Mitsubishi Montero (2004+). Manual - part 741

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-221

STEP 11. Check the harness wire between sunroof switch 
connector F-01 (terminal 4) and ground.

NOTE: Also check intermediate connectors F-24 and D-26 for 
loose, corroded or damaged terminals, or terminals pushed 
back in the connectors. If intermediate connectors F-24 and 
D-26 are damaged, repair or replace the damaged compo-
nent(s) as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Is the harness wire between sunroof switch connector 

F-01 (terminal 4) and ground in good condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. The sunroof 
function should now work normally.

AC203849AB

F-01
(HARNESS SIDE)

CONNECTOR: F-01

F-01 (B)

1

2

3

4

5

6

AC204170

CONNECTOR : D-26

AG

2 3

1

7

6

12

11

8

13

5

4

9 10

AC204484

AF

CONNECTOR: F-24

F-24

F-24

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-222

INSPECTION PROCEDURE F-2: Sunroof: Any of the sunroof switch positions is defective.

.

TECHNICAL DESCRIPTION (COMMENT)
The sunroof switch or the sunroof motor assembly 
may be defective.

.

TROUBLESHOOTING HINTS

• The sunroof switch may be defective

• 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

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

Sunroof Switch Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-223

Check the input signal (by using the pulse check mode of 
the monitor.)
Check the input signals from the sunroof 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 according to the procedure 

below to display "PULSE CHECK."

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

(3) When each function of the sunroof switch is operated 

(turned on), check that scan tool MB991958 sounds.

Q: Does scan tool MB991958 sound when the sunroof 

switch is operated?
YES : Replace the sunroof motor assembly. The sunroof 

function should now work normally.

NO :  Refer to Inspection Procedure O-9 "ETACS-ECU 

does not receive a signal from "UP, ""OPEN" or 
"CLOSE/DOWN" switch 

P.54B-537

."

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-224

INSPECTION PROCEDURE F-3: Sunroof: Sunroof timer function does not work normally.

NOTE: This troubleshooting procedure requires the 
use of scan tool MB991958 and SWS monitor kit 
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor 

P.54B-10

."

.

CIRCUIT OPERATION

• The sunroof timer function works according to the 

signals from the following switches:

• Ignition switch (IG1): OFF

• Driver’s and passenger’s door switch: OFF

• Vehicle condition

• Ignition switch: LOCK position

• Driver’s and passenger’s door: Closed

• When a front door is opened and closed while the 

sunroof timer function is on, the sunroof operative 
duration will be changed.

.

TECHNICAL DESCRIPTION (COMMENT)
If the sunroof timer function does not work normally, 
the input circuits from the switches described in 
"CIRCUIT OPERATION", the sunroof motor assem-
bly, the ETACS-ECU or the SWS communication line 
may be defective. 

.

TROUBLESHOOTING HINTS

• The driver's or passenger's door switch may be 

defective

• 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

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

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

Sunroof Timer Function