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

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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
illuminate

P.54B-304

."

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

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

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

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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