Mitsubishi Galant (2004+). Manual - part 331

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-515

INSPECTION PROCEDURE M-8: Sunroof Switch: ETACS-ECU does not receive any signal from the 
up, open, or close/down switch.

SUNROOF MOTOR 
ASSEMBLY

OVERHEAD 
CONSOLE 
ASSEMBLY

SUNROOF-ECU

SUNROOF 
SWITCH

JOINT 
CONNECTOR (3)

ETACS-
ECU

Sunroof Switch Input Circuit

AC305231

AC305231BV

CONNECTORS: C-03, C-27

C-03

C-27

AC305413AL

CONNECTOR: C-218

C-218 (GR)

AC305264

AC305264

AN

CONNECTOR: D-04

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-516

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CIRCUIT OPERATION
The ETACS-ECU receives a signal through the sun-
roof motor assembly via the SWS communication 
line from the sunroof switch, and sends a signal to 
the data link connector.

.

TECHNICAL DESCRIPTION (COMMENT)
If the SWS communication line between the sunroof 
motor assembly and the ETACS-ECU is defective, 
the ETACS-ECU cannot identify the input signal from 
the sunroof switch even if the sunroof is normal.

.

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

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set

STEP 1. Check the sunroof operation.
Q: Does the sunroof work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure F-1 "Sunroof does not 

operate 

P.54B-247

."

STEP 2. Check sunroof motor assembly connector D-04 
and ETACS-ECU connector C-218 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.

Q: Are sunroof motor assembly connector D-04 and 

ETACS-ECU connector C-218 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

. If the sunroof operates normally, a correct 

signal is sent from the sunroof switch.

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

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AC305264

AC305264

AM

CONNECTOR: D-04

HARNESS SIDE

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-517

STEP 3. Check the wiring harness between sunroof motor 
assembly connector D-04 (terminal 10) and ETACS-ECU 
connector C-218 (terminal 59).

NOTE: Also check intermediate connector C-27 and joint con-
nector C-03. If intermediate connector C-27 or joint connector 
C-03 is damaged, repair or replace the connector as described 
in GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Q: Is the wiring harness between sunroof motor assembly 

connector D-04 (terminal 10) and ETACS-ECU connector 
C-218 (terminal 59) in good condition?
YES : Go to Step 4.
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. If the sunroof 
operates normally, a correct signal is sent from the 
sunroof switch.

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

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AC305264

AC305264

AM

CONNECTOR: D-04

HARNESS SIDE

AC305232

AC305232

CONNECTORS: C-03, C-27

AI

C-03

C-27

C-27

C-03 HARNESS SIDE

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-518

STEP 4. Replace the sunroof motor assembly.

(1) Replace the sunroof motor assembly.
(2) If the sunroof operates normally, a correct signal is sent 

from the sunroof switch.

Q: Does the ETACS-ECU receive correct signals from the 

sunroof switch?
YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. If the sunroof operates 

normally, a correct signal is sent from the sunroof 
switch.

INSPECTION PROCEDURE N-1: ETACS-ECU does not receive any signal from the key reminder 
switch.

.

CIRCUIT OPERATION
The ETACS-ECU operates the following functions or 
systems according to signal from the key reminder 
switch:

• Ignition key reminder tone alarm function

• Forgotten key reminder

• Keyless entry system

• Timed locking mechanism

• Dome light dimming function

• Ignition key hole illumination light

.

KEY 
REMINDER 
SWITCH

ETACS-ECU

WHEN KEY 
IS REMOVED

Key Reminder Switch Input Circuit

AC305413

CONNECTOR: C-217

AK

JUNCTION BLOCK

(REAR VIEW)

AC305235

CONNECTOR: C-310

AD