2003 HONDA CIVIC headlight

Fuse/Relay Boxes
Connector to Fuse/Relay Box Index
Under-hood Fuse/Relay Box
lview of tront sidel
- a-------) | | T---r .-:-tt || tL__.1 | I
------tttL""tt tt ttL lL ltl'".-
{View of back side)
SocketRefTerminalConnects to
Ay'C compressor clutch relay
B
Blower motor relay
c
Condenser fan relay
D
E
ELD unit
Headlight relay 1
Headlight relay 2
Horn relay
Radiator fan relay
Rear window defoqqer relay
14
2
15
91'
11
to
5
6
10'l
J
2
4
5
4
4
14
7
3
4
4
4
4
Engine compartment wire harness (see page 22-18)
Engine compartment wire harness (see page 22-18)
Engine compartment wire harness (see page 22-18)
Engine compartment wire harness (see page 22-18)
Engine compartment wire harness (see page 22-18)
Engine compartment wire harness {see page 22-18)
T1 (Batterv)8Starter subharness (see oaqe 22-15)
T101 (Alternator)7Starter subharness {see oaoe 22-'15}
""""-l- tr -l T _l T Il
I tTt Tr,/^-------lFrr^l -/1-l sz- l:!)L' lrt
22-44

Exterior Lights
Gomponent Location Index
UNDER.HOODFUSE/RELAY BOX
\/
HEADLIGHTSReplacement, page 22 79Adjustment. page 22-78Eulb Replacement, page 22-81
HEADLIGHT RELAY 1Test, page 22-51
HEADLIGHT RELAY 2Test, page 22-5'l
0/
FRONT SIDE MARKER LIGHTBulb Replacement, page 22 83
BRAKE PEDAL POSITIONswtTcHTest, page 22-84Adjustment, page l9'6
SIDE TURN SIGNAL LIGHTReplacement, page 22-84
FRONT TURN SIGNALLIGHTBulb Beplacement, page 22 81
PARKING LIGHTBulb Replacement, page 22-81
22-68

Exterior Lights
Daytime Running Lights Control Unit Input Test - Canada
The DRL indicator light in the gauge assembly will come on when you turn the ignition switch to ON (ll) with the
headlight switch off and the parking brake se1. lt should go off when you turn on the headlight switch and release the
parking brake. lf it comes on at any other time, do the control unit input test.
NOTE: When the daytime running lights are on, the high beam indicator will glow at half its normal intensity.
1. Remove the driver's dashboard lower cover (see page 20-60).
2, Disconnectthe l4Pconnector(A) from thedaytime running lightscontrol unit(B).
RED/BLUGNN/BLKRED/BLUGRN/BLKGRN/ORN
BLU/RED RED/YEL YEL/RED
Inspect the connector and socket terminals to be sure they are all making good contact.
. lf the terminals are bent, loose orcorroded, repairthem as necessary, and recheckthe system.
' lf the terminals look OK, go to step 4.
\
22-76

4. Make these input tests at the connector,
.lfanytestindicatesaproblem,findandcorrectthecause,thenrecheckthesystem.
. lf all the input tests prove OK, the control unit must be faulty. Replace it.
CavityWireTest conditionTest: Desired resultPossible cause if result is not obtained2R E D/BLUUnder all
conditions
Check for voltage to ground:
There should be battery voltage.
Blown No. 14 (40A) fuse in the
under-hood fuse/relay box
Blown No. 3 {10A)fuse in the
under-dash fuse/relay box
An open in the wire12YE L/RE Dlgnition switch
oN (r)Check for voltage to ground:
There should be battery voltage.
Blown No. l2 (7.5A)fuse in the
under-dash fuse/relay box
An open in the wire
BLKUnder all
conditions
Check for continuity to ground:
There should be continuitv.
. Poor ground {G50'1). An oDen in the wire7BLKUnder all
conditions
Check for continuity to ground:
There should be continuitv.
. Poor ground (G501)
' An open in the wire
10REDI/ELCombination
light switch ON/ =f\
Check for voltage to ground:
There should be battery voltage.
Blown No. 15 (15A) fuse in the
under-hood fuse/relay box
Faulty headlight relay 2
Faulty combination light switch
An open in the wire
1RED/B LUCombination
light switch ON
{iD), and
dimmer switch
in HIGH
Connect a jumper wire between
No.3 and No. 1 terminals.
Both headlights (HIGH) and
h igh beam indicator light
should come on.
Blown bulb
Faulty low beam cut relay
Faulty combination light switch
Poor ground (G50'l )
An open in the wire'11
3
RED/BLK
GRN/BLK
Combination
light switch ON(iD), and
dimmer switch
in HIGH
Com bination
light switch ON(iD), and
dimmer switch
in HIGH
Connect a jumper wire between
No. 5 and No. 11 terminals.
Right headlight (HIGH) should
come on.
Check for continulty to ground
There should be continuity.
. Blown bulb. Faulty combination light switch. Poor ground (G 50'1 ). An open in the wire
. Faulty combination light switch. Poor grou nd {G501). An open in the wire
5
6GRN/ORNParking brake
lever oulled
Check for continuity to ground:
There should be continuitv.
Faulty parking brake switch
An open in the wire
8BLU/REDCombination
light switch OFF
Check for voltage to ground:
There should be battery voltage.
Faulty headlight relays
Short to ground
An ooen in the wire
WHT/BLUlgnition switch
oN 0r)
Attach to ground:
The DRL indicator light should
come on.
. Blown No. 10 (7.5A) fuse in the
under-dash fuse/relay box. Faulty DRL indicator. An ooen in the wire
t5G RN/REDlgnition switch
oN (||)Attach to ground:
The brake system light should
come on.
Faulty brake system indicator
An open in the wire
22-77

Exterior Lights
Headlight Adjustment
Before adiusting the headlights:. Park the vehicle on a level surface.. Make sure the tire pressures are correct.. The driver or someone who weighs the same should
sit in the driver's seat.
'1. Clean the outer lens so that you can see the center
of the headlights (A).
Headlights become very hot during use; do not
touch them or any attaching hardware immediately
after they have been turned off.
22-78
7.5 m {25 ftl
\
2. Park the vehicle 7.5 m (25 ft) away from a wall or a
screen (A).
3. Open the hood.

5
Turn the low beams on.
Determine ifthe headlights are aimed properly.
Vertical adjustment:
Measure the height ofthe headlights (A). The lights
should reflect 52 mm (2.'1 in.) below headljght
height (B).
6. lf necessary, adjust the headlights to local
requirements by turning the vertical adjuster.
i
Headlight Replacement
Remove the front bumper (see page 20-85).
Disconnect the connectors (A) from the headlight(B).
Remove the five mounting bolts, then remove the
corner upper beam (C) and headlight assembly.
Install in the reverse order of removal.
After replacement, adjust the headlights to local
requirements.
'1.
2.
5.
22-79

Exterior Lights
4.
5.
Combination Light Switch Test/Replacement
1. Remove the driver's dashboard lower cover (see page 20-60).
2. Remove the steering column covers (see page 17-9).
3, Disconnectthe l6Pconnector(A) f rom the combination light switch (B).
Remove the tlvo screws, then slide out the combination light switch.
Inspect the connector terminals to be sure they are all making good contact.
. lf the terminals are bent, loose or co rroded, repa ir them as necessa ry, a nd recheck the system..lftheterminalslookOK,checkforcontinuitybetweentheterminalsineachswitchpositionaccordingtothe
tables.- lf the continuity is not as specified, replace the switch.
Light switch:
Telmint
Position451213
Headlight switch
OFF
LOWo--
HIGHo--
Passing switch
OFF
ONo-
Turn signalswitch:
Terminal
Position21011
LEFT----o
NEUTRAL
RIGHTo--
22-80

Bulb Replacement
Headlight:
1. Disconnect the 3P connector (A) from the headlight.
Headlight {high/low): 60/55 W
f-rI-'-+lA- )/
Remove the rubber cover (B).
Pull the retaining spring (C) away from the bulb (D),
then remove the bulb.
Install a new bulb in the reverse order of removal.
Make sure the notches in the bulb align with the
tabs ln the headlight.
2.
Front Turn Signal Light:
Parking Light:
1. Remove the inner fender (see page 20-102).
2. Disconnectthe connectors (A) from the lights.
21W
5W
4.
Front turn signal light:
Parking light:
Turn the bulb sockets (B) 45'counterclockwise to
remove them from the headlight housing.
Installthe new bulb(s) in the reverse order of
removat.
22-81