (front view)
AETSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-51
DTC B1402: Driver's Air Bag Module (1st Squib) System (Shorted
to Squib Circuit Ground) DTC B1482: Driver's Air Bag Module (2nd
Squib) System (Shorted to Squib Circuit Ground)
CAUTION If DTC B1402 or B1482 is set in the SRS-ECU, always
diag-nose the CAN main bus line.
nosis, check the 1st squib circuit. When DTC B1482 is set, check
the 2nd squib circuit.
.
ACA02863
SRS-ECU
CLOCKSPRING
Drivers's Air Bag Module (Squib) Circuit
*: CONNECTOR LOCK SWITCH CONNECTOR COUPLED: ON CONNECTOR
UNCOUPLED: OFF
NOTE
AB
DRIVER'S AIR BAG MODULE (SQUIB)
ACA03077
C-126 (Y)
AB
Connector: C-126
ACA03078C-313 (Y)
C-303 (O)
Connectors: C-303, C-313, C-316
AB
C-316 (B)TSB Revision
When DTC B1402 is set in the following diag-
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-52
CIRCUIT OPERATION The SRS-ECU judges how severe a collision
is
by detecting signals from the front impact sensors and the front
air bag analog G-sensor. If the impact is over a predetermined
level, the SRS-ECU sends an ignition signal. At this time, if the
front air bag safing G-sensor is on, the SRS air bag will
inflate.
The ignition signal is sent to the air bag module via the clock
spring to inflate the air bag.
.
DTC SET CONDITIONSThis DTC is set if there is abnormal
resistance between the input terminals of the driver's air bag
module (squib)..
TROUBLESHOOTING HINTS Malfunction of the clock spring Damaged
harness wires and connectors Short to the ground in the driver's
air bag module
(squib) harness Malfunction of the SRS-ECU
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
CAUTIONTo prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-necting or
disconnecting scan tool MB991958.(1) Connect scan tool MB991958.
Refer to "How to connect the
scan tool P.52B-27."(2) Turn the ignition switch to the "ON"
position.(3) Diagnose the CAN bus line.(4) Turn the ignition switch
to the "LOCK" (OFF) position.Q: Is the CAN bus line found to be
normal?
YES : Go to Step 2.NO : Repair the CAN bus line (Refer to GROUP
54C,
Diagnosis P.54C-16).
STEP 2. Recheck for diagnostic trouble code.Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is the DTC set?
YES : Go to Step 3.NO : There is an intermittent malfunction
such as poor
engaged connector(s) or open circuit (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-15).TSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-53
STEP 3. Check the driver's air bag module.(1) Disconnect the
negative battery terminal.(2) Use the flat-tipped screwdriver to
pull out the locking button
of wiring harness side connector, and release the lock.(3)
Connect special tool MB991865 to special tool MB991866.
CAUTIONDo not insert a probe into the terminal from its front
side directly, as the connector contact pressure may be
weak-ened.
(4) Insert the resistor harness probe (special tool) as
shown.(5) Connect the negative battery terminal.
CAUTIONAlways DTC B1481 is set when checking DTC B1402. This is
because the second side terminal is isolated when checking it, DTC
B1481 is set but this is not a fault. In addi-tion, always DTC
B1401 is set when checking DTC B1482 because the first side
terminal is isolated. (6) Erase the diagnostic trouble code memory,
and check the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 4.NO : Replace the driver's air bag module
(Refer to
P.52B-375). Then go to Step 7.
ACA03543AB
Driver's air bag module harness side connector
Locking button
Flat-tippedscrewdriver
ACA03054AB
MB991865 (Dummy resistor: 3 )
MB991866 (Resistor harness)
C-303/C-316 Air bag module connectorTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-54
STEP 4. Check the clock spring.(1) Disconnect the negative
battery terminal.(2) Disconnect the clock spring connector
C-313.(3) Connect special tool MB991865 to special tool
MB991866.
CAUTIONDo not insert a test probe into the terminal from its
front side directly, as the connector contact pressure may be
weakened.(4) Insert the resistor harness probe from the back of
C-313
harness side connector (terminal No.3 and 4 or (terminal No.1
and 2 ).
(5) Connect the negative battery terminal.CAUTION
Always DTC B1481 is set when checking DTC B1402. This is because
the second side terminal is isolated when checking it, DTC B1481 is
set but this is not a fault. In addi-tion, always DTC B1401 is set
when checking DTC B1482 because the first side terminal is
isolated. (6) Erase the diagnostic trouble code memory, and check
the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 5.NO : Replace the clock spring. (Refer to
P.52B-375). Then
go to Step 7.
ACA03067
MB991866 (Resistor harness)
Clock springconnector
MB991865 (Dummy resistor: 3 )
ABTSB Revision
-
SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-55
STEP 5. Check the drivers air bag module circuit. Measure the
resistance at the SRS-ECU connector C-126.(1) While pushing the
part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction of
the arrow to release the lock lever, and disconnect the C-126
SRS-ECU connector.
DANGERTo prevent the air bag from deploying unintentionally,
disconnect the clock spring connector C-313 to short the squib
circuit.(2) Disconnect the clock spring connector C-313.
CAUTIONInsert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.(3) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm
(0.02 inch)
thick] between terminals 5, 6 or 9, 10 and the short spring to
release the short spring.
AC905015
A
ACLock lever
AC905150AG
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
AC905150AH
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
TSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-56
(4) Check for continuity between C-126 harness side connector
terminals 5 and 6 or 3 and 4 and body ground.It should be open
circuit.
Q: Is it open circuit?YES : Erase the diagnostic trouble code
memory, and check
the diagnostic trouble code. If DTC B1402 or B1482 sets, replace
the SRS-ECU (Refer to P.52B-371). Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the harness for short circuit to ground between
the following connector.
SRS-ECU connector C-126 (terminal No.5 and 6) and clock spring
connector C-313 (terminal No.3 and 4) .
SRS-ECU connector C-126 (terminal No.3 and 4) and clock spring
connector C-313 (terminal No.1 and 2) .
Q: Is the check result normal?YES : Go to Step 7.NO : Repair the
harness wires between SRS-ECU
connector C-126 and clock spring connector C-313. Then go to
Step 7.
STEP 7. Recheck for diagnostic trouble code. Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is DTC B1402 or B1482
set?
YES : Return to Step 1.NO : The procedure is complete.
ACA02867
C-126 Harness side connector (front view)
AF
ACA02867
C-126 Harness side connector (front view)
AGTSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-57
DTC B1403: Driver's Air bag Module (1st squib) System (Shorted
to Squib Circuit Power Supply) DTC B1483: Driver's Air bag Module
(2nd squib) System (Shorted to Squib Circuit Power Supply
CAUTION If DTC B1403 or B1483 is set in the SRS-ECU, always
diag-nose the CAN main bus line.
nosis, check the 1st squib circuit. When DTC B1483 is set, check
the 2nd squib circuit.
.
ACA02863
SRS-ECU
CLOCKSPRING
Drivers's Air Bag Module (Squib) Circuit
*: CONNECTOR LOCK SWITCH CONNECTOR COUPLED: ON CONNECTOR
UNCOUPLED: OFF
NOTE
AB
DRIVER'S AIR BAG MODULE (SQUIB)
ACA03077
C-126 (Y)
AB
Connector: C-126
ACA03078C-313 (Y)
C-303 (O)
Connectors: C-303, C-313, C-316
AB
C-316 (B)TSB Revision
When DTC B1403 is set in the following diag-
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-58
CIRCUIT OPERATION The SRS-ECU judges how severe a collision
is
by detecting signals from the front impact sensors and the front
air bag analog G-sensor. If the impact is over a predetermined
level, the SRS-ECU sends an ignition signal. At this time, if the
front air bag safing G-sensor is on, the SRS air bag will
inflate.
The ignition signal is input to the air bag module via the clock
spring to inflate the air bag.
.
DTC SET CONDITIONSThis DTC is set if there is abnormal
resistance between the input terminals of the driver's air bag
module (squib)..
TROUBLESHOOTING HINTS Malfunction of the clock spring Damaged
harness wires and connectors Short to the power supply in the
driver's air bag
module (squib) harness Malfunction of the SRS-ECU
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
CAUTIONTo prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-necting or
disconnecting scan tool MB991958.(1) Connect scan tool MB991958.
Refer to "How to connect the
scan tool P.52B-27."(2) Turn the ignition switch to the "ON"
position.(3) Diagnose the CAN bus line.(4) Turn the ignition switch
to the "LOCK" (OFF) position.Q: Is the CAN bus line found to be
normal?
YES : Go to Step 2.NO : Repair the CAN bus line (Refer to GROUP
54C,
Diagnosis P.54C-16).
STEP 2. Recheck for diagnostic trouble code.Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is the DTC set?
YES : Go to Step 3.NO : There is an intermittent malfunction
such as poor
engaged connector(s) or open circuit (Refer to GROUP 00, How to
Cope with Intermittent Malfunction P.00-15).TSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-59
STEP 3. Check the driver's air bag module.(1) Disconnect the
negative battery terminal.(2) Use the flat-tipped screwdriver to
pull out the locking button
of wiring harness side connector, and release the lock.(3)
Connect special tool MB991865 to special tool MB991866.
CAUTIONDo not insert a probe into the terminal from its front
side directly, as the connector contact pressure may be
weak-ened.
(4) Insert the resistor harness probe (special tool) as
shown.(5) Connect the negative battery terminal.
CAUTIONAlways DTC B1481 is set when checking DTC B1403. This is
because the second side terminal is isolated when checking it. DTC
B1481 is set but this is not a fault. In addi-tion, always DTC
B1401 is set when checking DTC B1483 because the first side
terminal is isolated. (6) Erase the diagnostic trouble code memory,
and check the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 4.NO : Replace the drivers air bag module.
(Refer to
P.52B-375). Then go to Step 7.
ACA03543AB
Driver's air bag module harness side connector
Locking button
Flat-tippedscrewdriver
ACA03054AB
MB991865 (Dummy resistor: 3 )
MB991866 (Resistor harness)
C-303/C-316 Air bag module connectorTSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-60
STEP 4. Check the clock spring.(1) Disconnect the negative
battery terminal.(2) Disconnect the clock spring connector
C-313.(3) Connect special tool MB991865 to special tool
MB991866.
CAUTIONDo not insert a test probe into the terminal from its
front side directly, as the connector contact pressure may be
weakened.(4) Insert the resistor harness probe from the back of
C-313
harness side connector terminals Nos. 3 and 4 or terminal No. 2
and 1 ).
(5) Connect the negative battery terminal.CAUTION
Always DTC B1B06 is set when checking DTC B1403. This is because
the second side terminal is isolated when checking it. DTC B1B06 is
set but this is not a fault. In addition, always DTC B1B02 is set
when checking DTC B1483 because the first side terminal is
isolated. (6) Erase the diagnostic trouble code memory, and check
the
diagnostic trouble code.Q: Is the checked DTC set?
YES : Go to Step 5.NO : Replace the clock spring (Refer to
P.52B-375). Then
go to Step 7.
ACA03067
MB991866 (Resistor harness)
Clock springconnector
MB991865 (Dummy resistor: 3 )
ABTSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-61
STEP 5. Check the drivers air bag module circuit. Measure the
voltage at the SRS-ECU connector C-126.(1) Disconnect the negative
battery terminal.(2) While pushing the part "A" indicated in the
figure of the
harness side connector, turn the lock lever to the direction of
the arrow to release the lock lever, and disconnect the C-126
SRS-ECU connector.
DANGERTo prevent the air bag from deploying unintentionally,
disconnect the clock spring connector C-313 to short the squib
circuit.(3) Disconnect the clock spring connector C-313.
CAUTIONInsert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm
(0.02 inch)
thick] between terminals 5, 6 or 3, 4 and the short spring to
release the short spring.
(5) Connect the negative battery terminal.(6) Ignition switch:
ON.
AC905015
A
ACLock lever
AC905150AG
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
AC905150AH
A
A
C-126 Harness sideconnector (front view)
SectionA - A
Cable tie
Short spring4 mm or more
Terminal
TSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM
(SRS)52B-62
(7) Measure the voltage between C-126 harness side connector
terminals 5 and 6 or 3 and 4 and body ground.Voltage should measure
1 volt or less.
Q: Is the measured voltage within the specified range?YES :
Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1403 or B1483 sets, replace
the SRS-ECU. (Refer to P.52B-371). Then go to Step 7.
NO : Go to Step 6.
STEP 6. Check the harness for short circuit to power supply
between the following connector.
SRS-ECU connector C-126 (terminal No.5 and 6) and clock spring
connector C-313 (terminal No.3 and 4) .
SRS-ECU connector C-126 (terminal No.3 and 4) and clock spring
connector C-313 (terminal No.1 and 2) .
Q: Is the check result normal?YES : Go to Step 7.NO : Repair the
harness wires between SRS-ECU
connector C-126 and clock spring connector C-313. Then go to
Step 7.
STEP 7. Recheck for diagnostic trouble code. Check again if the
DTC is set.(1) Erase the DTC.(2) Turn the ignition switch to the
"ON" position.(3) Check if the DTC is set.(4) Turn the ignition
switch to the "LOCK" (OFF) position.Q: Is DTC B1403 or B1483
set?
YES : Return to Step 1.NO : The procedure is complete.
ACA02874
C-126 Harness side connector (front view)
AB
ACA02874
C-126 Harness side connector (front view)
AC
TSB Revision
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SRS AIR BAG DIAGNOSISSUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-63
DTC B1404: Driver's Air Bag Module (1st Squib Ignition Drive
Circuit) System Detected Short Circuit DTC B1405: Driver's Air Bag
Module (1st Squib Ignition Drive Circuit) System Detected Open
Circuit DTC B1414: Passengers (Front) Air Bag Module (1st Squib
Ignition Drive Circuit) System Detected Short Circuit DTC B1415:
Passengers (Front) Air Bag Module (1st Squib Ignition Drive
Circuit) System Detected Open Circuit DTC B1424: Side-Airbag Module
(RH) (Squib) System Detected Short Circuit DTC B1425: Side-Airbag
Module (RH) (Squib) System Detected Open Circuit DTC B1434:
Side-Airbag Module (LH) (Squib) System Fault 3 for Ignition Drive
Circuit DTC B1435: Side-Airbag Module (LH) (Squib) System Fault 4
for Ignition Drive Circuit DTC B1444: Curtain Air Bag Module (RH)
(Squib) System Detected Short Circuit DTC B1445: Curtain Air Bag
Module(RH) (Squib) System Detected Open Circuit DTC B1454: Curtain
Air Bag Module (LH) (Squib) System Detected Short Circuit DTC
B1455: Curtain Air Bag Module(LH) (Squib) System Detected Open
Circuit DTC B1466: Analog G-Sensor System in the SRS-ECU DTC B1467:
Safing G-Sensor Open Circuit DTC B1468: Safing G-Sensor Short
Circuit DTC B1469: Safing G-Sensor for Side Air Bag Faults DTC
B1478: SRS-ECU Capacitor Circuit Voltage too High DTC B1479:
SRS-ECU Capacitor Circuit Voltage too Low DTC B1484: Driver's Air
Bag Module (2nd Squib Ignition Drive Circuit) System Detected Short
Circuit DTC B1485: Driver's Air Bag Module (2nd Squib Ignition
Drive Circuit) System Detected Open Circuit DTC B1494: Passengers
(Front) Air Bag Module (2nd Squib Ignition Drive Circuit) System
Detected Short Circuit DTC B1495: Passengers (Front) Air Bag Module
(2nd Squib