2002 HONDA CIVIC headlights

ldle Control System
DTC Troubleshooting
DTC P0505: ldle Control System Malfunction
NOTE: lf DTC P1519 is stored atthe same time as DTC
P0505, troubleshoot DTC P1519 first, then recheck for
DTC P0505.
1. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle,
2. Checkthe engine speed at idle with no,load
conditions: headlights, blower fan, rear defogger,
radiator fan, and air conditioner off.
Is the engine running at 750t50 rpm?
YES - Intermittent failure, system is OK at this
trme.I
NO lf the idle speed is less than 700 rpm, go to
step 3; if it's 800 rpm or higher, go to step 4.
3. Disconnect the idle air control {lAC) valve3P
connector.
Does the engine speed increase or fluctuate?
YES- Check the idle speed {see page 1 1-138). lf the
idle will not adjust properly, clean the passage in
the throttle body, and then adjust the idle. I
NO- Replace the IAC valve.I
4. Turn the ignition switch OFF.
5. Remove the intake air duct from the throttle body.
6. Start the engine, and let it idle.
11-130
(
7. Put your fingers on the lower pon (A) inthethrottle
oooy.
Does the engine stall?
YES Checkthe idle speed (see page 11-138). lfit's
out of specification, replace the IAC valve.l
NO With the throttle valve completely closed,
check for vacuum leaks, and repair as necessary.l

ldle Gontrol System
't.
Alternator FR Signal Circuit Troubleshooting
Disconnect the alternator 4P connector from the
alternalor.
Turn the ignition switch ON {ll).
Measure voltage between ECM connector
terminals 424 and 813.
ECM CONNECTORS
2.
3.
A l31Pl
1 21345611 | 1.,'I
1011112,/56,/r8119l2C21
2312428129130
L(BRN/YEL)
ALTF(WHT
213 4t561
89ltal,/l/15
Wire side of female terminals
ls there about 5 V?
YES Go to step 4.
NO-Go to step 13.
4. Turn the ignition switch OFF.
5. Reconnect the alternator 4P connector.
6. Slan the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle.
7. lvleasure voltage between ECM connector
terminals A24 and B 13.
Does the voltage decrease when the headlights
and rear window defogger arc tutned on?
YES The alternator FR signal is OK.l
NO-Go to step 8.
8. Turn the ignition switch OFF.
9. Disconnect ECM connector B (24P).
10. Disconnect the alternator 4P connector.
/REDI
11-134
'11. Connect alternator 4P con necto r term inal No.4 to
body ground with a jumper wire.
ALTERNATOR 4P CONNECTOR
12
ALTF34IWHT/RED)
JUMPER WIRE
12.
Wire side of female terminals
Check for continuity between body ground and
EClvl connector terminal 813.
ECM CONNECTOB B (24PI
Wire side of female terminals
ls there continuity?
YES-Testthe alternator (see page 4-22).1
NO Repair open in the wire between the ECM(B 13) and the alternator.l
Turn the ignition switch OFF.
Disconnect ECM connector B (24P).
\
13.
't 4.

ldle Control System
ldle Speed lnspection
NOTE:' Leave the idle air control (lAC) valve connecled.. Before checking the idle speed, check these items:- The malfunction indicator lamp (MlL) has not been
reported on.- lgnition timing- Spark plugs- Air cleaner- PCV system. Pullthe parking brake lever up. Start the engine, and
make sure the headlights are off.
1. Disconnect the evaporative emission (EVAP)
canister purge valve 2P connector.
2. Connect a tachometer (A)to the test tachometer
connector (B), or connect the Honda PGM Tester (C)
or an OBD ll scan tool to the data link connector(DLC) (D) located under the driver's side of the
dashboard.
11-138
4.
3.
5.
6.
Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle.
Check the idle speed with no-load conditions;
headlights, blower fan, radiator fan, and air
conditioner off.
ldle speed should be: 750 t 50 rpm
Let the engine idle for 1 minute with the heater fan
switch on Hl and air conditioner on, then check the
idle speed.
ldle speed should be: 750 t 50 rpm
NOTE: lf the idle speed is not wilhin specification,
go to the Symptom Troubleshooting Index,
Reconnect the EVAP canister purge valve 2P
connector.

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

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

Keyless/Power Door Lock System
Control Unit Input Test (cont'dl
5. Reconnect all connections to the underdash fuse/relay box, and make these input tests at the appropriate connectors on the under-dashfuse/relay box.
'lfanytestindicatesaproblem,findandcorrectthecause,thenrecheckthesystem.. lf all the inputtests prove OK, goto step 6.
CavitvWireTest conditionTest: Desired resultPossible ca use if result is notobtainedc1'l8LUUnder all conditionsAftach to ground:Parking, side marker, licenseplate lights, and tajllights shouldcome on.
Blown No.2 (15A)fuse in the underhood fuse/relay boxFaulty taillight relayFaulty under-dash fuse/relay boxAn onen in rhc wireBLU/BEOUnder all conditionsAttach to ground:Headlights should come on.Blown No. 15 or 17 (15A)fuse in theunderhood fuse/relay boxFaulty headlight relay '1 or 2An ooen in the wireJ2WHT/REDUnder all conditionsCheck for voltage to ground:There should be battery voltage.Blown No.9 (15A)fuse in the under-hood fuse/relay boxAn oncn in thc wircBLKUnder all conditaonsCheck for voltage to ground:Thcre shouln hc 1 V or lpqsPoor ground (G501)An ooen in the wireJ6OBNUnder allconditionsAttach to ground:The horns should sound.Blown No. 7 (15A)fuse in the underhood fuse/relay boxFaulty horn relayFaulty hornsAn 6nen in rhe wireJ7Under all conditionsCheck for voltage to ground:There should be battery voltage.Elown No. 16 (20A)fuse in the underhood fuse/relay boxAn oocn in ihc wi.cP18BEDHatch openCheck for voltage to ground:There should be 1 V or less.Poor ground (G552)Faulty hatch latch switchAn oncn in rhc wirFHatch closedCheck for voltage to groundlThere shoul.l he 5 V or moreFaulty hatch latch switch
GBNDriver's door openCheck for voltage to g.ound:There should be 1 V or less. Faulty driver's door switch. An ooen in the wireDriver's door closedCheck for voltage to ground:There should be 5 V or more.Faulty driver's door switchShort to oroundo4LT GRN/REDPassenger's door openCheck for voltage to ground:There should be 1 V or less.Faulty passenger's door switchAn ooen inthewirePassenger's door closedCheck for voltage to groundlThere should be sVor more
. Faulty passenger's door switch. Short to oroundX5REDAVHTlgnition key inserted intothe ignition swhchCheck for voltage to ground:There should be 1 V or less.Poor ground {G401)Faulty ignition key switchAn ooen inthewirelgnition key removed fromrhe ionition switchCheck for voltage to ground:There should be 5 V or more.Faulty ignition key switchShort to oroundY1WHT/BLKDriver's door lock knobswitch unlockedCheck for voltage to groundlThere should be 1 V or less.Poorground (G50'l)Faulty driver's door lock knob switchAn open in the wireDriver's door lock knobCheck for voltage to groundlIhere should be 5 V or more.Faulty driver's door lock knob switchShort to oroundY8YEUREDDriver's door lock knobswitch lockedCheck for voltage to groundlThere should be 1 V or less.Poorground (G50'l)Faulty driver's door lock knob switchAn oncn inihewireDriver's door lock knobswitch unlockedCheck for voltage to ground:There should be 5Vor more' Faulty driver's door lock knob sw;tch. Shorr to oroundY10WHT/GRNDrtver's door lock switchunlockedCheck for voltage to groundlThere should be 1 V or less.Poorground (G501iFaulty driver's door lock switchAn ooen in the wireDriver's door lock switch inCheck for voltage to ground:Therc shorl.l be 5V or m6rpFaulty driver's door lock switchShort to o rolrndY12WHT/BLUDriver's door lock switchlockedCheck for voltage to ground:There should be 'l V or less.Poor ground (G501)Faulty driver's door lock switchAn oDen in the wireDriver's door lock switch inCheck tor voltage to ground:There should be 5Vor moreFaulty driver's door lock switch
22-156
J