2003 HONDA CIVIC Body

Heating and Air Gonditioning
a
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Power Transistor Test
1. Disconnect the 4P connector from the power
Iranslslor.
2, Measure the resistance between the No. 1 and
No. 2 terminals of the power transistor. lt should be
about '1.4 1.5 kQ.
. lf the resistance iswithln the specifications, go to
step 3.. lf the resistance is notwithin the specifications,
replace the power transistor.
POWER TRANSISTOB
Carefully release the lock tab on the No. 4 terminal(BLUI/EL) (A) in the 4P connector, then remove the
terminal and insulate it from body ground.
(To 12 V power source on vehicle)
Reconnect the 4P connector to the power transistor.
Supply 12 volts to the No. 4 cavity with a jumper
wire.
Turn the ignition switch ON (ll), and check that the
blower motor runs.
. lf the blower motor does not run, replace the
power rranstsror.. lf the blower motor runs,the powertransistoris
oK.
12 V power source on vehicle)
21-38
1.
Heater Control Panel and Push
Switch Assembly Removal and
Installation
Remove the center panel (see page 20-62).
Remove the dials (A), then remove the self-tapping
screws and the heater control panel (B)from the
center panel (Cl. Remove the self-tapping screws
and the push switch assembly (D)from the center
panel.
lnstall the control panel and push switch assembly
in the reverse order of removal. After installation,
operate the control panel controls to see whether it
worKs propeny.
Run the self-diagnosis function to confirm that
there are no problems in the system (see page 21-
8).
3.
4.

\Body Electrical
Body ElectricalSpecialToolsGeneral Troubleshooting tntorrnaiion.'......
Relay and Control Unit Locations .....
Connectors and Harnesses
Fuse/Relay Boxes ...............................
Power Distribution .............................
Ground Distribution ...........................
Under-dash Fuse/Relay Box ..............
Battery ..............
Relays ................
*lgnition Switch ..............
*Gauges
Component Location Index .......................Self-diagnostic Procedure ..........................Circuit DiagramGauge Bulb Replacement ..........................Gauge Assembly ReplacementCoolant Temperature
Gauge Troubleshooting .... ....................Vehicle Speed Signal CircuitTroubleshootingVSS Replacement
Exterior LightsComponent Location Index .......................Circuit DiagramDaytime Running Lights ControiUnit Input Test (Canada) ........................Headlight Ad,ustment .................. .. .....Headlighr Replacement ..............................Combination Light SwitchTest/ReplacementBulb ReplacementTaillight Replacement ..........................High Mount Brake Light Replacement ......License Plate Light Replacement ..............Side Marker Light Replacement ................Brake Pedal Position Switch Test ..............Side Turn Signal Light Replacement ........
Turn Signal/HazardFlasher SystemComponent Location Index .......................Circuit DiagramTurn Signal/Hazard Relay lnputTest ........Hazard Warning Switch Test
22,3
22-7
22-13
22-44
22-46
22-4A
22-49
22-50
22-51
22-53
22-5422-5622-5422 6322-64
22-64
22-6522 61
22-6822--71
22-7 622-7422-79
22-AO22-4122-8222-4222-4322-4322-4422-84
22-8522 A622-8722-88
22-10422-105
22-10622-107
Entry Lights control systemComponent Location Index ....................... 22-89Circuit Diagram ......... 22 90lgnition Key Switch Test .....................,...... 22-9'llgnition Key Light Test ............................... 22-91Control Unit Input Test ..........,.................... 22 92
Interior LightsComponent Location Index ....................... 22-94Circuit Diagram ......... 22-95Ceiling LighVSpotlightsTesVReplacement ................................... 22-96Rear Ceiling Light TesVReplacem ent ........ 22-96Cargo Area Light Test/Replacem ent ......... 22-97Hatch Latch Switch Test ..,..,....................... 22-97
*Audio SystemComponent Location Index ....................... 22-98Circuit Diagram ......... 22,99Audio Unit Removal/lnstallation ............... 22-1OOAudio Unit Connector Replacement ......... 22-101Speaker Replacement ................................ 22-102Roof Antenna Rep1acement ....................-.. 22-103
Rear Window DefoggerComponent Location Index ...........Circuit Diasram .. ....... .. ..... ....... ...:::::.::.::.Function TestDefogger Wire Repair .................................Noise Condenser CapacityTest ................
MoonroofComponent Location Index ....................... 22-1OBCircuit Diagram ......... 22-109Moonroof Control Unit Input Test ............. 22-'l10Switch TesVReplacement ........,.....,........... 22-1 12Motor Test ................. 22-112Limit Swilch Test ...... 22-'l'13Auto-stop Switch Test ................................ 22-1 13
Power MirrorsComponent Location Index ....................... 22-114Circuit Diagram ......... 22-115Function Test ............. 22-116Power Mirror Switch Test .......................... 22-ll7Power Mirror Actuator Test ....................... 22-117Power Mirror Actuator Replacement ........ 22-11A
* HornsComponent Location Index ....................... 22-120Circuit Diagram ......... 22-121Horn TesVReplacement ...........................-. 22-122Horn Switch Test .,.... 22-122
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Body Electrical
SpecialTools
@
Ref. No.Tool NumberDescription Otv
Q)
o)
o
07wAz-001010A
O7 LAJ - PT3 O 2OA
07TAz-001020A
MPCS Service Connector 1
Test Harness 1
Back Probe Adaotet 1
22-2

General Troubleshooting Information
Tips and Precautions
Bef ore Troubleshooting
1. Check applicable fuses in the appropriate fuse/relay
oox.
2. Check the battery for damage. state of charge, and
clean and tight connections.
. Do not quick-charge a battery unless the battery
ground cable has been disconnected, otherwise
you will damage the alternator diodes.. Do not attempt to crank the engine with the
battery ground cable loosely connected or you
will severely damage the wiring.
Handling Connectors. Make sure the connectors are clean and have no
loose wire terminals.. Make sure multiple cavity connectors are packed with
dielectric grease (except waterti ght connectors).. All connectors have push-down release type locks (A).
Some connectors have a clip on their side used to
attach them to a mount bracket on the body or on
another component. This clip has a pull type lock.
Some mounted connectors cannot be disconnected
unless you first release the lock and remove the
connector from its mount bracket (A).
Never try to disconnect connectors by pulling on their
wires; pull on the connector halves instead.
Alwavs reinstall Dlastic covers,
Before connecting connectors, make sure the
terminals (A) are in place and not bent.
(cont'd)
22-3

Body Electrical
General Troubleshooting Information (cont'd)
Check for loose retainer (A) and rubber seals (B).
The backs of some connectors are packed with
dielectric grease. Add grease if necessary. lf thegrease is contaminated, replace it.
lnsert the connector all the way and make sure it is
securelv locked.
Position wires so that the open end of the cover faces
oown.
22-4
Handling Wires and Harnesses. Secure wires and wire harnesses to lhe frame with
their respective wire ties at the designated locations.. Remove clips carefully; don't damage their locks (A).
Slip pliers (A) under the clip base and through the
hole at an angle, then squeeze the expansion tabs to
release the clip.
After installing harness clips, make sure the harness
doesn't interfere with any moving pans.
Keep wire harnesses away from exhaust pipes and
other hot parts, from sharp edges of brackets and
holes, and from exposed screws and bolts.
Seat grommets in their grooves properly {A). Do not
leave grommets distorted (B).
lt" /wl/
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It
J
|,f . ./.ll t/
----E; F.'l/
I

Body Electrical
General Troubleshooting Information (cont'dl
Five-step Troubleshooting
'1. Verify The Complaint
Turn on allthe components in the problem circuit
to verify the customer complaint. Note the
symptoms. Do not begin disassembly or testing
until you have narrowed down the problem area.
2. Analyze The Schematic
Look up the schematic for the problem circuit.
Determine how the circuit is supposed to work by
tracing the current paths from the power feed
through the circuit components to ground. lf
several circuits fail at the same time, the fuse or
ground is a Iikely cause.
Based on the symptoms and your understanding of
the circuit operation, identify one or more possible
causes of the problem.
3. lsolate The Problem By Testing The Circuit
Make circuit tests to check the diagnosis you made
in step 2. Keep in mind that a logical, simple
procedure is the key to efficient troubleshooting.
Test for the most likely cause of failure first, Try to
make tests 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
proceoures.
5. Make Sure The Circuit Works
Turn on all components in the repaired circuit in all
modes to make sure you've fixed the entire
problem. lf the problem was a blown fuse, be sure
to test all of the circuits on the fuse. Make sure no
new problems turn up and the original problem
does not recur.
22-6
Wire Color Codes
The following abbreviations are used to identify wire
colors in the circuit schematics:
wHT....................,.,.............
YEL......................,,.......,......
B1K......................................
BLU ....,................................
GRN.....................................
RED ....................................,
oRN.....................................
PNK..........................,..........
BRN.....................................
GRY....................................,
PUR.....................................
1T81U..........................,.....
1TGRN...........................,...
White
Yellow
Black
Blue
Green
Red
Orange
Pink
Brown
Gray
Purple
Light Blue
Light Green
The wire insulation has one color or one color with
another color stripe. The second color is the stripe.

Connectors and Harnesses
Gonnector to Harness lndex
Battery Ground Cable
Connector or TerminalCavitiesLocationConnectstoNotesT3Left side of enqine compartmentLeft side of engine compartmentBody ground via batteryqround car)le2BattervBatterv neoative terminal
Engine Ground Cable
Connector or TerminalCavitiesfocationConnec{stoNotesr45Rioht side of enoine4Right side of engine compartmentBody ground via engine
ENGINE GROUND CABLE
BATTERY GROUND CABLE
\.....
22-14

Connectors and Harnesses
Connector to Harness Index {cont'dl
Engine Compartment Wire Harness (Right branch)
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Connsctor or TerminalCavitissLocationConnects toNotesABS modulator-control unitBearwasher motorRight front ABS wheel sensorRight front airbag s€nsorBightfront parking lightRight front side marker lightRight front turn signal lightRight headlightRight hornwash€rfluid level switchWindshield washer motor
812
110112
7
222222
I22
Bight side o{ engine compartmentBehind right side of {ront bumperRight side ot engine compartmentBehind right side of front bumperBehind right headlightBehind rightside of Jront bumperBehind right headlightBehind right headlightBehind front bumperBehind rightside of tront bumperBehind rioht side of front bumoerCanada
G202
G2016Behind rightside of tront bumper
Behind rightside of Jront bumper
Body ground via €nginecompartment wtre harnessBody ground via engine.omnerhent wire harness
22-18