Mitsubishi Montero (2004+). Manual - part 802

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-465

 STEP 1. Use scan tool MB991958 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the ETACS-ECU.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect the special tool. Refer to "How to connect SWS 

monitor 

P.54B-7

.

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 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."

(4) Scan tool MB991958 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 2.
NO :  Refer to Inspection Procedure A-3 "Communication 

with ETACS-ECU is not possible 

P.54B-42

."

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-466

 STEP 2. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: OFF

• Driver's door: open

• Front passenger's door: closed

Operate scan tool MB991958 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 3.
Normal condition is not displayed "IG SW (IG1)" : Refer 

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

P.54B-505

."

Normal condition is not displayed "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.54B-520

."

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 30

IG SW(IG1)

OFF

ITEM 32

FRONT DOOR SW

ON

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-467

STEP 3. Check the input signal (by using the pulse check 
mode of the monitor.)
Check the input signals from the key reminder 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 whether scan tool MB991958 sounds or not when 

the ignition key is removed and reinserted.

Q:  Does scan tool MB991958 sound when the ignition key 

is removed and reinserted?
YES : Go to Step 4.
NO :  Refer to Inspection Procedure P-1 "ETACS-ECU does 

not receive any signal from the key reminder switch 

P.54B-545

."

STEP 4. Check ETACS-ECU connector D-224 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector D-224 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 ignition key hole illumination 

light illuminates normally.

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

AC204174

CONNECTOR : D-224

AD

D-224(B)

D-224(B)

HARNESS SIDE

21

23

24

22

32

3433

31

26

27

28

3029

38

39

40

36

37

25

35

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-468

STEP 5. Check at ETACS-ECU connector D-224 in order to 
check the line from the ignition key hole illumination light.
(1) Disconnect ETACS-ECU connector D-224, and measure at 

the wiring harness side. 

(2) Connect terminal 36 to ground.
Q: Does the ignition key hole illumination light illuminate?

YES : Replace the ETACS-ECU. Verify that the ignition key 

hole illumination light illuminates normally.

NO :  Go to Step 6.

STEP 6. Check the ignition key hole illumination light bulb.
Q: Is the ignition key hole illumination light bulb in good 

condition?
YES : Go to Step 7.
NO :  Replace the bulb. Verify that the ignition key hole 

illumination light illuminates normally.

STEP 7. Check key reminder switch connector D-202 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is key reminder switch connector D-202 in good 

condition?
YES : Go to Step 8.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the ignition key hole illumination 

light illuminates normally.

AC204174

CONNECTOR : D-224

AD

D-224(B)

D-224(B)

HARNESS SIDE

21

23

24

22

32

3433

31

26

27

28

3029

38

39

40

36

37

25

35

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

ACX01584AB

CONNECTOR D-224
(HARNESS SIDE)

AC204172

CONNECTOR: D-202

AK

HARNESS SIDE

4

5

3

1

6

7

2