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The next few pages describe how this manual is organized. They also
explain what kind of information the manual contains, what the
information means, and how to use it to troubleshoot electrical problems.
Circuit schematics break the entire electrical system into individualsystems, like the Back-up Lights on the next page. Only electrical
components that work together are shown together, so you wont be
distracted by unrelated wires.
Explanations of the abbreviations and symbols used in the schematics
begin on page . Youll need to know what they mean before you can use
a schematic effectively.7
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YEL
See page 10-9.
2
Circuit Schematics
Each schematic represents one circuit. Acircuits wires and components are arranged toshow current flow, from power at the top of thepage, to ground at the bottom.
Shared Circuits
Other circuits may share power or groundterminals or wiring with the circuit shown. Awire that connects one circuit to another, forexample, is cut short and has an arrowhead atthe end of it pointing in the direction of currentflow. Next to the arrowhead is the name of thecircuit or component which shares that wiring.To quickly check shared wiring, check theoperation of a component it serves. If thatcomponent works, you know the shared wiringis OK.
ConnectorsAll in-line and junction connectors arenumbered (C725, C416, etc.). Componentconnectors are not numbered but are identifiedeither by the name of the component if thecomponent only has one connector, or by acapital letter (A, B, C, etc.) if the componenthas more than oneconnector.
Below most connector numbers andcomponent names are PHOTO and VIEWnumbers. The PHOTO numberrefers to a photo in the back of the bookthat shows the connectors location on the car.The VIEW number refers to an illustration inthe back of the book that shows the connectorterminals, wire colors, connector cavitynumbers, and other details.
The connector cavity numbering sequencebegins at the top left corner of the connectoras seen from either of the viewpoints shownon page . Except for the DLC (data linkconnector), disregard any numbers moldedinto the connector housing.
Wires
Wires are identified by the abbreviated names
of their colors; the second color is the color ofthe stripe. Wires are also identified by theirlocation in a connector. The number 2 next tothe male and female wire terminals at C554, forexample, means those terminals join in cavity 2of connector C554.
Symbols
A complete description of schematicsymbols begins on page .
YEL
BLK
Fuse 97.5A
DriversUnder-dashFuse/RelayBoxPHOTO 85VIEW 60
HOT IN ON OR START
B4
A
YEL
B
6 C102PHOTO 34VIEW 40
GRN/BLK
17 C204PHOTO 91VIEW 52
GRN/BLK
Back-upLight Switch1 = Transmission
in reversePHOTO 20
LeftBack-upLight
3)(Coupe 2)
(Coupe 1)2)
BLK
G601PHOTO 148PHOTO 158 (Coupe)
RightBack-upLight
3)(Coupe 2)
(Coupe 1)2)
A6
C554PHOTO 150VIEW 38
GRN/BLK
GRN/BLK
GRN/BLK GRN/BLK
K2DriversUnder-dashFuse/Relay BoxPHOTO 85VIEW 60
1
See page 10-9.
GRN/BLK
YEL
GRN/BLK
7
8
HOT label tells you whenthe ignition switch suppliespower to the fuse.
Arrow with notemeans other circuitsconnect here.
Junction connector has oneor more bus bars in it; eachbar connects two or morewire terminals.
Femaleterminal
Maleterminal
In-line Connectornumber;Index begins onpage 203.
Number of photoin back of bookshowing componentlocation on vehicle.
Number of connectorterminals view inback of book
Splice
Wire color code;defined onpage .7
Capital letter means thedrivers under-dashfuse/relay box has morethan one connector.
Arrowhead meanswire connects toanother circuit;it points in directionof current flow.
GroundVariationsare indicatedby model.
Cavity number;assigned as
shown on page .8
Numbers insidecomponents refer tonotes listed belowcomponent name.
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Power Distribution schematics show how power is supplied from the positive battery terminal to
various circuits in the vehicle. Refer to the Power Distribution section to get a more detailed
understanding of how power is supplied to the circuit you are working on. Individual circuit
schematics begin with a fuse. So, if Power Distribution shows that an inoperative circuit andanother circuit share a fuse, check a component in the other circuit. If it works, you know the fuse
is good, and power is available to the inoperative circuit.
3
+
Battery Transmission
T3
BLK
StarterSolenoid
T2
Starterpage 21 (L4)or 21-1 (V6)PHOTO 22PHOTO 50 (V6)
BLK
BLK/YEL
BLK/YEL
G1PHOTO 40PHOTO 58 (V6)
RadiatorFan ControlModulepage 63-1VIEW 28
D10
5 C203PHOTO 120
WHT
WHT
Fuse 5820A
A/C CondenserFan Relaypage 63 (L4)or 63-1 (V6)
A/C CompressorClutch Relaypage 62 (Man A/C)or 62-1 (Auto A/C)
Multi-RelayBoxPHOTO 9
SeatHeaterRelaypage 147
D2
WHT/GRN
PassengersUnder-dashFuse/Relay BoxPHOTO 91VIEW 67
RearWindowDefoggerRelaypage 64(Man A/C)or 64-1(Auto A/C)
C3
WHT/GRN
Fuse 5340A
B
Fuse 5920A
To page10-3.
Alternatorpage 22 (L4)or 22-1 (V6)PHOTO 12PHOTO 55 (V6)
T102
BLKor
WHT
A17
4 C201PHOTO 120VIEW 45
WHT/GRN
WHT/GRN
Fuse 4615A
8
WHT/GRN
See page10-3.
Fuse 4250A
7
WHT/GRN
PGM-FIMain Relaypages 23,24, 39,and 132PHOTO 99VIEW 22
DLCpage 23-3 (L4)or 24-3 (V6)PHOTO 95VIEW 47
T101
6
V6
ELDUnit
Fuse 41100A
A
T1
To page10-2.
Under-hoodFuse/Relay Box
PHOTO 9VIEW 68
Canada EX
D2
1 1
5
Power Distribution Schematics
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Ground Distribution Schematics
This sample Ground Distribution schematic shows all of the components that share the same
ground point.
1
LeftInnerTaillightpage110-5
2
LeftBack-upLightpage110-12
Trunk KeyCylinder
Switchpage 130-4PHOTO 154
1
1 2
RightBack-upLightpage110-12
2
LicensePlateLightpage110-5
1
TrunkLatchSwitchpages 84and 114PHOTO 153
EX
G601PHOTO148
3
Brake LightFailure Sensorpage 110-1PHOTO 147VIEW 1
1
Right RearTurn SignalLightpage 110-3
2
TrailerLightingConnectorpage 118PHOTO 149VIEW 13
2
LeftBrake Light/Taillightpages 110-1and 110-5
1
Left RearTurn SignalLightpage 110-3
2
RightBrake Light/Taillightpages 110-1and 110-5
DX, LX
Trunk LatchPHOTO 155
VIEW 14
46
Opener
Motorpage130-4
LatchSwitchpages
84-1,114, and130-4
WHT
BLU
RightInnerTaillightpage110-5
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Connector LocationsTo see where a component or connector is located on the car, look up its photo number in the
Component Location section that begins on page 201. The photo will also tell you the color of
the connector and how many cavities it has.
To see where connectorsand parts are located,look up their photos in theComponent Location sectionthat begins on page 201.
3
EGR Valve andEGR Valve
Position SensorPHOTO 17VIEW 3
3
TPSensorPHOTO 16
1 C101PHOTO 34VIEW 29
YEL/BLU
YEL/BLU
1
FTPSensorPHOTO 73
C28
YEL/BLU
ECM/PCMPHOTO 114VIEW 66Reference
voltage(VCC2)
If there is no photo number below or beside a component name or a connector, ground, or
terminal number, look up that name or number in the appropriate Connector-to-Harness Index
that begins on page 203. The chart lists how many cavities a connector has, where it is located,
and what it connects to. The related illustration shows the connectors location on the harness,
and the harness routing.
+
203-31
1
2
3
4
5
6
78
9
DRIVERSPOWERSEAT WIREHARNESS
Drivers Power Seat Wire Harness
1 Power seat rear up-down motor 2-GRY Under drivers seat EX2 Power seat front up-down motor 2-GRY Under drivers seat EX
3 Drivers seat belt switch 2-GRY Under drivers seat EX
4 Not used 3 Under drivers seat Heatedseats
5 Power seat adjustment switch 6-GRY Left side of drivers seat EXconnector B
6 C552 10-GRY Under drivers seat Left side wire harness(see page 203-20)
7 Power seat adjustment switch 6-GRY Left side of drivers seat EXconnector A
8 Power seat recline motor 2-GRY Under drivers seat EX
9 Power seat slide motor 2-GRY Under drivers seat EX
Connector or TerminalCavities/
Color Location Connects to NotesRef
YEL/BLUYEL/BLU
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Connector Terminal Views
To see the configuration of a connectors cavities, look up its view number in the Connector
View section that begins on page 202. Each view includes the color of the connector, where
it is located, and what it connects to.
Use the Connector View Section to help locate the proper cavity when you need to test aconnector. It can be especially helpful if the connector has more than one wire of the same
color. A dash symbol ( ) indicates that the cavity is empty.
Connector views can also be used to help diagnose multiple symptoms in separate circuits
that could be caused by a single problem in a connector shared by those circuits. Heres
how:
1 Pick one of the multiple symptoms and look up the schematic for that circuit.
2 Make a list of all the in-line and fuse box connectors in that schematic (include page
numbers).
3 Then, in the Connector View section, look up each connector on your list to see if circuits
related to the other symptoms run through one of them. If they do, inspect that connector
for the problem.
Example: The blower, rear window defogger, and the windshield wiper dont work. List all
in-line and fuse box connectors in the blower controls circuit and then check the Connector
View section (sample below). You find that C324 is common to the rear window defogger
circuit and wiper/washer circuit, so you inspect C324 and find the problem: damaged
terminals.
1 WHT (Blower controls)
2 YEL/BLU(Rear window defogger)
3 BLK/WHT (Starting)
4 BLU/YEL (Wiper/washer)
5 BLU (Wiper/washer)
6 BLK/YEL (Ignition)
7 WHT/BLU (ABS)
21. C324 Brown Behind left kick panel Connects left engine compartment wire harness to
main wire harness
754 6
21 3
Connector Terminal Views
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2
BLU/RED
5C134
RED/BLU
RED/BLU
This circuit continues on
another page or at a different
location on the same page.
The arrow shows direction
of current flow. To follow the
RED/BLK wire in these
examples, you would look
for the A arrow on page
23-5 or on the same page.
Symbols
This broken line means
that both terminals are inconnector C134.
Wire Color Abbreviations
To page23-5.
Wires
A broken line means that this part of the
circuit is not shown. Refer to the page
listed for the complete schematic.
Where separate wires
join, only the splice is
shown. For details on
the additional wiring,refer to the page listed.
Wire choices for options or
different models are labeledand are shown with a choice
bracket like this.
Wire insulation can be
one color, or one color
with another color stripe.
(The second color is the
color of the stripe.)
This means that the branch of
the wire connects to another
circuit. The arrow points to the
name of the circuit branch
where the wire continues.
The following abbreviations are used to
identify wire colors in the circuit schematics:
BLK black. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BLU blue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BRN brown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GRN green. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GRY gray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .LT BLU light blue. . . . . . . . . . . . . . . . . . . . . . . . .LT GRN light green. . . . . . . . . . . . . . . . . . . . . . .ORN orange. . . . . . . . . . . . . . . . . . . . . . . . . . . . .PNK pink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PUR purple. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RED red. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .WHT white. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
YEL yellow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .NAT natural. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ECM/PCM
BRN
BRN
C28
A
Name of Circuit
ORN
RED/BLK
See page 14.
YEL/RED
M/TA/T
ORN ORN
To thispage.
ARED/BLK
ORN
BLU/RED
BRNSee Circuit D46,page 15-9.
See Circuit E03,page 15-9.
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This means that theconnector connects to a
lead (pigtail) wired directlyto the component.
This means that theconnector connectsdirectly to the component.
The name of the componentappears next to it followedby notes about its function,along with any photo andconnector view references.
This symbol representsone bus bar inside the capof a junction connector.A junction connector capmay contain several busbars, but only the oneaffecting that circuit will beshown. The dots representtabs on the bar that thewire terminals connect to.
Components
Splices
MaleTerminal
Cavity/ Terminal 6
The cavities and wire terminals in eachconnector are numbered starting from theupper left (locking tab up), looking at the maleterminals from the terminal side or looking atthe female terminals from the wire side. Bothviews are in the same direction so thenumbers are the same. The gender of theconnector is determined by the pins within theconnector. All cavities are numbered, even ifthey have no wire terminals in them.
NOTE: DLC terminals are numberedaccording to SAE standard J1962, not theHonda standard. The numbers of the four endterminals are molded into the corners of theconnector face.
Female Terminal
The connector cavity number is listed nextto each terminal on the circuit schematic.The cavity/terminal shown below is #6.
Remaining wires tothe same bus bar arerepresented by adashed line.
Splices are shown as a dot. Their locationand the number of wires may varydepending on the harness manufacturer.
A solid border line means thatthe entire component is shown.
A broken border line indicatesthat only part of the componentis shown.
Wire Sideof
Female Terminals
Terminal Sideof
Male Terminals
1 2 3
4 5 6
Connectors C
BLK
BLK
BLK
BLKBLK
BLK
BLKBLKBLK
1
See page 10.
C103
BrakePedalPositionSwitch1 = Brake pedal
pressed.PHOTO 98
6 C103
GRY
GRY
Symbols
0
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Symbols
HOT IN ON
Fuse 610A
GRN/BLK
G101
This symbol means that the endof the wire is attached(grounded) to the car frame orto a metal part connected to theframe.
Each wire ground (G) isnumbered for reference.
This ground symbol (dot and 3lines) overlapping the componentmeans that the housing of thecomponent is grounded to thevehicle frame or to a metal part
connected to the frame.This symbol representsthe bus bar inside a groundconnector. The dotsrepresent tabs on thebus bar that the wireterminals connect to.The ground symbol (large dot)is the connection between thebus bar and metal (grounded)part of the vehicle.
Each T terminal (ring type)is numbered for reference andlocation. A T terminal issecured with a screw or bolt.
This represents RFI(Radio FrequencyInterference) shieldingaround a wire.
These switches move
together; the broken straightline between them means thatthey are mechanicallyconnected.
A Zener diode blocks reversecurrent at normal voltages just likea rectifier diode. At high voltages,however, a Zener diode allowscurrent to flow in reverse.
Fuses
Diodes
Identification
Current rating
A rectifier diode works like a oneway valve. It allows current toflow only in the direction of thearrow.
Terminals T Screwterminal
Shielding
Other types of switches arecontrolled by a coil or a solidstate circuit. Unless otherwisenoted, all switches are shownin their normal (rest) position,with power off.
Ground G
This means that power is suppliedwhen the ignition switch is in ON (II).
Switches
GRN
G103
T102
G500
0 1 0 1
Solid-State
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Symbols
Light Emitting Diode (LED)
LEDs are special diodes that emit light when
connected in a circuit. LEDs work the same
as a rectifier diode by allowing current to flowonly in one direction.
Resistor
This symbol represents a component in
electrical circuits that resists the flow of
electrical current. Resistance is denominatedin Ohms. Higher resistance results in less
current flow. This type of resistor has a fixed
resistance value.
Motor
This symbol represents a DC voltage
electrical motor. Motors can reverse direction
by changing the polarity of the voltage.
Variable Resistor
This symbol represents a component in
electrical circuits that resists the flow ofelectrical current. Resistance is denominated
in Ohms. Higher resistance results in less
current flow. This type of resistor (thermistor)
has a variable resistance value that changes
with temperature. The resistance of a
thermistor decreases as temperature
increases.
Pressure Sensor
A pressure sensor is a variable resistor used
to monitor the difference in pressure between
the intake manifold and outside atmosphere
(Map Sensor). This information is used by
the engine computer to monitor engine load
(vacuum drops when the engine is under loador at wide open throttle). When the engine is
under load, the computer alters spark timing
and the fuel mixture to control performance
and emissions.
NOTE: There is also a FTP (Fuel Tank
Pressure) Sensor used to monitor EVAP
System testing.
Solenoid
An electromagnet is produced by current
flowing through a coil of wire. A plunger inside
the wire coil is moved by the electromagnet
turning ON or OFF.
Transistors
Transistors are electrical devices that havetwo key properties: 1) they can amplify an
electrical signal and 2) they can switch ON
and OFF, letting current through or blocking it
as necessary.
M
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Five-Step Troubleshooting Test Equipment
1. Verify The Complaint
Turn on all the components in the problemcircuit to check the accuracy of the
customer complaint. Note the symptoms.Do not begin disassembly or testing untilyou have narrowed down the problem area.
2. Analyze The Schematic
Look up the schematic for the problemcircuit. Determine how the circuit issupposed to work by tracing the currentpaths from the power source through thecircuit components to ground (certaincircuits contain a How the Circuit Workssection). Also, trace circuits that sharewiring with the problem circuit. The names
of circuits that share the same fuse,ground, or switch, and so on, are referredto in each circuit schematic. Try to operateany shared circuits you didnt check in step1. If the shared circuits work, the sharedwiring is OK, and the cause must be in thewiring used only by the problem circuit. Ifseveral circuits fail at the same time, thefuse or ground is a likely cause.
Based on the symptoms and yourunderstanding of the circuits operation,identify one or more possible causes.
3. Isolate The Problem By Testing The Circuit
Make circuit tests to check the diagnosisyou made in step 2. Keep in mind that alogical, simple procedure is the key toefficient troubleshooting. Test for the mostlikely cause of failure first. Try to maketests at points that are easily accessible.
4. Fix The Problem
Once the specific problem is identified,make the repair. Be sure to use proper
tools and safe procedures.
5. Make Sure The Circuit Works
Turn on all components in the repairedcircuit in all modes to make sure youvefixed the entire problem. If the problemwas a blown fuse, be sure to test all of thecircuits on that fuse. Make sure that nonew problems turn up and that the originalproblem does not recur.
CAUTION:
Most circuits include solid-state devices.Test the voltages in these circuits only with
a 10-megaohm or higher impedance digitalmultimeter. Never use a test light or analogmeter on circuits that contain solid-statedevices. Damage to the devices may result.
Test Light and DVOM
On circuits without solid-state devices, usea test light to check for voltage. A test lightis made up of a 12 volt bulb with a pair ofleads attached. After grounding one lead,touch the other lead to various points alongthe circuit where voltage should be present.
The bulb will go on if there is voltage at thepoint being tested. If you need to know howmuch voltage is present, use a digitalvolt/ohmmeter (DVOM). If, in addition, youneed to know exactly how much resistancethere is between two points, use a digitalvolt/ohmmeter (DVOM).
In the OHMS range, the DVOM will measureresistance between two points along a circuit.Low resistance means good continuity.
Diodes and solid-state devices in a circuit can
make a DVOM give a false reading. To checka reading, reverse the leads, and take asecond reading. If the readings differ, thecomponent is affecting the measurement.
To order any test equipment shown above,contact your local tool supplier. For a list ofsuppliers and tool numbers, refer to HondaRequired Special Tools and EquipmentService Bulletin.
FUSED JUMPER WIRE
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3. When connecting a connector, push it untilit clicks into place.
CAUTION:
D Do not pull on the wires when
disconnecting a connector. Pullonly on the connector housings.
D Most circuits include solid-statedevices. Test the voltages in thesecircuits only with a 10-megaohm orhigher impedance digital multimeter.Never use a test light or analog meter oncircuits that contain solid-state devices.Damage to the devicesmay result.
Troubleshooting Precautions
Jumper Wire
Use a jumper wire to bypass an open circuit.A jumper wire is made up of an in-line fuse
holder connected to a set of test leads. Itshould have a five ampere fuse. Neverconnect a jumper wire across a short circuit.The direct battery short will blow the fuse.
Before Troubleshooting
1. Check the main fuse and the fuse box.
2. Check the battery for damage, state ofcharge, and clean and tight connections.
CAUTION:
D Do not quick-charge a battery unlessthe battery ground cable has beendisconnected, or you will damage thealternator diodes.
D Do not attempt to crank the engine withthe ground cable disconnected or youwill severely damage the wiring.
While Youre Working
1. Make sure connectors are clean, and haveno loose terminals or receptacles.
2. Make sure that connectors without wireseals are packed with dielectric (silicone)grease. Part Number: 08798-9001.
To order any test equipment shown above,contact your local tool supplier. For a list ofsuppliers and tool numbers, refer to HondaRequired Special Tools and EquipmentService Bulletin.
Pack with dielectric (silicone) grease
FUSED JUMPER WIRE
Test Equipment
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Connect hereand light shouldcome on.
Testing for Voltage
When testing for voltage at a connector withoutwire seals, you do not have to separate thetwo halves of the connector. Instead, probe theconnector from the back. Always check bothsides of the connector because dirty, corroded,and bent terminals can cause problems (noelectrical contact = an open).
1. Connect one lead of the test light to aknown good ground, or, if youre using adigital volt ohmmeter (DVOM), place it inthe appropriate DC volts range, andconnect its negative lead to ground.
2. Connect the other lead of the test light orDVOM to the point you want to check.
3. If the test light glows, there is voltage
present. If youre using a DVOM, note thevoltage reading. It should be within one voltof measured battery voltage. A loss of morethan one volt indicates a problem.
NOTE: Always use a DVOM on highimpedance circuits. A test light may notglow (even with battery voltage present).
Testing for Continuity
When testing for continuity at a connectorwithout wire seals, you do not have to separatethe two halves of the connector. Instead, probethe connector from the back. Always checkboth sides of the connector because dirty,corroded, and bent terminals can causeproblems (no electrical contact = an open).
1. Disconnect the negative cable from thevehicle battery. If youre using a DVOM,place it in the lowest OHMS range.
2. Connect one lead of a DVOM to one end ofthe part of the circuit you want to test.
3. Connect the other lead to the other end.
4. If youre using a DVOM, a low reading or noreading (zero), means good continuity.
FuseBox
HOT AT ALL TIMES
Switch
Solenoid
RED
BLU
Test LightorDVOM
Connect hereand lightshould stay off.
DVOM HeaterFanSwitch
MED
LO HI
Troubleshooting Tests
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Testing for Voltage Drop
Wires, connectors, and switches are designedto conduct current with a minimum loss ofvoltage. A voltage drop of more than one voltindicates a problem. Circuits must be operatingwhen checking voltage drop.
1. Place the digital volt/ohmmeter (DVOM) inthe appropriate DC volts range. Connect thepositive lead to the end of the wire(or to the connector or switch) closest to thebattery.
2. Connect the negative lead to the other endof the wire (or the other side of theconnector or switch).
3. Turn on the components in the circuit.
4. The DVOM will show the differencein voltage between the two points. Adifference, or drop, of more than onevolt indicates a problem. Check thecircuit for loose, dirty, or bent terminals.
Testing for a Short with a Test Light or DVOM
1. Remove the blown fuse and disconnectthe load.
2. Connect a test light or digital volt/ohmmeter(DVOM), switched to the appropriate DCvolts range, across the fuse terminals tomake sure voltage is present. You mighthave to turn the ignition switch to ON; checkthe schematic to see.
3. Beginning near the fuse box, wiggle theharness. Continue this at convenient pointsabout six inches apart while watching thetest light or DVOM.
4. Where the test light goes off, or the DVOMvoltage drops to zero, there is a short to
ground in the wiring near that point.
NOTE: Always use a DVOM on highimpedance circuits. A test light may notglow (even with battery voltage present).
Fuse
Box
HOT AT ALL TIMES
Switch
Solenoid
RED
BLU
DVOM
Fuse
Box
HOT AT ALL TIMES
Switch
Solenoid
RED
BLUDisconnectthe load here.
Test LightorDVOM
SHORT TOGROUND
Troubleshooting Tests
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