Mitsubishi Evolution X. Manual — part 1089
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CHASSIS ELECTRICAL
54A-717
TECHNICAL DESCRIPTION (COMMENT)
The rear window defogger is able to turn on while engine is run-
ning. If the defogger does not operate when the rear window
defogger switch is turned on, the rear window defogger relay
system may be defective.
.
TROUBLESHOOTING HINTS
• The A/C-ECU may be defective.
• The rear window defogger relay may be defective.
• The A/C control panel may be defective.
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check the A/C and outside/inside air selection
damper control motor operation.
(1) Turn the ignition switch to the "ON" position.
(2) Check the engine running.
(3) Check the operations of rear window defogger and A/C.
Q: Do the A/C and outside/inside air selection damper
control motor work normally?
YES : Go to Step 2.
NO : Refer to GROUP 55 - Inspection procedure 2,
"Malfunction of the A/C-ECU power supply system
."
STEP 2. Check rear window defogger relay connector
C-306 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is rear window defogger relay connector C-306 in good
condition?
YES : Go to Step 3.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. The
rear window defogger system should work normally.
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CHASSIS ELECTRICAL
54A-718
STEP 3. Check the rear window defogger relay continuity.
Follow the table below to check the rear window defogger relay
for continuity.
Q: Is the rear window defogger relay in good condition?
YES : Go to Step 4.
NO : Replace the rear window defogger relay. The rear
window defogger system should work normally.
STEP 4. Check rear window defogger connector F-29 and
A/C control panel connector C-123 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are rear window defogger connector F-29 and A/C
control panel connector C-123 in good condition?
YES : Go to Step 5.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. The
rear window defogger system should work normally.
STEP 5. Measure the voltage at rear window defogger
connector F-29.
(1) Disconnect rear window defogger connector F-29, and
measure the voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between rear window defogger
connector F-29 terminal No.1 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts?
YES : Go to Step 13.
NO : Go to Step 6.
Battery voltage
Terminal
number
Normal condition
With no current applied
3
− 4
No continuity
With current applied
[terminal 1 (+), terminal 2 (
−)]
Continuity exists
(2
Ω or less)
AC609147
2
3
4
1
AB
Rear window
defogger relay
AC709325 AQ
Harness side: F-29
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CHASSIS ELECTRICAL
54A-719
STEP 6. Measure the voltage at rear window defogger relay
connector C-306.
(1) Disconnect rear window defogger relay connector C-306,
and measure the voltage at the junction block side.
(2) Measure the voltage between terminal 4 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts?
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check the wiring harness between rear window
defogger relay connector C-306 (terminal 4) and the fusible
link (37).
NOTE: Also check intermediate connector C-132 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-132 is damaged, repair
or replace the connector as described in GROUP 00E, Harness
Connector Inspection
.
Q: Is the wiring harness between rear window defogger
relay connector C-306(terminal 4) and the fusible link
(37) in good condition?
YES : Check that the rear window defogger system works
normally.
NO : Repair the wiring harness. Check that the rear
window defogger system works normally.
STEP 8. Measure the voltage at rear window defogger relay
connector C-306.
(1) Disconnect rear window defogger relay connector C-306,
and measure the voltage at the junction block side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts?
YES : Go to Step 11.
NO : Go to Step 9.
AC709325 AR
Harness side: C-306
AC709325 AS
Harness side: C-306
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CHASSIS ELECTRICAL
54A-720
STEP 9. Check ETACS-ECU connector C-301 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-301 in good condition?
YES : Go to Step 10.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the rear window defogger system works normally.
STEP 10. Check the wiring harness between rear window
defogger relay connector C-306 (terminal 1) and
ETACS-ECU C-301 (terminal 12).
Q: Is the wiring harness between rear window defogger
relay connector C-306 (terminal 1) and ETACS-ECU
connector C-301 (terminal 12) in good condition?
YES : Check that the rear window defogger system works
normally.
NO : Repair the wiring harness. Check that the rear
window defogger system works normally.
STEP 11. Check the wiring harness between rear window
defogger relay connector C-306 (terminal 2) and A/C-ECU
connector C-123 (terminal 6).
Q: Is the wiring harness between rear window defogger
relay connector C-306 (terminal 2) and A/C-ECU
connector C-123 (terminal 6) in good condition?
YES : Go to Step 12.
NO : Repair or replace the wiring harness. Refer to
GROUP 00E, Harness Connector Inspection
. Check that the rear window defogger
system works normally.
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