Mitsubishi L200. Manual — part 884

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-65

Inspection Procedure 7: The rear window defogger does not work <Vehicles with rear panel power
window >

Rear Window Defogger Circuit

REAR WINDOW
DEFOGGER RELAY

REAR WINDOW
DEFOGGER SWITCH

REAR WINDOW
DEFOGGER

FUSIBLE
LINK

IGNITION
SWITCH (IG2)

20

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple

AC900631

REAR
PANEL
POWER
WINDOW-ECU

A/C-ECU

COMMENTS ON TROUBLE SYMPTOM
If the rear window defogger does not operate when
the rear window defogger switch is turned on, the
rear window defogger relay system may be defec-
tive.

PROBABLE CAUSES

• Malfunction of the automatic A/C control panel (A/

C-ECU)

• Malfunction of the rear panel power window-ECU

• Malfunction of the rear window defogger relay

• Damaged the wiring harness or connectors

• Malfunction of the rear window defogger

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-66

DIAGNOSIS PROCEDURE

STEP 1. Check the A/C operation.

Q: Do the A/C work normally?

YES :

Go to Step 2.

NO :

Refer to Inspection procedure 1 "Cool air
does not come

P.55B-23

."

STEP 2. Connector check: D-11 rear panel power
window-ECU connector and D-08 rear window
defogger connector

AC509611AR

Connector: C-43 <LHD>

Harness side

AC509932AS

Harness side

Connector: C-43 <RHD>

AC509967AP

Harness side

Connector: D-08 <Double cab>

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector.

STEP 3. Voltage measurement at D-08 rear
window defogger connector.

AC509967AP

Harness side

Connector: D-08 <Double cab>

(1) Disconnect the connector, and measure at the

wiring harness side.

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

AC509611AR

Connector: C-43 <LHD>

Harness side

AC509932AS

Harness side

Connector: C-43 <RHD>

(3) Disconnect rear panel power window-ECU

connector D-11 and earth terminal 15.

AC402679

Connector D-08
(Harness side)

GV

(4) Measure the voltage between terminal 1 and

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-67

body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Go to Step 4.

STEP 4. Check the rear window defogger relay
continuity.
Refer to .

Q: Is the rear window defogger relay in good

condition?
YES :

Go to Step 5.

NO :

Replace the rear window defogger relay.

STEP 5. Voltage measurement at C-217 rear
window defogger relay connector.

AC509934AY

Connector: C-217 <LHD>

Junction block side

Junction block (Front view)

AC509936AV

Connector: C-217 <RHD>

Junction block side

Junction block (Front view)

(1) Remove the relay, and measure at the junction

block side.

AC402679

Connector C-217
(Harness side)

CC

(2) Measure the voltage between terminal 4 and

body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

STEP 6. Check the wiring harness between C-217
rear window defogger relay connector terminal
No.4 and the fusible link (20).

AC509934AZ

Connectors: C-213, C-217 <LHD>

Harness side

C-213

C-217

Junction block side

C-217

Junction block (Front view)

C-213

AC509936AW

Connectors: C-213, C-217 <RHD>

Harness side

C-213

C-217

Junction block side

C-217

Junction block (Front view)

C-213

NOTE: Prior to the wiring harness inspection, check
junction block connector C-213, and repair if neces-
sary.

• Check the rear window defogger relay power

supply line for open and short circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Repair the wiring harness.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-68

STEP 7. Voltage measurement at C-217 rear
window defogger relay connector.

AC509934AY

Connector: C-217 <LHD>

Junction block side

Junction block (Front view)

AC509936AV

Connector: C-217 <RHD>

Junction block side

Junction block (Front view)

(1) Remove the relay, and measure at the junction

block side.

(2) Turn the ignition switch to the "ON" earth position.

AC402679

Connector C-217
(Harness side)

CD

(3) Voltage between terminal 1 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 8.

STEP 8. Check the wiring harness between C-217
rear window defogger relay connector No.1 and
ignition switch (IG2).

AC509934 BA

Connectors: C-207, C-217 <LHD>

Harness side

C-207

C-217

C-207

C-217

Junction block side

Junction block (Front view)

AC509936AX

Connectors: C-207, C-217 <RHD>

Harness side

C-207

C-217

C-207

C-217

Junction block side

Junction block (Front view)

NOTE: Prior to the wiring harness inspection, check
junction block connector C-207, and repair if neces-
sary.

• Check the rear window defogger power supply

line for open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Repair the wiring harness.