Mitsubishi Galant 9G. Manual — part 24

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-92

NOTE: Also check joint connector C-03 and intermediate con-
nector C-29 for loose, corroded, or damaged terminals, or ter-
minals pushed back in the connector. If joint connector C-03 or
intermediate connector C-29 is damaged, repair or replace the
connector as described in GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Is the wiring harness between front-ECU connector

A-12X (terminal 30) and ETACS-ECU connector C-218
(terminal 59) in good condition?
YES : Go to Step 10.
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 front-ECU normally.

STEP 10. Replace the front-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.

AC305232

CONNECTOR: C-03, C-29

C-03

C-29

C-03

C-29

AL

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-93

INSPECTION PROCEDURE A-5: Communication with the Sunroof-ECU is not Possible.

IGNITION
SWITCH (IG2)

SUNROOF MOTOR
ASSEMBLY

SUNROOF-ECU

ETACS-ECU

FUSIBLE
LINK

5

JOINT
CONNECTOR
(2)

JUNCTION
BLOCK

JUNCTION
BLOCK

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

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-94

.

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)

AC400530

AP

CONNECTOR: D-04

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-95

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.

AC400530

AI

CONNECTOR: D-04

HARNESS SIDE

AC400530

AI

CONNECTOR: D-04

HARNESS SIDE

AC209365 FG

CONNECTOR D-04
(HARNESS SIDE)