Lgbrk Ae 0108

WORKSHOP MANUALNKR . NPR . NQR

CAB AND CHASSISELECTRICAL

ANTI-LOCK BRAKE SYSTEM(ABS)

SUPPLEMENT

SECTION 8

FOREWORD

This workshop manual supplement contains information of anti-lockbrake system for Medium Duty Steel Tilt Cab Vehicle (NKR NPR NQR).When used with the Medium Duty Truck Workshop Manual (Pub. No.LGBKR-WE-0101), complete service coverage is provided.

Keep this manual in a handy place for ready reference. If properly used,it will enable the technician to serve the owners of ISUZU vehicles.

CAUTION:

These vehicles contain parts dimensioned in the metric system as well asin the customary system. Some fasteners are metric and are very close indimension to familiar customary fasteners in the inch system. It isimportant to note that, during any vehicle maintenance procedures,replacement fasteners must have the same measurements and strengthas those removed, whether metric or customary. (Numbers on the headsof metric bolts and on surfaces of metric nuts indicate their strength.Customary bolts use radial lines for this purpose, while most customarynuts do not have strength markings.) Mismatched or incorrect fastenerscan result in vehicle damage or malfunction, or possibly personal injury.Therefore, fasteners removed from the vehicle should be saved for re-usein the same location whenever possible. Where the fasteners are notsatisfactory for re-use, care should be taken to select a replacement thatmatches the original. For information and assistance, see your AuthorizedIsuzu Medium Duty Vehicle dealer.

CAB AND CHASSIS ELECTRICAL 8-1

CAB AND CHASSIS ELECTRICALService PrecautionCAUTION: When fasteners are removed, always reinstall them at the same location from which they wereremoved. If the fastener needs to be replaced, use the correct part number fastener for that application. Ifthe correct part number fastener is not available, a fastener of equal size and strength (or stronger) may beused. Fasteners that are not reused, and those requiring thread locking compound, will be called out. Thecorrect torque values must be used when installing fasteners that require it. If the above conditions are notfollowed, parts or system damage could result.

CONTENTSPAGE

Anti-lock Brake System...................................... See Anti-lock Brake System (ABS)Workshop Manual (LGBRK-WE-0101)

General Information ........................................... See 1999 MY SECTION 8 Workshop ManualNotes for Working on Electrical Items........... See 1999 MY SECTION 8 Workshop ManualSymbols and Abbreviations............................ See 1999 MY SECTION 8 Workshop Manual

Symbols......................................................... See 1999 MY SECTION 8 Workshop ManualAbbreviations................................................ See 1999 MY SECTION 8 Workshop Manual

Parts for Electrical Circuit .............................. See 1999 MY SECTION 8 Workshop ManualWiring ............................................................ See 1999 MY SECTION 8 Workshop ManualFuse and Fusible Link.................................. See 1999 MY SECTION 8 Workshop ManualRelay.............................................................. See 1999 MY SECTION 8 Workshop ManualDiode ............................................................. See 1999 MY SECTION 8 Workshop ManualConnector...................................................... See 1999 MY SECTION 8 Workshop Manual

Reading the Circuit Diagram .......................... See 1999 MY SECTION 8 Workshop ManualConnector Symbol........................................... See 1999 MY SECTION 8 Workshop ManualJoint Connector ............................................... See 1999 MY SECTION 8 Workshop Manual

Main Data and Specifications............................ See 1999 MY SECTION 8 Workshop ManualBulb Specifications ......................................... See 1999 MY SECTION 8 Workshop Manual

Fuse and Fusible Link Location............................................................................................ 8-3Fuse and Circuit Breaker .................................................................................................... 8-3Fusible Link ......................................................................................................................... 8-4Fuse Block Circuit ............................................................................................................... 8-5Reference Table of Fuse ................................. See 1999 MY SECTION 8 Workshop Manual

8-2 CAB AND CHASSIS ELECTRICAL

Relay Location ........................................................................................................................ 8-7Relay List................................................................................................................................. 8-8Diode Location........................................................................................................................ 8-9

Reference Table of Grounding Point ............. See 1999 MY SECTION 8 Workshop ManualGrounding Point Location .............................. See 1999 MY SECTION 8 Workshop ManualCable Harness Routing ................................... See 1999 MY SECTION 8 Workshop Manual

System Repair..................................................... See 1999 MY SECTION 8 Workshop ManualStart and Charging .......................................... See 1999 MY SECTION 8 Workshop ManualEngine Control Module ................................... See 1999 MY SECTION 8 Workshop ManualEngine Stop System........................................ See 1999 MY SECTION 8 Workshop ManualHeadlight, D.R.L and Cornering Light............ See 1999 MY SECTION 8 Workshop ManualClearance Light, Taillight, License PlateLight, ID Light and Illumination Light ............ See 1999 MY SECTION 8 Workshop ManualTurn Signal Light, Hazard Warning Lightand Stoplight.................................................... See 1999 MY SECTION 8 Workshop ManualHorn and Backup Light ................................... See 1999 MY SECTION 8 Workshop ManualDome Light and Cab Interior Light................. See 1999 MY SECTION 8 Workshop ManualTransmission Control Module (TCM)............. See 1999 MY SECTION 8 Workshop ManualWindshield Wiper and Washer ....................... See 1999 MY SECTION 8 Workshop ManualAudio and Cigarette Lighter ........................... See 1999 MY SECTION 8 Workshop ManualMeter and Warning/Indicator Light ................ See 1999 MY SECTION 8 Workshop ManualHeater, Air Conditioning, Condenser Fanand Ceramic Heater......................................... See 1999 MY SECTION 8 Workshop ManualService Terminal.............................................. See 1999 MY SECTION 8 Workshop Manual

ABS (Anti-lock Brake System)............................................................................................. 8-10Parts Location.................................................................................................................... 8-10Circuit Diagram.................................................................................................................. 8-11Connector List ................................................................................................................... 8-15


Fuse And Fusible Link LocationFuse And Circuit Breaker

FUSE LABEL-FOR 12Volt FUSE LABEL-FOR 24Volt25AF-1 HEATER

15AF-1 HEATER

10AF-21 MARKER LIGHT

10AF-2 AIR CON

F-2 15AF-22 CONDENSER FAN

10AF-3 STARTER

10AF-3 STARTER

15AF-4 CIGAR LIGHTER

15AF-4 CIGAR LIGHTER

10AF-5 HEAD LIGHT (RH)

10AF-5 HEAD LIGHT (RH)

10AF-6 HEAD LIGHT (LH)

10AF-6 HEAD LIGHT (LH)

15AF-7 AUDIO, DOOR LOCK

15AF-7 AUDIO, DOOR LOCK

15AF-8 HAZARD, HORN

15AF-8 HAZARD, HORN

15AF-9 TAIL LIGHT

15AF-9 TAIL LIGHT

10AF-10 FOG LIGHT

10AF-10 STOP LIGHT

15AF-11 WIPER, WASHER

15AF-11 WIPER, WASHER

10AF-12 GAUGE, BACK

10AF-12 GAUGE, BACK

15AF-13 RR. HEATER

10AF-13 ECU (IGN)

15AF-14

FUEL HEATEREXH. BRAKE

10AF-14

FUEL HEATEREXH. BRAKE

10AF-15 HDLP LEVELING

15AF-15 RR. HEATER

25AF-16 POWER WINDOW

15AF-16 POWER WINDOW

10AF-17 STOP LIGHT

10AF-17 ENG. STOP

15AF-18 GENERATOR

10AF-18 HDLP LEVELING

10AF-19 TURN S/LIGNT

10AF-19 TURN S/LIGNT

10AF-20 ENG. STOP

15AF-20 GENERATOR


Fusible Link


Fuse Block Circuit - FOR 12VOLT

25AF-1

FL-2 FL-4

FL-3

FL-1

HEATERF-2

AIR CON.10A

10A

F-3

B-20STARTER

15AF-4CIGAR LIGHTER

10AF-5HEAD LAMP (RH)

10AF-6HEAD LAMP (LH)

15AF-7RADIO,DOOR LOCK

15AF-8HAZARD,HORN

15AF-9TAIL

10AF-10FOG LAMP

15AF-11WIPER,WASHER

10AF-12METER,GAUGE BACK

15AF-13REAR HEATER

15AF-14FUEL HEATER,EXH.BRAKE

10AF-15HEAD LAMP LEVELING

25AF-16POWER WINDOW

10AF-17STOP LAMP

15AF-18GENERATOR

10AF-19TURN

10AF-20ENG.STOP

INDICATION ON LABEL

RELAY ; HEAD LAMP

B-21RELAY ;

HEATER&A/C

B-67SW ; IGNITION

J-13RELAY ; GLOW

GLOW PLUG

to EHCU ;ABS (24)

P-5

B-38RELAY ;

EXH.BRAKE

B-22RELAY ;

TAIL

ACC

ONB

ST

MAIN80A

ABS60A

GLOW60A

KEY SW50A

P-1

P-2

BATTERY

A/C GENERATOR (12V/50A)


Fuse Block Circuit - FOR 24VOLT

15AF-1

FL-2

FL-5

FL-4

FL-3

FL-1

HEATERF-2

10AF-3

B-20STARTER

15AF-4CIGAR LIGHTER

10AF-5HEAD LAMP (RH)

10AF-6HEAD LAMP (LH)

15AF-7RADIO,DOOR LOCK

15AF-8HAZARD,HORN

15AF-9TAIL

10AF-10STOP LAMP

15AF-11WIPER,WASHER

10AF-12METER,GAUGE BACK

10AF-13ECU(IG)

10AF-14FUEL HEATER,EXH.BRAKE

15AF-15REAR HEATER

15AF-16POWER WINDOW

10AF-17ENG.STOP

10AF-18HEAD LAMP LEVELING

10AF-19TURN

15AF-20GENERATOR

INDICATION ON LABEL

RELAY ; HEAD LAMP

B-21RELAY ;

HEATER&A/C

B-67SW ; IGNITION

J-13RELAY ; GLOW

GLOW PLUG

to EHCU ;ABS(24)

CERAMICHEATER

J-14 P-5

RELAY ; CERAMICHEATER

B-38RELAY ;

EXH.BRAKE

ACC

ONB

ST

MAIN60A

CERAMIC HEATER60A

ABS40A

GLOW60A

KEY SW40A

P-1

P-2

BATTERY

P-3

P-4

BATTERYA/C GENERATOR(24V/50A)


Relay Location


Relay ListConnector No. B-19 B-20 B-21 B-22 B-23

Relay name Charge Headlight Heater & A/C Tail Dimmer

Connector No. B-24 B-34 B-35 B-36 B-37Relay name Horn Buzzer cansel ABS. IND Power window A/C thermo

Connector No. B-38 B-261Relay name Exh. Brake Timing

Connector No. J-12 J-13 J-14 J-15 J-16Relay name Starter Glow C/HEATER Eng. warm cut Exh. brake cut

Connector No. J-17 J-18 J-19 J-20Relay name Condenser fan Exh. brake

controlRear fog Marker lamp


Diode Location


ABS (Anti-lock Brake System)Parts Location

H-1

6

B-29

JO

INT

CONN

ECTO

R

J-74

F/R

H SE

NSO

R

H-5

~H

-8

B-66

STO

PLIG

HT S

W(B

RAKE

SW

)

B-1

EART

H ;

FRAM

E (F

R)

B-67

IGNI

TIO

N SW

"A"

B-7

EART

H ;

HEA

DLI

GHT

B/T

B-23

3,B-

234

ECU

(24V)

FUSE

BOX

ASM

F-12

,F-1

4,F-

17 (1

2V)

F-10

,F-1

2,F-

14 (2

4V)

B-35

,B-3

8 R

ELAY

BOX

STAR

TER

SW

J-14

8 R/

RHSE

NSO

R (24

V)J-

149

R/LH

SENS

OR

(24V)

J-78

R/R

H,R/

LHSE

NSO

R (12

V)

J-50

0 AB

S EH

CU

BATT

ERY

B-51

ABS

WAR

NIN

G L

IGHT

(MET

ER)

J-75

F/L

H SE

NSO

R

B-79

ALD

L CO

NNEC

TOR

J-9

EART

H ;

FRAM

E

REL

AY B

OX A

SMJ-

15 (2

4V),J

-16,J-

18 R

ELAY

B-17

,B-1

8,J-

23 D

IODE

FL-1

,FL-

2,FL

-4 F

USIB

LE L

INK

(12V)

(24V)


Circuit Diagram-FOR 12VOLT

ABS60A

P-5

P-2BATTERY

P-1

J-9FRAME-LH (CENTER) 2B 2B 2B

B-7HEADLIGHT BRACKET (LH) 3B 3B3B 3B

78

2B-1

B-29 JOINTCONNECTORFRAME-LH (FRONT) 0.85B

0.85

B

RELAY ; EXH.BRAKE

B-38 5

B-38 4

B-381H-62

B-382

B-31 5B-312

B-31 6B-313

B-31 4B-311

B-51 7B-518

FL-4

MAIN80A

FL-1 EXH.BRAKE15A

F-14

KEY SW50A

FL-2

GAUGEBACK10A

F-12

8B 8W

3R

5W

5W

3W

0.5W/L

0.3B

3W 0.5G/Y

3R

0.5G

0.5LG

SW ; STOP LAMP

B

OFF

ACC

ON

ST

B-672

B-67 3

KEY SW

3W/B

2B/R

0.5L

G/W

0.3B

0.3B 0.3B

0.5B

0.5B

0.5B

/Y0.

5B/G

0.5L

G/R

2B

0.5B

0.3B 0.5B

2B

0.5L

G/B

0.5LG/B 0.5LG/R

0.5BR/B

0.5B

/Y

0.5B/Y

0.5B/Y

0.5L

G/B

0.5L

G/B

0.5L

G/L

0.5LG/R

RELAY ;TAIL

RELAY;CHARGE

J-16

3

J-16

1

J-16

2

J-16

5

H-5

40

J-16

4

STOP LAMP10A

F-17

B-66 2B-661

SW ; NEUTRAL(Neutral=ON)

SW ; EXH.BRAKE

SW ;ENG.WARMING

0.5LG/B

0.5LG/B

0.5B/Y

0.5B/Y

0.3B

0.3B

0.5BR/R

0.5W

B-35

3

B-35

4

B-35

5

B-35

2

J-50

2

J-50

1

J-18

4

J-18

2

3B/Y

METERABS

B-69

5

H-536

B-69

3

J-18

3

J-18

5

H-512 SW ; CLUTCH

B-89 2B-891

B-52 10B-511

IND.LAMP ;EXH.BRAKE

0.5LG/L0.5LG/L

H-8

17

B-18

3

B-18 2B-181

RELAY ;ABS IND.

DIODE

3W/B

H-71

RELAY ;EXH.BRAKECONTROL

0.3B

3B

3B

0.5BR/R

RELAY ;EXH.B/CUT (ABS)

0.3W

/V

0.5L

G/W


2B

J-784

J-783

0.5R

0.5W

0.3W/G

0.3W/B

0.3W/B0.5

B0.

5B

SPEED SENSOR(RR,RH)

J-741

J-742

0.5P

0.5LSPEED SENSOR(FRT,RH)

J-751

J-752

0.5V

0.5R/BSPEED SENSOR(FRT,LH)

0.5B

0.5B

3B

0.5LG/W

J-500 22J-50016 STOP LAMP

EHCU ; ABS

RL 12V

J-500 34

J-782

J-781J-50024 MOTOR +B

RL SIG

J-500 32J-5002 VALVE +B

FL SIG

J-500 33J-50023 MOTOR GND

FL GRD

J-500 10

J-5001 VALVE GND

FR SIG

J-500 11

J-5008 EXH.B/CUTOUT

FR GRD

J-500 21

J-5007 EXH.B/CUTIN

RR 12V

J-500 12

J-5006 IND.

RR SIG

J-500 29

J-5003 IG

J1850

J-500 4

MODE1

FRASH

MODE2

MODE3

0.5BR/B0.5BR/B

0.5B

R/R

0.5L

0.5L

G0.

5B

0.5BR/B

H-815

H-14

10

J-23

2

SW ; ACCEL

B-75 1B-752

H-816H-149

H-532

3R

3R

3B

3B

0.5B/Y

0.3W/V

0.5LG0.5LG

0.5LG

0.5G/O

0.5G

0.5GH-511 H-162

STOPLAMP(RH)

0.5G

STOPLAMP(LH)

0.5G

0.5G

0.5L

0.5YSPEED SENSOR(RR,LH)

16 15 14 13 12 11 10 98 7 6 5 4 3 2 1

H-535

J-23

3

J-41

2

J-41

1

J-23 1

DIODE ;FICD

J-31

2

J-31

1

MAG.VALVE ;EXH.BRAKE

VSV ;FICD

0.5B

J-40

2

J-40

1

VSV ;INT.THROTTLE

ALDLCONNECTORB-79

0.3W/GH-534

H-533

A/CCOMPRESSOR

SW ; THERMO(ENG.WARM)

E-9

2

E-9

1

3R

0.5G

0.5LG

3B

0.5B

R/R

0.5LG/B

0.5B

R/R

0.5BR/B

2B

3B

3B


Circuit Diagram-FOR 24VOLT

ABS40A

P-4

P-5

BATTERYP-3

P-2BATTERY

P-1

J-9FRAME-LH (CENTER) 2B 2B 2B

B-7HEADLIGHT BRACKET (LH) 3B 3B3B 3B

78

2B-1

B-29 JOINTCONNECTORFRAME-LH (FRONT) 0.85B

RELAY ; EXH.BRAKE

B-38 5

B-38 4

B-381H-62

B-382

B-31 5B-312

B-31 6B-313

B-31 4B-311

B-51 7B-518

FL-4

MAIN60A

FL-1 EXH.BRAKE10A

F-14

KEY SW60A

FL-2

GAUGEBACK10A

F-12

8B 8W

3R

5W 3W

0.5W/R

0.3B

5W 0.5G/Y

3R

0.5G

0.5LG

SW ; STOP LAMP

B

OFF

ACC

ON

ST

B-672

B-67 3

KEY SW

3W/B

3W/B

2B/R 0.5LG/W

0.5L

G/W

0.3B

0.3B

0.5B

0.5B

0.5B

/Y0.

5P0.

5B0.

5B/G

0.5L

G/R

0.5B

0.5B

0.3B 0.5B

2B

0.5L

G/B

0.5LG/B 0.5LG/R

0.5BR/R

0.5B

/Y

0.5L

G/B

0.5LG/R

RELAY;CHARGE

J-16

3

J-16

1

J-16

2

J-16

5

H-8

8

H-71

J-16

4

STOP LAMP10A

F-10

B-66 2B-661

SW ; NEUTRAL(Neutral=ON)

RELAY ;EXH.BRAKECONTROL

SW ; EXH.BRAKE

SW ;ENG.WARMING

0.5LG/B

0.5LG/B

0.5B/Y

0.5B/Y

0.3B

0.3B

0.5BR/B

0.5W

B-35

3

B-35

4

B-35

5

B-35

2

E-11

2

H-145

E-11

1

J-18

4

J-18

2

H-14

10

3B/Y

METERABS

B-69

5

H-8

6

B-69

3

J-18

3

J-18

5

H-8

17

SW ; CLUTCH

B-89 2B-891

B-52 10B-518

IND.LAMP ;EXH.BRAKE

0.5LG/R0.5LG/R

H-5

38

B-18

1

H-5

39

B-18 2B-183

0.5G/O

RELAY ;ABS IND.

DIODE

A/CCOMPRESSOR

0.5B/Y

0.5B/Y

RELAY ;TAILRELAY ;

EXH.B/CUT (ABS)

0.5BR/B

0.5B

0.3B

3B

3B

0.85

B

0.3W

/V0.

5BR

/R

0.5L

G/W


J-1482

J-1481

0.5R

0.5W

0.3Y

0.3W/G 0.3W/G

0.3W/B

0.3W/B0.3L 0.5

B0.

5B

SPEED SENSOR(RR,RH)

J-741

J-742

0.5P

0.5LSPEED SENSOR(FRT,RH)

J-751

J-752

0.5V

0.5R/BSPEED SENSOR(FRT,LH)

0.5B

0.5B

3B

0.5LG/W

J-500 22J-50016 STOP LAMP

EHCU ; ABS

RL 12V

J-500 34

J-1492

J-1491J-50024 MOTOR +B

RL SIG

J-500 32J-5002 VALVE +B

FL SIG

J-500 33J-50023 MOTOR GND

FL GRD

J-500 10

J-5001 VALVE GND

FR SIG

J-500 11

J-5008 EXH.B/CUTOUT

FR GRD

J-500 21

J-5007 EXH.B/CUTIN

RR 12V

J-500 12

J-5006 IND.

RR SIG

J-500 29

J-5003 IG

J1850

J-500 4

J-50015 MODE1

FRASH

J-50014 MODE2

J-50017 H-534

H-533

MODE3

0.5BR

0.5BR/B

0.5B

R/R

0.5L

/G0.

5L/G

0.5L

G0.

5B

0.5B

0.5LG

0.5BR/R

J-15

5

J-15

4

J-15

1

H-811

J-15

2

J-23

2

H-132

SW ; ACCEL

B-75 2B-751

THERMO SW ;ENG.WARMING

E-86 2E-861

B-234 14

H-518

H-532

B-23321 QWS

C/U ; ENGINE

CHECKER

B-234 29

B-23314 EXH.BRAKE

DIAGB-23415

H-5 37

FICD

0.5B/Y(NQR)

3R

3B

3B

0.5B/Y

0.3W/V

0.5B/Y(NQR)

0.5B/Y(NQR)

0.5BR/W

0.5LG 0.5LG

0.5BR/W

0.5L/W

0.5L/W

0.5G

0.5B

R/B

0.5B

R/B

3B

0.5B

R/B

0.5GH-511 H-162

RELAY ;CERAMIC

HEATER

H-200

2

STOPLAMP(RH)

0.5G

STOPLAMP(LH)

0.5G

0.5G

0.5L

0.5YSPEED SENSOR(RR,LH)

16 15 14 13 12 11 10 98 7 6 5 4 3 2 1

RELAY ;ENG.WARMING CUT

H-85

J-23

4

H-13

12

EX-1

2

EX-1

4

J-23 3J-231

DIODE ;FICD

J-31

2

J-31

1

MAG.VALVE ;EXH.BRAKE

VSV ;FICD

EX-3

2

EX-3

1

VSV ;INT.THROTTLE

H-136

ALDLCONNECTORB-79

0.5G

0.5LG

3R

0.5LG/B

3B3B

0.5B


Connector List

LGBRK-AE-0108

You are requested to order this manual using themanual number that is shown above.

This manual is applicable for vehicles in all countriesexcept the USA and Canada.

All rights reserved. This manual may not bereproduced in whole or in part, without the permissionin writing of ISUZU MOTORS LIMITED.

Issued byISUZU MOTORS LIMITED

INTERNATIONAL SERVICE DEPARTMENT

Tokyo, Japan

First edition Jan., 2001

LGBRK-AE-0108 PRINTED IN JAPAN

TOPCAB AND CHASSIS ELECTRICAL ANTI-LOCK BRAKE SYSTEM (ABS)CAB AND CHASSIS ELECTRICALFuse And Fusible Link LocationFuse And Circuit BreakerFusible LinkFuse Block Circuit

Relay LocationRelay ListDiode LocationABS (Anti-lock Brake System)Parts LocationCircuit DiagramConnector List

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