Mitsubishi Montero (2004+). Manual - part 712

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-105

INSPECTION PROCEDURE C-2: Central Door Locking System: Some doors do not lock or unlock.

Central Door Lock Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-106

AC000759

CONNECTORS: D-15, D-111

AB

D-15

D-111

AC000758

CONNECTORS: D-25, D-125

AI

D-25

D-125

ACX02285

CONNECTORS: D-209, D-217

AL

D-209

D-217

JUNCTION BLOCK (FRONT VIEW)

ACX02286

CONNECTOR: D-222

AC

JUNCTION BLOCK (REAR VIEW)

ACX02289

CONNECTORS: F-12, F-23

F-23

AE

F-12

AC204524

CONNECTOR: G-10

AB

G-10

AC000235 AD

H-10

CONNECTOR: H-10

FRONT DOOR <DRIVER'S SIDE>

AC000237AI

H-13

CONNECTOR: H-13

REAR DOOR <LH>

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-107

.

CIRCUIT OPERATION

• The ETACS-ECU controls the central door lock 

system, locking or unlocking all the doors by acti-
vating the central door lock relay (built into the 
ECU). The ETACS-ECU uses inputs from the fol-
lowing components:

• Driver's or passenger's door lock actuator 

switch

• Driver's or passenger's door lock key cylinder 

switch

• Door lock switch, which is incorporated in the 

power window main switch or power window 
sub switch (front RH)

.

TECHNICAL DESCRIPTION (COMMENT)
If only some doors do not lock or unlock, the harness 
wiring between the door lock actuator or the 
ETACS-ECU and the door lock actuator may be 
defective.

.

TROUBLESHOOTING HINTS

• The driver’s or front passenger’s door lock actua-

tor may be defective

• The ETACS-ECU may be defective

• The harness wiring or connectors may have 

loose, corroded or damaged terminals, or termi-
nals pushed back in the connector 

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check which door lock is defective.
Q: Which of the door locks is defective?

Driver's door : Go to Step 2.
Front passenger's door : Go to Step 7.
Rear passenger's door (LH) : Go to Step 12.
Rear passenger's door (RH) : Go to Step 17.
Back door : Go to Step 22.

AC000238AJ

H-24

CONNECTOR: H-24

FRONT DOOR <RH>

AC000316 AH

H-21

CONNECTOR: H-21

REAR DOOR <RH>

ACX02293

CONNECTOR: I-05

AB

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-108

STEP 2. Check driver's door lock actuator connector H-10 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is driver's door lock actuator connector H-10 in good 

condition?
YES : Go to Step 3.
NO :  Repair or check the connector. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

. After repairs 

have been made, verify that all the doors can now be 
locked and unlocked normally.

STEP 3. Check the driver's door lock actuator.

1. Remove the driver's door lock actuator, and check it. Refer 

to GROUP 42 

− Door Handle and Latch 

P.42-41

.

2. Follow the table below to check the driver's door lock actua-

tor for correct operation.

Q: Does the driver's door lock actuator work normally?

YES : Go to Step 4.
NO :  Replace the driver's door lock actuator. Verify that all 

the doors can be locked and unlocked function should 
now work normally. 

AC000235 AE

H-10 (B)

CONNECTOR: H-10

FRONT DOOR <DRIVER'S SIDE>

H-10 (B)

1

2

3

4

5

6

(HARNESS SIDE)

LEVER 
POSITION

BATTERY 
CONNECTION

LEVER 
OPERATION

At the 
"LOCK" 
position

• Connect terminal 4 

to the positive 
battery terminal

• Connect terminal 6 

to the negative 
battery terminal

The lever moves 
from the "LOCK" 
position to the 
"UNLOCK" position.

At the 
"UNLOCK" 
position

• Connect terminal 6 

to the positive 
battery terminal

• Connect terminal 4 

to the negative 
battery terminal

The lever moves 
from the "UNLOCK" 
position to the 
"LOCK" position.

ACX00543

LOCK

UNLOCK

VIEW A

A

AE

LEVER