Mitsubishi Montero (2002-2004). Manual — part 353

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

54Bb-459

NOTE: Also check intermediate connectors D-26, D-28, junc-
tion block connectors D-207 and D-221 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If intermediate connector D-26, D-28, junction block connector
D-207 or D-221 is damaged, repair or replace the damaged
component(s) as described in GROUP, 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 : No action to be taken.
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

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SWS SYMPTOM PROCEDURES

54Bb-460

INSPECTION PROCEDURE M-2: Interior Light: Dome light dimming function does not work normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991502 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54Ba-8

."

.

CIRCUIT OPERATION
The ETACS-ECU operates the dome light dimming
function according to the following switches:

• Ignition switch (IG1)

• Key reminder switch

• Front door switches

• Driver's door lock actuator switch

.

TECHNICAL DESCRIPTION (COMMENT)
Is the dome lights do not dim normally, the input cir-
cuits from the switches described in "CIRCUIT
OPERATION" or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The key reminder switch may be defective

• The door switches may be defective

• The driver’s door lock actuator switch may be

defective

• The ETACS-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 Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

• MB991862: SWS monitor kit

STEP 1. Verify the dome light.
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 Inspection Procedure M-1 "The dome light do

not illuminate or go out normally

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Interior Light Dimming Function

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

54Bb-461

STEP 2. Use scan tool MB991502 to select "ECU COMM
CHK" on the SWS monitor display.
Check the ETACS-ECU.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector

(16-pin).

(2) Connect SWS monitor kit MB991862 to the data link

connector (13-pin).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991502 according to the procedure

below to display "ECU COMM CHK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

(5) Scan tool MB991502 should show "OK" on the "ECU

COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES : Go to Step 3.
NO : Refer to Inspection Procedure A-3 "Communication

with ETACS-ECU is not possible

P.54Bb-25

."

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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STEP 3. Check the input signal by using "DATA LIST"
menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON or START

• Driver’s door: open

Operate scan tool MB991502 according to the procedure below
to display "ETACS ECU."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."

Check that normal conditions are displayed on the items
described in the table below.

Q: Are normal conditions displayed on the "IG SW (IG1)"

and "FRONT DOOR SW"?
YES : Go to Step 4.
NO :

• Normal condition is not displayed on the "IG SW

(IG1)": Refer to Inspection Procedure O-2
"ETACS-ECU does not receive any signal from
the ignition switch (IG1)

P.54Bc-7

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• Normal condition is not displayed on the "FRONT

DOOR SW": Refer to Inspection Procedure O-5
"ETACS-ECU does not receive any signal from
the driver's or the front passenger's door switch

P.54Bc-23

."

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 30

IG SW (IG1)

ON

ITEM 32

FRONT DOOR SW

ON

AC204222AB

16-pin

13-pin

MB991502

MB991862