Mitsubishi Montero (2002-2004). Manual - part 248

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-39

STEP 10. Replace the ECU.
(1) Replace the front-ECU.
(2) The system should communicate with the front-ECU 

normally.

Q: Can the system communicate with the front-ECU?

YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. The system should 

communicate with the front-ECU normally.

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-40

INSPECTION PROCEDURE A-5: Communication with the sunroof motor assembly (sunroof-ECU) is 
not possible.

Sunroof Motor Assembly (Sunroof-ECU) and SWS Communication Circuit

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-41

.

CIRCUIT OPERATION

• Power to the sunroof motor assembly is supplied 

through fusible links (1) and (4).

• When the ignition switch (IG2) signal is on, the 

sunroof motor assembly is ready to operate.

.

TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit or the communication circuit 
to the sunroof motor assembly or the sunroof motor 
assembly may be defective.

.

TROUBLESHOOTING HINTS

• The sunroof motor assembly 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 (1), (4)

AE

BATTERY

FUSIBLE LINK (4)

FUSIBLE LINK (1)

AC204170

CONNECTORS : D-01, D-02, D-26, D-28

D-01

BF

D-28

D-02

D-26

AC204173

CONNECTORS : D-207, D-208, D-210, D-211

D-207

D-208

D-210

D-211(B)

AP

AC204174

CONNECTOR : D-224

D-224(B)

AG

AC204177

CONNECTORS : F-02, F-24

AJ

F-02

F-24

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-42

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II) 

STEP 1. Check the fusible link (1) line of power supply 
circuit to the sunroof motor assembly. Test at sunroof 
motor assembly connector F-02.
(1) Disconnect sunroof motor assembly connector F-02 and 

measure the voltage available at the wiring harness side of 
the connector.

(2) Measure the voltage between terminal 3 and ground.

• The voltage should be approximately 12 volts (battery 

positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 4.
NO :  Go to Step 2.

STEP 2. Check sunroof motor assembly connector F-02 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is sunroof motor assembly connector F-02 in good 

condition?
YES : Go to Step 3.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. The system should communicate with the 

sunroof motor assembly (sunroof-ECU) normally.

AC204177

CONNECTOR : F-02

AB

HARNESS SIDE

1

5

2

7

8

6

3

4

10 9

F-02

AC204458

5

1

7

8

6

2

9

10

4

3

AB

CONNECTOR: F-02
(HARNESS SIDE)

AC204177

CONNECTOR : F-02

AB

HARNESS SIDE

1

5

2

7

8

6

3

4

10 9

F-02