Mitsubishi Outlander XL. Manual — part 1199
INSPECTION PROCEDURE 9: Rear window defogger does not operate.
M15502000918USA0000010000
Rear Window Defogger Circuit
REAR
WINDOW
DEFOGGER
RELAY
RELAY BOX
REAR WINDOW
DEFOGGER
FUSIBLE
LINK
37
ETACS-ECU
REAR
WINDOW
DEFOGGER
SWITCH
INTERFACE
CIRCUIT
POWER
SOURCE
CPU
A/C-
CONTROL
PANEL
PASSENGER
COMPARTMENT
ZC6008750012
C-35
Connector: C-32, C-35
C-32
ZC6008780031
Connectors: C-301, C-306
C-306
C-301
AIR CONDITIONING
55A-87
MANUAL A/C DIAGNOSIS
ZC6008760041
Connector: C-119
ZC6008800010
Connector: D-12
ZC6008820010
Connectors: F-05, F-20
F-05 (B)
F-20 (B)
TECHNICAL DESCRIPTION (COMMENT)
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
⦆
Malfunction of the A/C-ECU
⦆
Malfunction of the rear window defogger relay
⦆
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.
Q:Do the A/C and outside/inside air selection damper
control motor work normally?
YES:
Go to Step 2.
NO:
Refer to Inspection procedure 2, "Malfunction of the
A/C-ECU power supply system P.55A-63."
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 P.00E-2. The rear window
defogger system should work normally.
55A-88
AIR CONDITIONING
MANUAL A/C DIAGNOSIS
STEP 3. Check the rear window defogger relay continuity.
2
3
4
1
ZC6030450000
ETACS-ECU
Follow the table below to check the rear window defogger relay
for continuity.
Battery voltage
Connect tester
between
Specified
condition
Not applied
3 - 4
Open Circuit
⦆
Connect terminal 1
to
the
positive
battery terminal
⦆
Connect terminal 2
to
the
negative
battery terminal
3 - 4
Less than 2 ohms
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-20 and A/
C control panrl connector C-119 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q:Are rear window defogger connector F-20 and A/C control
panrl connector C-119 in good condition?
YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to GROUP 00E,
Harness Connector Inspection P.00E-2. The rear window
defogger system should work normally.
AIR CONDITIONING
55A-89
MANUAL A/C DIAGNOSIS
STEP 5. Measure the voltage at rear window defogger
connector F-20.
(1)
Disconnect rear window defogger connector F-20, and
measure the voltage at the harness side.
(2)
Disconnect A/C-ECU connector C-119 and ground harness
side terminal No.6.
(3)
Turn the ignition switch to the "ON" position.
ZC6022230016
Harness side: F-20
(4)
Measure the voltage between rear window defogger
connector F-20 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.
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.
ZC6022230018
Harness side: C-306
(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-35 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If intermediate connector C-35 is damaged,
repair or replace the connector as described in GROUP 00E,
Harness Connector Inspection P.00E-2.
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.
55A-90
AIR CONDITIONING
MANUAL A/C DIAGNOSIS
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