Mitsubishi Montero (2004+). Manual - part 772

 

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Mitsubishi Montero (2004+). Manual - part 772

 

 

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-345

Inspection Procedure J-7: Headlight and Taillight: One of the headlights does not illuminate.

Headlights Circuit

AC204183

CONNECTOR : A-07X

AG

AC204167

CONNECTORS : A-15, A-17, A-20

A-15

AP

A-17(GR)

A-20(B)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-346

.

TECHNICAL DESCRIPTION (COMMENT) 
If one of the headlights does not illuminate, a head-
light bulb may be defective.

.

TROUBLESHOOTING HINTS

• The headlight bulb may be defective

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

.

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set 

STEP1. Check the headlight operation.
Q: Which of the headlights does not illuminate?

LH (low and high beam) : Go to Step 2.
RH (low and high beam) : Go to Step 5.
LH (only low beam) : Go to Step 8.
RH (only low beam) : Go to Step 11.
LH (only high beam) : Go to Step 14.
RH (only high beam) : Go to Step 17.
Low beam only (both RH and LH) : Refer to Inspection 

Procedure J-2 "headlights (low-beam) do not 
illuminat

P.54B-304

."

High beam only (both RH and LH) : Refer to Inspection 

Procedure J-3 "headlights (high-beam) do not 
illuminat

P.54B-308

."

STEP 2. 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 3.
NO :  Replace the headlight (LH) bulb. Verify that the 

headlights illuminate normally.

AC204166

CONNECTOR : A-32

AM

A-32(B)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-347

STEP 3. Check headlight (LH) connector A-20 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is headlight (LH) connector A-20 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the headlights illuminate normally.

STEP 4. Check the wiring harness between headlight (LH) 
connector A-20 (terminal 2) and ground.
Q: Is the wiring harness between headlight (LH) connector 

A-20 (terminal 2) and ground 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 5. 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 6.
NO :  Replace the headlight (RH) bulb. Verify that the 

headlights illuminate normally.

STEP 6. Check headlight (RH) connector A-32 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is headlight (RH) connector A-32 in good condition?

YES : Go to Step 7.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the headlights illuminate normally.

AC204167

CONNECTOR : A-20

HARNESS 
SIDE

A-20(B)

A-20(B)

AI

2

1

Y

3

AC204167

CONNECTOR : A-20

HARNESS 
SIDE

A-20(B)

A-20(B)

AI

2

1

Y

3

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-348

STEP 7. Check the wiring harness between headlight (RH) 
connector A-32 (terminal 2) and ground.
Q: Is the wiring harness between headlight (RH) connector 

A-32 (terminal 2) and ground 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 8. 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 9.
NO :  Replace the headlight (LH) bulb. Verify that the 

headlights illuminate normally.

STEP 9. 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 10.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the headlights illuminate normally.

AC204166

CONNECTOR : A-32

HARNESS 
SIDE

A-32(B)

A-32(B)

AE

2

1

Y

3

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

 

 

 

 

 

 

 

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