2003 HONDA CIVIC Circuit

Gauges
2.
3.
Gauge Assembly Replacement
1.Remove the instrument panel (see page 20-59),
then remove the upper column cover {see page 17-
Place a clean shop towel (A) under the gauge
assembly to prevent scratching the steering
colum n or dash panel.
Remove the screws from the gauge assembly (B).
Disconnect the connectors (C), and remove thegauge assemDry.
Installthe gauge assembly in the reverse order of
removal.
Coolant Temperature Gauge
Troubleshooting
Before testing, check the No. I { 10A) fuse in the under-
hood fuse/relay box and the No. '10 (7.5A) fuse in the
under dash fuse/relay box.
1. Start the engine, and check the malfunction
indicator lamp (MlL).
Does the MIL come on?
YES- Troubleshoot the cause of the ECM DTC (see
page 1 1-57), and recheck.
NO-Go to step 2.
2. Check for a multiplex control unit DTC (see page
22,168).
ls a DTC ind icated?
YES Troubleshooting the cause of the multiplex
control unit DTC {see page 22-168), and recheck.
NO Go to step 3.
3. Do the communication line check with the self-
diagnosis procedure (see page 22-56).
ls the word "Error" indicated on the odo/ttip
d isplay ?
YES The gauge cannot receive the signal from the
multiplex control unit and the ECI\,4. Check for an
open in the WHT/GRN wire (gauge connector
terminal B 13). lf no open is found, go to step 5.
NO Go to step 4.
4. Do the gauge drive circuit check with the self-
diagnosis procedure (see page 22-56).
Does the temperature gauge needle sweep lrom
the minimum position to the maximum, then tetutn
to the minimum position?
YES Go to step 5.
NO Replace the gauge assembly.l
5. Substitute a known-good ECM and recheck.
Did the symptom/ ind ication go away?
YES Replace the ECM.
NO Substitute a known good gauge assembly. lf
the symptom/indication goes away, replace thegauge assembly.l
4.
22-64

IVehicle Speed Signal Circuit Troubleshooting
Special Tools Required:
Test Harness 07LAJ-PT3020A
Before testing, inspect the No. 4 (10A) and No. 10 (7.5A)
fuses in the under-dash fuse/relay box.
1. Disconnect the 3P connector from the vehicle
speed sensor (VSS) {A).
Connect the test harness only to the engine wire
harness.
Connect the RED test harness clip (B) to the positive
probe of an ohmmeter. Cover the white (C) and
green {D) test harness leads with protective tape (E).
Check for continuity between the RED test harness
clip and body ground,
ls there continuity?
YES Go to step 5.
NO Repair open in the BLK wire between the VSS
and G 101.I
3.
4.
5. Connect the WHT test harness cliD (B) to the
positive probe of a voltmeter, and connect the RED
test harness clip (C) to the negative probe.
Turn the ignition switch ON (ll).
le thara h2ltarv v^ltada?
YES-Go to step 7.
NO Repair open in the BLK,/YEL wire between the
VSS and the under-dash fuse/relay box.l
Disconnect the WHT test harness clip (B).
Connect the GRN test harness clip {D) to the
positive probe of a voltmeter.
Is there 5 V or more?
YES- Go to step 9.
NO Repair short or open in the BLUMHT or WHT/
GRN wire between the VSS and the cruise control
unit, or the ECM.I
(cont'd)
7.
8.
22-65

Gauges
9.
10.
Vehicle Speed Signal Circuit Troubleshooting (cont'dl
Turn the ignition switch OFF.
Connect the other test harness connector (A) to the
VSS (B),
11.Raise the front of the vehicle, and make sure it is
securely supported.
Put the vehicle in neutral with the ignition switch
oN {|| ),
Slowly rotate one wheel with the other wheel
blocked.
Does voltage pulse ttom 0 to about 5 V ot morc?
YES Go to step 14.
NO Replace the VSS.I
't2.
t5.
22-66
14. Disconnect the 22P connector "8" from the gauge
assemDry.
GAUGE ASSEMBLY CONNECTOR B (22P)
Wire side ot female terminals
'15. Connect the positive probe of a voltmeter to the
BLU/WHT wire and the negative probe to ground.
'16. Slowly rotate one wheel with the other wheel
blocked.
Does voltage pulse f rom 0 to about 5 V or more?
YES - Replace the speedometer assembly.I
NO Repair open in the BLUMHTwiTe between
the VSS and the speedometer.l

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Exterior Lights
tCircuit Diagram - Canada
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22-72

Exterior Lights
\Circuit Diagram - Brake Lights
UiDEN HOODFUSE/NEUYBOXSATIISYI r!o7l15A) | ,r-T-v--rrni'citr
22-7 4

Circuit Diagram - Back-up Lights
UiDEN H@D FUSI/8EIAY 80)(
22-75

Turn Signal/Hazard Flasher
UNDff HOOD FUSUftIIY 8OX
Circuit Diagram\
'No20lr0A USAUt oEB DASH No.2{ l50A) :CmadaTUSVRILAY 8OX
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INDICATONIIGHT11.1W)
fiIGHT T
FBONT
22-86
!

Entry Light Control System
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'No.20({0A) USA
Circuit Diagram
CEILINGUGHT
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ORIVEBSDOORSWITCH
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22-90