Mitsubishi Galant (2004+). Manual - part 226

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-95

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CIRCUIT OPERATION

• Power to the sunroof motor assembly is supplied 

through fusible link (5).

• 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 wiring harness or connectors may have 

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

• The sunroof motor assembly may be defective

• The ETACS-ECU may be defective

AC305015

AC305015AF

FUSIBLE LINK (5)

AC305231

AC305231BV

CONNECTORS: C-03, C-27

C-03

C-27

AC305415

AC305415

C-212

C-215

C-205

AX

JUNCTION BLOCK

(FRONT VIEW)

CONNECTORS: C-205, C-212, C-215

AC305413AL

CONNECTOR: C-218

C-218 (GR)

AC305264

AC305264

AN

CONNECTOR: D-04

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-96

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

• MB991910: MUT-III Main Harness A

STEP 1. Check sunroof motor assembly connector D-04 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

Q: Is sunroof motor assembly connector D-04 in good 

condition?
YES : Go to Step 2.
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-ECU normally.

STEP 2. Check the fusible link (5) line of power supply 
circuit to the sunroof motor assembly. Measure the voltage 
at sunroof motor assembly connector D-04.

(1) Disconnect sunroof motor assembly connector D-04 and 

measure the voltage available at the wiring harness side of 

the connector.

(2) Measure the voltage between terminal 1 and ground.

• The voltage should measure 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 3.

AC305264

AC305264

AM

CONNECTOR: D-04

HARNESS SIDE

AC305264

AC305264

AM

CONNECTOR: D-04

HARNESS SIDE

AC209365 FG

CONNECTOR D-04
(HARNESS SIDE)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-97

STEP 3. Check the wiring harness between sunroof motor 
assembly connector D-04 (terminal 1) and fusible link (5).

AC305015

AC305015AF

FUSIBLE LINK (5)

AC305264

AC305264

AM

CONNECTOR: D-04

HARNESS SIDE

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-98

NOTE: Also check junction block connectors C-212, C-215 and 
intermediate connector C-27 for loose, corroded, or damaged 
terminals, or terminals pushed back in the connector. If junction 
block connector C-212, C-215 or intermediate connector C-27 
is damaged, repair or replace the damaged component(s) as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between sunroof motor assembly 

connector D-04 (terminal 1) and fusible link (5) 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 system 
should communicate with the sunroof-ECU normally.

AC305231

AC305231

CONNECTOR: C-27

BT

AC305416

AC305416

C-212

HARNESS SIDE

HARNESS SIDE

C-215

CONNECTORS: C-212, C-215

AI

C-212

C-215

JUNCTION BLOCK

(FRONT VIEW)