Mitsubishi Montero (2004+). Manual - part 719

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-133

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 

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

Central Door Lock (Door Lock Switch) Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-134

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 MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991502 to the data link connector 

(16-pin).

(2) Operate scan tool MB991958 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 MB991958 sounds or not.
Q: Does scan tool MB991958 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.54B-529

."

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-135

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

Central Door Lock (Door Lock Key Cylinder Switch) Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-136

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 MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991502 to the data link connector 

(16-pin).

(2) Operate scan tool MB991958 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 MB991958 sounds.
Q: Does scan tool MB991958 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.54B-520

."

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827