Mitsubishi Montero (2002-2004). Manual - part 480

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-91

 STEP 3. Check the ground circuit to the side step light 
assembly (LH). Test at side step light assembly (LH) 
connector F-31.
(1) Disconnect side step light assembly (LH) connector F-31 

and measure the resistance available at the harness side of 
the connector.

(2) Measure the resistance value between terminal 1 and 

ground.

• The resistance should equal 2 ohms or less.

Q:  Is the measured resistance 2 ohms or less?

YES : Go to Step 4.
NO :  Go to Step 6.

 STEP 4. Check side step light-ECU connector D-137 and 
side step light assembly (LH) connector F-31 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q:  Is side step light-ECU connector D-137 and side step 

light assembly (LH) connector F-31 in good condition?
YES : Go to Step 5.
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.

AC204178

CONNECTOR : F-31

AG

HARNESS SIDE

F-31(B)

F-31(B)

1

2

1

2

AC204602

CONNECTOR F-31
(HARNESS SIDE)

AB

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-31

AG

HARNESS SIDE

F-31(B)

F-31(B)

1

2

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-92

 STEP 5. Check the wiring harness between side step light-
ECU connector D-137 (terminal 4) and side step light 
assembly (LH) connector F-31 (terminal 2).
NOTE: Also check intermediate connector D-125 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector D-125 is damaged, repair 
or replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

Q:  Is the wiring harness between side step light-ECU 

connector D-137 (terminal 4) and side step light 
assembly (LH) connector F-31 (terminal 2) in good 
condition?
YES : Replace the side step light-ECU. Verify that the side 

step light illuminate normally.

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 side step light illuminate normally.

 STEP 6. Check side step light assembly (LH) connector F-
31 for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q:  Is side step light assembly (LH) connector F-31 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 side step light illuminate 

normally.

AC204188

CONNECTORS : D-125, D-137

D-137(GR)

AM

HARNESS SIDE

D-137(GR)

D-125

D-125

9

8

6 7

5

3 4

20

32

21

33

43

17 18

30

41

16

29

28

39 40

13

25

12

24

35 36

14

26

37

15

27

38

19

31

42

1

10

22

2

11

23

34

1

2

8 7

4

5

10

11

12

6

9

3

AC204178

CONNECTOR : F-31

AG

HARNESS SIDE

F-31(B)

F-31(B)

1

2

AC204178

CONNECTOR : F-31

AG

HARNESS SIDE

F-31(B)

F-31(B)

1

2

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-93

 STEP 7. Check the wiring harness between side step light 
assembly (LH) connector F-31 (terminal 1) and ground.
Q:  Is the wiring harness between side step light assembly 

(LH) connector F-31 (terminal 1) and the ground in good 
condition?
YES : Replace the side step light-ECU. Verify that the side 

step light illuminate normally.

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 side step light illuminate normally.

STEP 8. Check the side step light operation.
(1) Disconnect side step light assembly (RH) connector F-30.
(2) When battery voltage is applied between the terminals, 

check that the side step light (RH) illuminate.

Q: Is side step light (RH) illuminate?

YES : Go to Step 9.
NO :  Replace the side step light harness. Verify that the 

side step light illuminate normally.

 STEP 9. Check the ground circuit to the side step light 
assembly (RH). Test at side step light assembly (RH) 
connector F-30.
(1) Disconnect side step light assembly (RH) connector F-31 

and measure the resistance available at the harness side of 
the connector.

(2) Measure the resistance value between terminal 1 and 

ground.

• The resistance should equal 2 ohms or less.

Q:  Is the measured resistance 2 ohms or less?

YES : Go to Step 10.
NO :  Go to Step 12.

AC204178

CONNECTOR : F-31

AG

HARNESS SIDE

F-31(B)

F-31(B)

1

2

1 2

AC204221

SIDE STEP 
ASSEMBLY

AB

AC204177

CONNECTOR : F-30

AH

HARNESS SIDE

F-30(B)

F-30(B)

1

2

1

2

AC204602

CONNECTOR F-30 
(HARNESS SIDE)

AC

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-94

 STEP 10. Check side step light-ECU connector D-137 and 
side step light assembly (RH) connector F-30 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q:  Is side step light-ECU connector D-137 and side step 

light assembly (RH) connector F-30 in good condition?
YES : Go to Step 11.
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

AC204177

CONNECTOR : F-30

AH

HARNESS SIDE

F-30(B)

F-30(B)

1

2