Mitsubishi Montero (2002-2004). Manual - part 258

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-79

INSPECTION PROCEDURE C-1: Central Door Locking System: The central door lock system does not 
work at all.

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

."

Central Door Lock Power Supply Circuit

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-80

.

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 
ETACS-ECU). The ETACS-ECU uses inputs from 
the following 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)

.

TROUBLESHOOTING HINTS

• 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

ACX02274

FUSIBLE LINK (2)

AF

BATTERY

FUSIBLE LINK

AC000758

CONNECTORS: D-25, D-28

AK

D-25

D-28

ACX02286

CONNECTOR: D-222

AC

JUNCTION BLOCK (REAR VIEW)

AC203774

CONNECTOR: H-10

AB

DRIVER'S DOOR

H-10

ACX02285

CONNECTORS: D-209, D-211, D-217

AK

D-211

D-209

D-217

JUNCTION BLOCK (FRONT VIEW)

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-81

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II) 

• MB991862: SWS Monitor Kit

STEP 1. Use scan tool MB991502 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the following 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. Also con-
nect SWS monitor kit MB991862 after turning on 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 2.
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

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-82

STEP 2. Check the battery power supply circuit to the 
ETACS-ECU. Test at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222, and measure at 

the junction block side.

(2) Measure the voltage between terminal 12 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 5.
NO :  Go to Step 3.

STEP 3. Check the ETACS-ECU connector D-222 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is the ETACS-ECU connector D-222 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the central door locking system 

should now works normally.

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

ACX01570

19

20

1817 1615 141312 1110 9 8 7

6 5 4 3 2 1

AB

CONNECTOR D-222
(JUNCTION BLOCK SIDE)

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222