2003 HONDA CIVIC under-dash

Turn Signal/Hazard Relay Input Test
1. Removetheturn signal/hazard relay (A) from the under-dash fuse/relay box (B).
Inspect the relay and fuse/relay box socket terminals to be sure they are all making good contact
. lf the terminals are bent. loose, or corroded, repairthem as necessary, and recheckthe system.
. lf the terminals look OK, go to step 3.
Make these input tests at the fuse/relay box.
.lfanvtestindicatesaproblem,findandcorrectthecause,thenrecheckthesystem.
. lf all the inputtests prove OK,theturn signal/hazard relay must befaulty. Replace it
000i 0!1000
00u! u0
CavitvTesl conditionTest: Desired resultPossible cause il result is not obtained
1Under all conditionsCheck for continuity to ground:
There should be continuiw.
. Poor ground (G201)
. An ooen in the wire
3lgnition switch ON ( ll)
Hazard warning switch
OFF
Check for voltage to ground:
There should be battery voltage.
' Blown No. 19 (7.5A) fuse in the
under-dash fuse/relay box. Faulty hazard warning switch. An ooen in the wire
Hazard warning switch
ON
lgnition switch OFF
Check for voltage to ground:
There should be battery voltage.
. Blown No. 5 {10A) fuse in the
under-hood fuse/relay box. Faulty hazard warning switch. An ooen in the wire
2lgnition switch ON ( ll)
and turn signal switch
in Right or Left position
Connect No. 2 terminalto No. 3
terminal:
Right or left turn signal lights
should come on.
. Poor ground (G201, G301, G501,
G502, G553). Faulty turn signal switch. An oDen in the wire
lgnition switch OFF
Hazard warning switch
ON
Connect No.2 terminal to No. 3
termrnal:
Hazard wa rning lights should
come on.
. Poor ground (G201, G301, G501,
G502, G553). Faulty hazard warning switch. An open in lhe wire
22-87

Entry Light Control System
Control Unit Input Test
1. Before testing, trou bleshoot the m u ltiplex control system (see page22-172).
2. Remove the dashboard lower cover.
3. Disconnect the under-dash fuse/relay box connectors.
NOTE: All connectors are wire side of female terminals.
UNDER.DASH FUSE/RELAY BOX CONNECTOR K Il7PI
UNDEB-DASIJ FUSE/RELAY BOX CONNECTOR O {,I2PI
UNDEB.DASH FUSE/RELAY BOX CONNECTOR P {18PI
GRN LT GRN/REO
UNOER.DASH FUSE/REI"AY BOX CONNECTOB X I8PI
1,/134578
8ED/WHT WHT/BLK
UNDER.DASH FUSE/RELAY BOX CONNECTOR Y {13PI
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 recheck the system.. lf the terminals look OK, go to step 5.
GRN/RED
3456),/18.
YEL/RED
4.
22-92

I
5. With the connectors stilldisconnected, make these input tests at the connector'
. lf anv test indicates a problem, find and correct the cause, then recheck the system. lf all the inpul tests prove OK, go to step 6.
6.Reconnect the connectors to the under dash fuse/relaV box, and make these input tests at the appropriate connectors on the under-dash
fuse/relay box.
.lfanytestindicatesaproblem,findandcorrectthecause,thenrecheckthesystem..lfalltheinputtestsproveOK,themultiplexcontrolunitmustbefaulty.Replacetheunder'dashfuse/relaYboxassemblY
CavitvWireTest conditionTest: Desired resultPossible cquse il result is not obtained
K28LU/ORNlJnder allconditionsCheck for continuity between the K2terminal and the keyless receiverunit 5P connector No. 2 terminal:There should be continuitv.
An open in the wire
o7GRN/REDCejling light switch inmiddle position.Attach to ground:Ceiling light(s)should come on.Blown No. 3 (7.5A) fuse in the under hood
Blown bulbFaulty ceiling lightAn ooen in the wire
X8WHT/BLKUnder allconditionsAttach to ground:lgnition key light should come on.Elown No.3 (7.5A)fuse in the under hoodfuse/relay boxFaulty ignition key light (LED)
An ooen in the wire
CavitvWireTest conditionTest: Desired resultPosq!!!c sq!!ej1!.9!!!!j €d
P18REDHatch openCheck for voltage to ground:There should be 1 V or less.Poor ground (G552)
Fauhy hatch latch switchAn open inthewire
Hatch closedCheck for voltage to ground:There should be 5 v or more.Faulty hatch latch switchShortto oround
Q3GRNDriver's door openCheck for voltage to ground:There should be 1 V or less.Faulty drlver's door switchAn oDen in the wire
Driver's door closedCheck for voltage to ground:Thar. shoul.l he 5 V or more.Faulty driver's door switch
o4LT GRN/BED
RED^vHT
Passenger's doorCheck for voltage to ground:There should be 1 V or less.
' Faulty passenger's door switch' An onen inthewire
Passenger's doorcroseoCheckfor voltage to ground:There should be 5 Vor more.
. Faulty passenger's door switch. Shor o oround
X5lgnition key insertedinto the ignitionCheck for voltage to ground:There should be 1 V or less.Poor ground (G401)
Faulty ignition key switchAn ooen in the wire
lgnition key removedfrom the ignitionCheck for voltage to ground:There should be 5 V or more.Faulty ignition key switchShort to ground
Y8YEUREDDriver's door lockknob switch lockedCheck for voltage to ground:There should be 1 V or less.Poor ground {G501)Faulty driver's door lock knob switchAn ooen in the wire
Driver's door lockkn6h cwirch Inl6cke.lCheck for voltage to ground:There should be 5 V or more.Faulty driver's door lock knob switchShort to oround
22-93

Rear Window Defogger
Function Test
NOTE:. Be careful not to scratch or damage the defogger
wires with the tester probe.
. Before testing, check the No. 11 (30A) fuse in the
under-hood fuse/relay box and No. '14 ('10A) fuse in
the under-dash fuse/relay box.
1. Check for voltage between the ve rtica I dividersand
body ground with the ignition switch and defogger
switch ON.
There should be voltage as shown.
. lf there is no voltage. checkfor:- faulty defogger relay.- an open in the BLK, BLK,/YEL, or YEL/BLK wire.- taulty heater control panel.
. lf there is battery voltage, goto step 2.
6V
Check for continuity between the negative terminal(B) and body ground.
lf there is no continuity, check for:. an open in the BLK wire.. Poor body ground at the window antenna coil
mounting bolt.
Touch the voltmeter positive probe to the halfway
point of each defogger wire. and the negative
probe to the negative terminal,
There should be about 6 V with the ignition switch
and the defogger switch ON.
. lf thevoltage is asspecified, the defoggerwlre is
oK.. lf the voltage is not as specified, repair the
defogger wire.- lf it is more than 6 V, there is a break in the
negative half of the wire.- lf it is less than 6 V, there is a break in the
positive half of the wire.
2.
22-106
2.
Defogger Wire Repair
NOTE: To make an effective repair, the broken section
must be no longer than one inch.
1. Lightly rub the area around the broken section (A)
with fine steel wool, then clean it with alcohol.
Carefully mask above and below the broken portion
of the defogger wire (B) with transparent tape {C).
Mix the silver conductive paint thoroughly. Using a
small brush, apply a heavy coat of paint extending
about 1/8 inch on both sides of the break. Allow 30
minutes to dry.
Check for continuity in the repaired wire.
Apply a second coat of paint in the same way. Let it
dry 3 hours before removing the tape.
5.

Power Mirrors
Function Test
1. Remove the driver's pocket (see page 20-60).
2. Reach through the pocket opening, and push out
the power mirror switch (A).
,\
RED B
Wire side oftemale terminals
WHT/RED
RED/YEL
3. Disconnectthe'13P connector (B) from the switch.
4. Choose the appropriate test based on the
symptom:. Both mirrors don't work, go to step 5.. Left mirror doesn't work, go to step 7.. Right mirror doesn't work, go to step 8.. Defogger doesn't work (Canada), go to step 9.
Both mirrors
5. Check for voltage between the No. 2 terminal and
body ground with the ignitlon switch ON (ll).
There should be battery voltage.. lf there is no battery voltage, check for:- blown No. 14 (10A) fuse in the under'dash
fuse/relay box.- an open in the BLKryEL wire.. lf there is battery voltage, goto step 6.
6. Check for continuity between the No. 6 terminal
and body ground.
There should be continuity.. lf there is no continuity, check for:- an open in the BLK wire.- poor ground (G501).
. lf there is continuity, check both mirrors
individually as described in the next column.
RED/BLK
22-116
Left mirror
7. Connect the No. 2 terminal totheNo. l0terminal,
and the No. 5 (or No. 12) terminal to the No. 6
terminal with jumper wires. The left mirror should
tilt down (or swing left)with the ignition switch ON
fl r).. lf the mirrordoes nottiltdown (ordoes notswing
left), check for an open in the GRN/WHT (or BLU/
Wl-lT)wire between the left mirror and the 13P
conneclor, lf the wire is OK, check the left m irror
actualor.. lf the mirror neithertilts down nor swings left.
repair the BLU/BLK wire.. lf the mirrorworks properly, checkthe mirror
SWIICN,
Right mirror
8. Connect the No. 2 terminalto the No. 11 terminal,
and the No. 5 {or No. 13) terminal to the No. 6
terminal with jumper wires. The right mirror should
tilt down (or swing left)with the ignition switch ON
(

).. lf the mirror does not tilt down (or does not swing
left), check for an open in the GRN/WHT (or WHT/
RED)wire between the right mirror and the 13P
connector.
lf the wire is OK, check the right mirror actuator.. lf the mirrorneithertiltsdown norswings left,
repalr the RED|YEL wire.' lf the mirrorworks properly. checkthe mirror
swrrcn.
Defogger (Canada)
9. Connect the No. 1 and No. I terminals with a
jumper wire, and check for voltage between the
No. 2 terminal of the mirror connector and body
ground. There should be battery voltage and both
mirrors should warm up with the ignition switch
oN

t).. lf there is novoltage orneitherwarms up, check
for:- an open in the BLKI/EL or oRN wire.- blown No. 14 ('l0A)fuse in the under-dash
fuse/relay box.. lf only one fails to warm up, check:- its defogger.- poor ground (G501, G502). lf both warm up, checkthedefoggerswitch.

4. Withthe connector still disconnected, makethese inputtests attheconnector.
.lfanytestindicatesaproblem,findandcorrectthecause.thenrecheckthesystem.
. lf allthe inputtests prove OK, goto step 5.
5. Reconnect the 14P connector to the switch, and perform the following input tests.
.lfanytestindicatesaproblem,findandcorrectthecause,thenrecheckthesystem.
. lf all the input tests prove OK, the control unit must be faulty. Replace the power window master switch.
CavityWireTest conditionTest: Desired resultPossible cause if result is not
obtained
10BLKUnder all conditionsCheck for continuity to
grouno:
There should be continuity.
. Poor ground {G50'1). An open in the wire
14
11G RN^,^/HTlgnition switch ON (ll)Check for voltage to
ground:
There should be battery
voltage.
Blown No.6 (7.5A) fuse in
the under-dash fuse/relay
box
Blown No. 22,23 l2OA) tuse
in the under-dash fuse/
relay Dox
Faulty power window relay
Poor ground (G201)
An open in the wire
2GRN/BLK
1RED/YELConnect the No. 'l'1 and
No. 7 terminals, and the
No, 4 and No. 14 terminals,
and turn the ignition switch
oN flr).
Check for driver's window
molor operaflon:
It should run (the driver's
window moves down).
. Faulty driver's window
motor. An open in the wireRED/B LK
3BLU/REDConnect the No. 2 and No. 1
terminals, and the No. 3
and No. 10 terminals, and
turn the ignition switch ON
fi r),
Check for passenger's
window motor operation:
It should run (the
passenger's window moves
oown).
Faulty passenger's window
motor
Faulty passenger's window
swatch
An open in the wire
BLU/WHT
CavityWireTest conditionTest: Desired resultPossible cause if result is not
obtained
13ORNConnect the No. 11 and
No. 7 terminals, and the
No. 4 and No. 14 terminals,
and turn the ignition switch
oN 0r).
Check for voltage between
the No. 13 and No. 14
termtnals:
About6Vshouldbe
indicated with the driver's
window motor running.
. Faulty driver's window
molor. An open in the wire
22-127

Power Windows
1.
2.
Passenger's Window Switch Input Test
Remove the switch panel (see page 20-4).
Disconnect the 5P connector (A) from the switch (B).
o
'' "'"1.
4.
Wire side of female terminals
BLU/WHTGRN/BLK
Input the connector and socket terminals to be sure they are all making good contact.
. lf theterminals are bent, loose or corroded, repairthem as necessary, and recheckthe system.. lf the terminals look OK, go to step 4.
Reconnect the connector, and using a back probe, make these input tests at the connector. lf any test indicates aproblem, find and correct the cause, then recheck the svstem,
CavitvWireTest conditionTest: Desired resultPossible cause if result is not obtained
3GRN/BLKlgnition switch ON
{ ll)
Check for voltage to
grouno:
There should be battery
voltage.
Blown No.6 (7,5A)fuse in the
under-dash fuse/relay box
Blown No.22 {20A)fuse in the
under-dash fuse/relay box
Faulty power window relay
An open in the wire
Poor qround (G201)
2BLD,A/VHTlgnition switch ON( )
At the master
window switch,
press and hold
down the
passenger's switch
Check for voltage to
ground:
There should be battery
voltage.
Faulty master window switch
An open in the wire
BLU/REDlgnition switch ON(||)
At the master
window switch,
pull up and hold
the passenger's
switch
Check for voltage to
grouno:
There should be battery
voltage.
Faulty master window switch
An open in the wire
22-130

\
4. With the connector still disconnected, makethese input tests at the con necrors.
.lfanytestindicatesaproblem,findandcorrectthecause,thenrecheckthesystem.
' lf all the input tests prove OK, the control unit must be faultv. Replace it.
CavitvWireTesl conditionTest: Desired resultPossible cause if result is not obtainedGRNlgnition switch ON
flr)
Check for voltage to ground:
There should be battery
voltaqe.
. Blown No.9 (10A)fuse in the
under-dash fuse/relay box. An open in the wire10BLKUnder all
conditions
Check for continuity to
grouno:
There should be continuitv.
Poor ground (G553)
An open in the wire
6WHT/REDlgnition switch ON(ll) and rear
window washer
switch ON
Check for voltage to ground:
There should be battery
vortage.
Blown No.9 (10A) fuse in the
under-dash fuse/relay box
Faulty rear wlndow wiper/
washer switch
An open in the wire4LT GRN/
RED
lgnition switch ON(ll) and rear
window wiper
switch ON
Attach to groundl
The rear window wiper motor
should run.
LT GRNlgnition switch ON
flr)
Attach to ground:
The rear window wiper motor
should run.
Blown No. 9 (10A)fuse in the
under-dash fuse/relay box
Faulty rear window wiper motor
An open in the wire20LT GRN/
BLK
lgnition switch ON(ll)Check for voltage to ground:
There should be battery
voltage.
Blown No.9 (10A) fuse in the
under-dash fuse/relay box
Faulty rear window wiper motor
An oDen in the wire
22-139