Ignition switch HONDA CIVIC 2003 7.G Workshop Manual

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DTC Troubleshooting
DTC 11, 13, 15, 17: Wheel Sensor
(Open/Short to Body Ground/Short to Power)
1. Disconnect the ABS control unit 31P connector.
2. Sta rt the engine.
3. Measure the voltage between the appropriate
wheel sensor (*)circuitterminal of theABS
control unit 31P connector and body ground (see
table).
DTCADpropriate Terminal
11 (Rioht-front)No.5: FRS (t)
13 (Left-front)No, 7: FLS (*)
15 {Riqht-rear}No. 2: RRS (*)
17 (Left-rear)No.9 RtS (f )
ABS CONTROL UNIT 31P CONNECTOR
FRS {+IIGNR/BLK} FLS I+I (BLU
RRS {+)(GNR/YEL)
Wire side of female terminals
ls thete battery voltage?
YES Repair short to power in the (+) circuit wire
between the ABS modulator-control unit and the
appropriate wheel sensor. I
NO Go to step 4.
4. Turn the ignition switch OFF.
5. Check for continuity between the appropriate
wheel sensor (+ ) circuit terminal and body ground
{see table).
DTCAppropriate Terminal
11 (Riqht-front)No. 5: FRS (+)
13 (Left-front)No. 7: FLS (*)
15 (Rioht-rear)No.2: RRS (*)
17 (Left-rear)No.9 RLS (+l
ABS CONTROL UNIT 31P CONNECTOR
Wire side
ls there continuity?
YES Go to step 6.
NO-Go to step 7.
Disconnect the harness 2P connector from the
appropriate wheel sensor, then check for continuity
between the 1+)and ( )terminals ofthe harness
and body ground.
ls there continuity?
YES-Repair shortto body ground in the (+)or { )
circuit wire between the ABS modulator-control
unit and the wheel sensor.l
NO Repiace the wheel sensor.l
(cont'd)
Wire side of female terminals
19-45

DTC 54: Main Relay Stuck OFF
1. Checkthe No.8 (20A) fuse in the under-hood fuse/
relay box, and reinstallthe fuse if it is OK.
ls the f use OK?
YES-Go to step 2.
NO Replace the fuse, and recheck.l
2. Disconnect the ABS control unit 31P connector.
3. l\4easure the voltage between the ABS control unit
connector terminal No. 18 and body ground.
ABS CONTROL UNIT 31P CONNECIOR
Wire side of female terminals
Is there battety voltage?
YES Replace the ABS modulator-control unit.l
NO-Repair open in the wire between the ABS
control unit and the under-hood fuse/relay box.I
DTC 61: lG2 Voltage
NOTE: Check the No. 11 (7.5A) fuse in the under-dash
fuse/relay box before troubleshooting.
1. Clear the DTC, then disconnect the Honda PGM
tesler.
2. Test drive the vehicle.
Doesthe ABS indicator come on and is DTC 61
ind icated ?
YES Go to step 3.
NO The system is OK at this time.l
3. Disconnect the ABS control unit3lPconnector.
4. Turn the ignition switch ON (ll).
5. Measure the voltage between the ABS control unit
31P connectorterminal No. 15 and body ground.
ABS CONTROL UNIT 31P CONNECTOR
ls there battery voltage?
YES Replace the ABS modulator-control unit.l
NO - Repair open in the wire between the ABS
control unit and the under-hood {use/relay box.l
Wire side of female terminals
19-51

ABS Components
DTC Troubleshooting (cont'd)
DTC 81: CPU (Central Processing Unit)
1. Clear the DTC, then disconnect the Honda PGM
Tester.
2. Test-drive the vehicle.
Does the ABS indicator come on and is DTC 81
indicated ?
YES Replace the ABS modulator-control unit.l
NO-The system is OK at this time. t
19-52
ABS Indicator Gircuit
Troubleshooting
ABS indicator does not come on
1. Turn the ignition switch ON (ll), and watch the ABS
indicator.
Does the ABS indicator come on?
YES The system is OK at this time.I
NO Go to step 2,
Pull up the parking brake lever.
Does the btake system indicator come on?
YES Go to step 3.
NO Repair open in the indicator power source
circuit. lf necassary, substitute a known-good ABS
modulator-control unit, and recheck. I. Blown No, 10 (7.5A) fuse.. Open in the wire between the No. 10 (7.5A)fuse
and lhe gauge assembly,. Open circuit inside the fuse box.
Turn the ignition switch OFF.
Disconnect the ABS control unit 31P connector.
Turn the ignition switch ON (ll).
Does the ABS indicator come on?
YES-Check for loose terminals in the ABS control
unit 31P connector. lf necessary, substitute a
known-good ABS modulator-control unit, and
recheck.l
NO Go to step 6.
Turn the ignition switch OFF.
Remove the gauge assembly (see page 22-64).
3.
5.
6.
7.

ABS Components
5.
6.
ABS Indicator Circuit Troubleshooting (cont'dl
Turn the ignition switch ON (ll).
Measure the voltage between the ABS control unit
31P connector termina I No. 15 and body ground.
ABS CONTROL UNIT 3IP CONNECTOR
Wire side of female terminals
Is there battety voltage?
YES-Go to step 7.
NO-Repair open in the wire between the No. 11(7.5A) fuse and the ABS control unit.I
Turn the ignition switch OFF.
Check for continuity between the ABS control unit
31P connector terminal No. 19 and body ground.
ABS CONTROL UNIT 31P CONNECTOB
Wire side ot Iemale terminals
ls there continuity?
YES Go to step 9.
NO-Repair open in the wire between the ABS
control unit and body ground (G202). t
9. Turn the ignition switch ON (ll).
1.
8.
19-54
10. Connect the ABS control unit3lPconnector
terminal No.20 and body ground with a jumper
wire.
ABS CONTROL UNIT 31P CONNECTOR
Wire side of female terminats
Does the ABS indicator go off?
YES-Check for loose terminals in the ABS control
unil 31P connector. lf necessary, substitute a
known-good ABS modulator-control unit, and
recheck.I
NO Go to step 1 1.
Remove the gauge assembly, and leave the
connectors connected. Connect the gauge
assembly connector A (22P) terminal No. '12 and
body ground with a jumper wire.
GAUGE ASSEMBLY CONNECTOR A (22P)
\'l '1.
Wire side of female terminals
Does the ABS indicator go off?
YES-Repair open in the wire between the gauge
assembly and the ABS control unit.I
NO-Check for loose gauge assembly connectors.
lf the connectors are OK, replace the printed circuit
board in the gauge assembly.l

Brake System Indicator Gircuit Troubleshooting
Brake system indicator does not come on
'1. Discon nect the m ultiplex contro I unit l3Pconnector
and the ABS control unit 31P connector.
2. Check for continuity between the ABS control unit
3l P connector terminal No,21 and bodyground.
ABS CONTROL UNIT 31P CONNECTOR
Wire side of female terminals
ls there continuity?
YES Repair short to body ground in the wire
between the multiplex control unit and the ABS
control unit.l
NO Go to multiplex control system
trou bleshooting lsee page 22''172).a
Brake system indicator does not go off
1. Turn the ignition switch ON {ll).
2. Release the parking brake.
Does the brake system indicatot go ofl after
several seconds?
YES The system is OK at this time.l
NO Go to step 3.
3. Check the brake fluid level.
ls the level OK?
YES Go to step 4.
NO Refill the brake fluid, and recheck.l
4. Check the ABS indicator.
Does the ABS indicator stay on?
YES Read the ABS DTC (see step 1 on page 19-32).
and do the applicable troubleshooting for the DTC
NO Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the ABS control unit3lPconnector.
7. Connect the ABS control unit 31P connector
terminal No. 21 and body ground with a jumper
ABS CONTROL UNIT 31P CONNECTOR
(cont'd )
Wire srde of lemale lerminals
19-55

ABS Components
8.
9.
10.
11.
12.
13.
Brake System Indicator Gircuit Troubleshooting (cont'd)
Turn the ignititon switch ON (ll).
Check the brake system indicator.
Does the brake system indicatot go off?
YES-Replace the ABS modulator-control unit.l
NO-Go to step 10.
Turn the ignition switch OFF.
Connect the multiplex control unit 13P connector
terminal No. 'l and body ground with a jumper wire.
MULTIPLEX CONTROL UNIT 13P CONNECTOR
JUMPERWIRE
Wire side of female terminals
Turn the ignition switch ON (ll).
Check the brake system indicator.
Does the btake system indicatot go off?
YES Repair open in the wire between the
multiplex control unit and the ABS control unit.l
NO Go to multiplex control system
troubleshootin g (see page 22-17 2). a
19-56
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ABS Modulator-Control Unit Removal and lnstallation
NOTE:. Donotspill brake fluid on the vehicle; it may damage the painU if brakefluidgetsonthepaint,washitoff
immediately with water.. Becareful not to damage or deform the brake lines during removal and installation.. To prevent the brake fluid from flowing, plug and cover the hose ends and joints with a shop towel orequivalent
malenal.
Removal
'1. Turn the ignition switch OFF.
2. Pull upthelock(A) oftheABScontrol unit3lPconnector(B),thendisconnecttheconnector.
FLARE NUTl5 N.m (1.5 kgt.m,11 lbt.ftl
6)o
CII mm NUT8.8 N.m {0.9 kgl m.6.5lbf ft)
6 mm BOLT9.8 N.m11.0 ksf.m,7.2lbf.ft)
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--/Q \,
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(cont'd)
19-57

Heating and Air Conditioning
General Troubleshooting Information
How to Retrieve a DTC
The heater control panel has a self-diagnosis function. To run the self-diagnosis function, do the following:
1. Turn the fan switch OFF.
2. Pressand holdthe recirculation control switch andthe rear window defoooer switch down.
3. Turn the ignition switch oN {lli.
4. Release both switches. The recirculation indicator and the rear window defogger indicator come on. The
recirculation indicator goes off 3 seconds later and the Ay'C indicator comes on. then the self-diagnosis will begin.
About 10 seconds later, the self-diagnosis will finish and the A,/C indicator goes off.
.lfanytroubleisfound.therecirculationindicatorblinksthediagnostictroublecode(DTC)toindicateafaulty
circuil or comDonent.. lf the system is OK, the recirculation indicator stays off.
atc
@r
RECIRCULATIONCONTROL SWITCH
BECIRCULATIONINDICATOB
/A\
-:@
INOICATOR
REAR WINDOWOEFOGGER INDICATOR
REAR WINDOWDEFOGGER SWITCH
Examole of DTC indication Pattern IDTC 7)
DTC 7
Reseiting the Selt-diagnosis Function
Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnosis
function aoain to make sure thatthere are no other malfunctions.
Recirculation +indicatot
Recirculation +indicalorgo6s oft----->
21-8

5. Turn the ignition switch ON (ll), and check the same
terminals for voltage.
HEATER CONTROL PANEL CONNECTOR A {14PI
HEATER CONTROL PANEL CONNECTOR B I22PI
Wire side of female terminals
ls there any voltage?
YES-Repair any short to power in the wire(s)
between the heater control panel and the air mix
control motor. This short may also damage the
heater control panel. Repair the short to power
before replacing the heater control panel.l
NO Substitute a known-good air mix control
motor, and recheck. lf the symptom/indication goes
away, replace the original air mix control motor. lf
the symptom/indication continues, substitute a
known-good heater control panel, and recheck. lf
the symptom/indication goes away, replace the
original heater control panel.I
Wire side of female terminals
DTC 9: A Problem in the Air Mix Control
Linkage, Door, or Motor
1, Test the air mix control motor (see page 21-34).
ls the air mix control motor OK?
YES-Substitute a known-good heater control
panel, and recheck. lf the symptom/indication goes
away, replace the original heater control panel.l
NO-Replace the air mix control motor, or repair
the linkage and door.l
21-17

Heating and Air Conditioning
DTC Troubleshooting.(cont'd)
DTC 10: An Open or Short in the Mode
Control Motor Circuit
1. Test the mode control motor (see page 21-35).
ls the mode cottol motor OK?
YES Go to step 2.
NO Replace the mode control motor.I
Disconnect the mode control motor 10P connector.
Disconnect heater control panel connectors A (14P)
and B \22P1.
Check for continuity between body ground and
heater control panel connector A (14P) terminals
No. 2, 10, and 11 individually, and between body
ground and heater control panel connector B (22P)
terminals No. '17, 18, 19, and 20 individually.
HEATER CONTROL PANEL CONNECTOR A {14PI
2.
3.
Wire side ol lemale terminals
ls there continuity?
YES Repair any shortto body ground in the
wire(s) between the heater control panel and the
mode control motor.l
NO Go to step 5.
HEATER CONTROL PANELCONNECTOR B {22P)
Wire side of femaLe lerminals
21-18
5. Turn the ignition switch ON (ll), and check the same
terminals for voltage.
HEATEB CONTROL PANEL CONNECTOR A {14P)
Wire side of female terminal
HEATER CONTROL PANEL CONNECTOR B {22PI
35X6
tl1215T61118t92A2122
RED/YELWHT
Wire side of female terminals
ls there any voltage?
YES-. Repair any short to power in the wire(s)
between the heater control panel and the mode
control motor. This short may also damage the
heater control panel. Repair the short to power
before replacing the heater control panel.l
NO- Go to step 6.