Mitsubishi Montero (2004+). Manual - part 794

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-433

STEP 4. Check the input signal (by using the pulse check 
mode of the monitor.)
Check the input signals from the following switches:

• Key reminder switch

• All door switch

Operate scan tool MB991958 according to the procedure below 
to display "PULSE CHECK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

Check if scan tool MB991958 sounds or not.

Q: When the key reminder switch, each door switch and 

the interior light are operated, does scan tool MB991958 
sound in each case?
Buzzer of scan tool MB991958 sounds normally : Go to 

Step 5.

Scan tool MB991958 does not sound when the key 
reminder switch is operated : Refer to Inspection 

Procedure P-1 "ETACS-ECU does not receive a 
signal from the key reminder switch 

P.54B-545

."

Scan tool MB991958 does not sound whenever each 
door switch is operated : Refer to Inspection Procedure 

P-4 "ETACS-ECU does not receive a signal from all 
the door switches 

P.54B-559

."

STEP 5. Determine a trouble spot.
Q: Which light does not illuminate?

All lights does not illuminate : Go to Step 6.
The dome light and rear personal lights does not 
illuminate : Go to Step 9.
The cargo space light and rear personal lights does not 
illuminate. : Go to Step 10.
Both rear personal light does not illuminate. : Go to Step 

11.

The dome light does not illuminate. : Go to Step 12.
The cargo space light does not illuminate : Go to Step 

19.

The rear personal light (LH) does not illuminate. : Go to 

Step 26.

The rear personal light (RH) does not illuminate. : Go to 

Step 34.

ITEM NAME

CONDITION

Key reminder switch

Remove and reinsert the 
ignition key

Each door switch

Open or close one of the doors

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-434

STEP 6. Check the wiring harness between dome light 
connector F-03 (terminal 1) and fusible link (1).

ACX02274

FUSIBLE LINK (1)

AE

BATTERY

AC204177

CONNECTOR : F-03

AC

HARNESS SIDE

1
2

F-03

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-435

NOTE: Also check intermediate connector D-26, D-28, junction 
block connector D-207 and D-221 for loose, corroded, or dam-
aged terminals, or terminals pushed back in the connector. If 
junction block connector D-207, D-221, intermediate connector 
D-26 or D-28 is damaged, repair or replace the damaged com-
ponent(s) as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. 

Q: Is the wiring harness between dome light connector 

F-03 (terminal 1) and fusible link (1) in good condition?
YES : Go to Step 7.
NO :  Repair the wiring harness. Verify that the dome light 

illuminates normally.

AC204188

CONNECTORS : D-26, D-28

D-28

AH

D-26

D-28

D-26

2 3

27

32

28

33

16

15

4 5

19

18

29

17

34

7 8

35

22

21

9 10

30

36

31

37

25

24

23

6

20

1

14

26

11

13

12

38

2 3

1

7

6

12

11

8

13

5

4

9 10

AC204191

CONNECTORS : D-207, D-221

D-207

AB

HARNESS SIDE

HARNESS SIDE

D-221

D-207

D-221

3

1

4

6 5

7

8

2

1

2

3

4

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-436

STEP 7. Check ETACS-ECU connector D-222 for damage.
Q: ETACS-ECU connector D-222 in good condition?

YES : Go to Step 8.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Verify 

that the dome light illuminates normally.

STEP 8. Check the wiring harness between dome light 
connector F-03 (terminal 2) and ETACS-ECU connector 
D-222 (terminal 18).

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

AC204177

CONNECTOR : F-03

AC

HARNESS SIDE

1
2

F-03