Mitsubishi L200. Manual - part 885

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-69

STEP 9. Check the wiring harness between C-217 
rear window defogger relay connector No.2 and 
D-11 rear panel power window-ECU connector 
No.15.

AC509611AR

Connector: C-43 <LHD>

Harness side

AC509932AS

Harness side

Connector: C-43 <RHD>

AC509934 BB

Connectors: C-208, C-217 <LHD>

Harness side

C-208

C-217

C-217

C-208

Junction block side

Junction block (Front view)

AC509936AY

Connectors: C-208, C-217 <RHD>

Harness side

C-208

C-217

C-217

C-208

Junction block side

Junction block (Front view)

NOTE: 

AC509613AR

Connector: C-15 <LHD>

AC509932BH

Connector: C-15 <RHD>

Prior to the wiring harness inspection, check junction 
block connector C-208 and intermediate connector 
C-15, and repair if necessary.

• Check the rear window defogger power supply 

line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-70

STEP 10. Check the wiring harness between C-
217 rear window defogger relay connector No.3 
and D-08 rear window defogger connector No.1.

AC509934BC

Connectors: C-212, C-217 <LHD>

Harness side

C-212

C-217

C-212

C-217

Junction block side

Junction block (Front view)

AC509936AZ

Connectors: C-212, C-217 <RHD>

Harness side

C-212

C-217

C-212

C-217

Junction block side

Junction block (Front view)

AC509967AP

Harness side

Connector: D-08 <Double cab>

NOTE: Prior to the wiring harness inspection, check 
junction block connector C-212, and repair if neces-
sary.

• Check the rear window defogger relay line for 

open or 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.

STEP 11. Resistance 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.

AC403234

Connector D-08 
(Harness side)

EI

(2) Continuity between terminal 2 and body earth.

OK: Continuity (Less than 2

Ω)

Q: Is the check result normal?

YES : 

 Go to Step 13.

NO : 

 Go to Step 12.

STEP 12. Check the wiring harness between D-08 
rear window defogger connector terminal No.2 
and earth.

AC509967AP

Harness side

Connector: D-08 <Double cab>

• Check the rear window defogger earth 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 or replace the wiring harness.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-71

STEP 13. Connector check: C-43 A/C-ECU 
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 14.

NO : 

Repair the connector.

STEP 14. Check the wiring harness between C-43 
A/C-ECU connector terminal No.14 and D-11 rear 
panel power window-ECU connector terminal 
No.3.

AC509967AP

Harness side

Connector: D-08 <Double cab>

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-15, and repair if necessary.

• Check the rear window defogger earth line for 

open circuit.

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair or replace the wiring harness.

STEP 15. Check the rear window defogger.
Refer to GROUP 54A, Rear Window rear window 
defogger Inspection .

Q: Does the rear window defogger work normally? 

YES : 

The trouble can be an intermittent 

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

NO : 

Repair the rear window defogger.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-72

Inspection Procedure 8: The PTC heater does not work <Russia>

PTC Heater Circuit

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

FUSIBLE
LINK

IGNITION
SWITCH (IG2)

PTC
HEATER
RELAY 2

PTC
HEATER
RELAY 1

PTC
HEATER 1

PTC
HEATER 2

ENGINE-
ECU

A/C-
ECU

3

1

4

2

3

1

4

2

ACA00487

25

COMMENTS ON TROUBLE SYMPTOM
When the PTC heater does not work under the fol-
lowing conditions, the heater switch system or the 
PTC heater circuit system may be defective.

PTC heater operating conditions

• heater switch: ON

• Air outlet: FOOT/DEF, FOOT, FACE/FOOT

• Temperature control dial: MAX HOT

• Coolant temperature: 80 degrees celsius or less