Mitsubishi Montero (2004+). Manual - part 773

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-349

STEP 10. Check the wiring harness between headlight (LH) 
connector A-20 (terminal 1) and front-ECU connector 
A-07X (terminal 6).

NOTE: Also check joint connector A-17 for loose, corroded, or 
damaged terminals, or terminals pushed back in the connector. 
If joint connector A-17 is damaged, repair or replace the dam-
aged component(s) as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between headlight (LH) connector 

A-20 (terminal 1) and front-ECU connector A-07X 
(terminal 6) in good condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the headlights illuminate normally.

AC204183

CONNECTOR : A-07X

AB

2 1

3

4

6

7

8

9

5

11 10

RELAY BOX SIDE

AC204185

CONNECTORS : A-17, A-20

A-20(B)

A-17(GR)

AE

A-17

HARNESS SIDE

A-20(B)

2

1

Y

3

14

13

4

1112

5

3

10

8 9

2

7

1

6

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-350

STEP 11. Check headlight (RH) bulb.
(1) Remove the headlight (RH) bulb.
(2) Verify that the headlight (RH) bulb is not damaged or 

burned out.

Q: Is headlight (RH) bulb normal?

YES : Go to Step 12.
NO :  Replace the headlight (RH) bulb. Verify that the 

headlights illuminate normally.

STEP 12. Check headlight (RH) connector A-32 and 
front-ECU connector A-07X for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are headlight (RH) connector A-32 and front-ECU 

connector A-07X in good condition?
YES : Go to Step 13.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the headlights illuminate normally.

AC204183

CONNECTOR : A-07X

AB

2 1

3

4

6

7

8

9

5

11 10

RELAY BOX SIDE

AC204166

CONNECTOR : A-32

HARNESS 
SIDE

A-32(B)

A-32(B)

AE

2

1

Y

3

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-351

STEP 13. Check the wiring harness between headlight (RH) 
connector A-32 (terminal 1) and front-ECU connector 
A-07X (terminal 6).
Q: Is the wiring harness between headlight (RH) connector 

A-32 (terminal 1) and front-ECU connector A-07X 
(terminal 6) in good condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the headlights illuminate normally.

STEP 14. Check headlight (LH) bulb.
(1) Remove the headlight (LH) bulb.
(2) Verify that the headlight (LH) bulb is not damaged or burned 

out.

Q: Is headlight (LH) bulb normal?

YES : Go to Step 15.
NO :  Replace the headlight (LH) bulb. Verify that the 

headlights illuminate normally.

AC204183

CONNECTOR : A-07X

AB

2 1

3

4

6

7

8

9

5

11 10

RELAY BOX SIDE

AC204166

CONNECTOR : A-32

HARNESS 
SIDE

A-32(B)

A-32(B)

AE

2

1

Y

3

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-352

STEP 15. Check headlight (LH) connector A-20 and 
front-ECU connector A-07X for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are headlight (LH) connector A-20 and front-ECU 

connector A-07X in good condition?
YES : Go to Step 16.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the headlights illuminate normally.

AC204183

CONNECTOR : A-07X

AB

2 1

3

4

6

7

8

9

5

11 10

RELAY BOX SIDE

AC204167

CONNECTOR : A-20

HARNESS 
SIDE

A-20(B)

A-20(B)

AI

2

1

Y

3