2003 HONDA CIVIC fuse box

Evaporator Temperature Sensor
Replacement
1.Remove the driver's dashboard lower cover (see
page 20-59) and the under cover (see page 20-60).
Remove the under-dash fuse/relay box (see page
22-491.
Disconnect the 2P connector (A) from the
evaporator temperature sensor (B), then remove
the connector clip (C). Remove the self-tapping
screw, and carefully pull out the evaporator
temperature.
4. Install the sensor in the reverse order of removal,
Evaporator Temperature Sensor
Test
l. Dip the sensor in ice water, and measure the
resistance between its terminals
EVAPORATOR TEMPERATURE SENSOR
2.
3.
Terminal side ol male terminals
Then pour hot water on the sensor, and check {or a
change in resistance.
Compare the resistance readings with the
specifications shown in the graph; the resistance
should be within the specifications
RESISTANCEk9
t0
32050 68 86 'F
10 20 30'c
TEMPERATURE
21-37

\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
\

Relay and Control Unit Locations
Engine Compartment
RADIATOR FANRELAY
BLOWER MOTOR RELAY
HORN RELAY
CONDENSER FANRELAY
UNDER-HOODFUSE/RELAY BOX
\...
,-:1-'...
ELD UNIT
22-7

Relay and Gontrol Unit Locations
Dashboard
_DAYTIME RUNNING LIGHTS EELAY lCanada)lWire colorsr RED, RED/YEL, ILRED/BLK and RED/8LU I_LOW BEAM CUT RELAY lcanada) _lWire colors: REDMHT, RED/BLK, ILBEDA/EL and RED/BLU I
KEYLESS RECEIVER UNIT
CRUISE CONTROL UNIT
'
'-.:- ':
..? ;,
POWER WINOOW RELAY
TURN SIGNAL/HAZARD RELAY
TAILLIGHT RELAYUNDER.DASHFUSE/RELAY BOX; .[:_- -
-l:r --
22-8
MULTIPLEX CONTROL UNIT

Connector or TerminalRetCavitiesLocationConnoc,ts toNotesAlternatorKnock sensorStarter solenoidc102
c103
10857
6
4116
1
Right side of eng;ne compartmentFront of engineMiddle of engine compartmentFront of engine compartment
Front of engane compartment
Engine wire harness (seepage 22 16)Engine wire harness (seeoaae 22-16)T1r224L€tt side of engine compartmentMiddle or enoine comDanmentUnder hood fuse/relay boxStaner motorT101r1021IUnder-hood fuse/relay boxAlternatorBattervBatterv positive terminal
Starter Subharness
STARTER SUB HARNESS
22-15

Connectors and Harnesses
Engine Compartment Wire Harness (Left branch)
AirJuel (A,,/F) ratio sensorBrake fluid level switchCondenser fan motorCruise control actuatorELD unitFog light connectorLeft front ABS wheel sensorLeft front airbag sensorLeft front parking lightLeft front side marker lightLeft lrontturn signal lightLeft headlightLeft hornRadiator fan motorRadiator fan switchSecondary heated oxygen (SHO2S)
Test tachometer connectorWindshield wiper motorUnder'hood fuse/relay boxconnector A {see page 22-44)Under-hood f use/relay boxconnector B (see page 22-44)Under hood fuse/relay boxconnector C (see page 22-44)Under hood fuse/relay boxconnector D (see page 22 44)Under-hood fuse/relay box
Front of engine companmentLeft side of engine compartmentLeft side of engine compartmentLeft side o{ engine compartmentFront of engine compartmentUnder right side of cowl coverUnder'hood f use/relay boxLeft side of engine compartmentLeft side of engine companmentBehind left side of front bumperBehind left headlightBehind left side of front bumperEehind left headlightBehind left headlightBehind front bumperLeft side of engine compartmentFront of engine compartmentLeft side of engine compartment
Left side of engine companmentL.Jnder left side of cowl coverL.Jnder hood fuse/relay box
L.Jnder hood fuse/relay box
L.Jnder'hood f use/relay box
underhood fuse/relay box
Under-hood fuse/relay box
24222
2519
12
17
13202123
3
117
I
10
5
6
l2
2243,l
222223l224
252
5
12
Connector to Harness Index (cont'dl
\
22-20

Connectors and Harnesses
Connector to Harness Index (cont'd)
Engine Compartment Wire Harness (Dashboard)lcont'dl
Connector or TerminalCavitiesLocationConnectstoNotesFog light connectorUnder'dash fuse/relay boxconnector F (see page 22-45)Underdash fuse/relay boxconnector G (see page 22-45)Underdash fuse/relay boxconnector H (see page 22'45)Under-dash fuse/relay boxconnector | (see page 22'45)Under-dash fuse/relay boxconnector J (see page 22-45)c 151
c401
c451
c452
c501
c502
c502
c503
c851'14
2
3
1
I
9
6
6
5
5
12
10
112
10
3
5
8
2
'10
4
8
5
10
1
Under maddle of dashUnder left side of dash
Under left side of dash
Under left side of dash
Under left side of dash
Under left side ol dash
Under right side of dash
Under right side ot dash
Under right side ot dash
Under right side oJ dash
Under right side oI dash
Under right side ol dash
Under right side oJ dash
Under right side oJ dash
Under middle of dash
Under right side of dash
EPS subharness {see page 22-24)Dashboard wire harness B(see page 22-30)ECM wire harness (see page22-321ECM wire harness (seo page22 32)Dashboard wire harness A(see page 22-26)Dashboard wire harness Alsee page 22-261Dashboard wire harness A(see page 22-26)Dashboard wire harness A(see page 22-26)Floorwire harness (see page22-34l',VC wire harness lsee page22-43\
Oplion
Canada
USA
G4021'IEody ground via engine..mdarlma.t w,rc harncss
22-22

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UNDER-DASH FUSE/RELAY BOX
ENGINE COMPARTMENT WIRE
22-23