Mitsubishi Outlander GS45X. Manual — part 1016

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-91

INSPECTION PROCEDURE 9: Rear window defogger does not operate.

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
SUPPLY

CPU

A/C
CONTROL
PANEL

PASSENGER
COMPARTMENT

AC901239

AC702145AK

C-35

Connector: C-32, C-35

C-32

AC701632AP

Connectors: C-301, C-306

C-306

C-301

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-92

.

TECHNICAL DESCRIPTION (COMMENT)

If the defogger does not operate when the rear win-
dow 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-65

."

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.

AC702208AN

Connector: C-119

AC701630AJ

Connector: D-12

AC702211AF

Connectors: F-05, F-20

F-05 (B)

F-20 (B)

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-93

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-20 and
A/C control panel 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 panel 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.

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-control panel connector C-119 and ground

harness side terminal No.6.

(3) Turn the ignition switch to the "ON" position.
(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.

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

2

3

4

1

def

ay

AC702749

AB

Rear window
defogger relay

ETACS-ECU

AC608254BY

Harness side: F-20

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-94

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-35 for loose, cor-
roded, 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

.

• Check the rear window defogger relay power supply line for

open circuit.

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.

AC608254BZ

Harness side: C-306

AC608254 CA

Harness side: C-306