Mitsubishi Montero (2002-2004). Manual - part 483

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-103

INSPECTION PROCEDURE 4: The Side Step Light do not Illuminate Normally when Either Door is 
Opened or Closed.

Side Step Light-ECU Circuit

AC204171

CONNECTOR : D-111

AG

AC204170

CONNECTOR : D-137

AX

D-137(GR)

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-104

.

TECHNICAL DESCRIPTION (COMMENT) 
If side step light do not illuminate normally, the input 
circuit from the door switch or the side step light-ECU 
may be defective.

.

TROUBLESHOOTING HINTS

• The front, rear or back door switch may be defec-

tive

• The side step light-ECU 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: Harness Set

STEP 1. Verify the door switch.
If the dome light switch are moved to the "door interlock posi-
tion", the dome light should illuminate when either door is 
opened.
Q: Do the dome light illuminate normally?

YES : Go to Step 2.
NO :  Refer to GROUP 54B, Inspection Procedure M-1 "The 

dome light do not illuminate or go out normally 

P.54Bb-450

."

AC204173

CONNECTORS : D-209, 217

AK

D-209

D-217

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-105

 STEP 2. Check side step light-ECU connector D-137 and 
rear door switch (RH) connector F-05 for loose, corroded 
or damaged terminals, or terminals pushed back in the 
connector.
Q:  Is side step light-ECU connector D-137 and rear door 

switch (RH) connector F-05 in good condition?
 YES : Go to Step 3.
 NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the side step light illuminate 

normally.

AC204170

CONNECTOR : D-137

HARNESS SIDE

D-137(GR)

D-137(GR)

AR

1

2

8 7

4

5

10

11

12

6

9

3

AC204178

CONNECTOR : F-05

AB

HARNESS SIDE

1

2

3

F-05

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-106

 STEP 3. Check the wiring harness between side step light-
ECU connector D-137 (terminal 9) and rear door switch 
(RH) connector F-05 (terminal 2).

AC204170

CONNECTOR : D-137

HARNESS SIDE

D-137(GR)

D-137(GR)

AR

1

2

8 7

4

5

10

11

12

6

9

3

AC204178

CONNECTOR : F-05

AB

HARNESS SIDE

1

2

3

F-05