Mitsubishi Montero (2002-2004). Manual - part 269

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-123

INSPECTION PROCEDURE C-3: Central Door Locking System: All the doors do not lock or unlock 
with the door lock switch operation.

.

TECHNICAL DESCRIPTION (COMMENT)
The door lock switch (built into the power window 
switch) or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The power window switch (door lock 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 

Central Door Lock (Door Lock Switch) Circuit

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-124

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II) 

Check the input signal (by using the pulse check mode of 
the monitor.)
Check the input signals from the door lock switch:

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) Operate scan tool MB991502 as follows:

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

(3) Move the driver's or the front passenger's door lock switch 

from "LOCK" to "UNLOCK" or vice versa.

(4) Check scan tool MB991502 sounds or not.
Q: Does scan tool MB991502 sound when operating the 

door lock switches as described?
YES : Replace the ETACS-ECU. Verify that all the doors 

can now be locked and unlocked by the door lock 
switch.

NO :  Refer to Inspection Procedure O-7 "ETACS-ECU 

does not receive a signal from the door lock switch 
(incorporated in the power window main switch) 

P.54Bc-119

."

ACX01539

16-pin

MB991502

AI

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-125

INSPECTION PROCEDURE C-4: Central Door Locking System: All the doors do not lock or unlock 
with just the door lock key cylinder key operation.

.

TECHNICAL DESCRIPTION (COMMENT)
The door lock switch (built into the power window 
switch) or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The door lock key cylinder switch may be defec-

tive

• 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

Central Door Lock (Door Lock Key Cylinder Switch) Circuit

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-126

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

Check the input signal (by using the pulse check mode of 
the monitor.)
Check the input signals from the door lock key cylinder switch.

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) Operate scan tool MB991502 as follows:

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

(3) Use the driver's or passenger's door lock key cylinder to 

lock and unlock the doors. 

(4) Check that scan tool MB991502 sounds.
Q: Does scan tool MB991502 sound when operating the 

door locks as described?
YES : Replace the ETACS-ECU. Verify that all the doors 

can now be locked and unlocked by using each door 
lock key cylinder switch.

NO :  Refer to Inspection Procedure O-5 "ETACS-ECU 

does not receive a signal from the driver's door, front 
passenger's door lock key cylinder switch 

P.54Bc-75

."

ACX01539

16-pin

MB991502

AI