Mitsubishi Galant (2004+). Manual - part 303

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-403

STEP 24. Check ETACS-ECU connector C-219 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is ETACS-ECU connector C-219 in good condition?

YES : Go to Step 25.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the turn-signal lights illuminate 

normally.

STEP 25. Check the wiring harness between rear 
combination light (RH) connector F-03 (terminal 5) and 

ETACS-ECU connector C-219 (terminal 9).

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC305260

AH

CONNECTOR: F-03

HARNESS SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-404

NOTE: Also check junction block connector C-204 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector C-204 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 rear combination light 

(RH) connector F-03 (terminal 5) and ETACS-ECU 
connector C-219 (terminal 9) in good condition?
YES : Replace the rear combination light socket assembly 

(RH). Verify that the turn-signal lights illuminate 
normally.

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. Verify that 
the turn-signal lights illuminate normally.

INSPECTION PROCEDURE I-4: The turn-signal light indicator does not illuminate normally.

NOTE: This troubleshooting procedure requires the 
use of scan tool MB991958 and SWS monitor kit 
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor 

P.54B-15

."

.

CIRCUIT OPERATION
At the same time that the turn-signal lights are illumi-
nated, the ETACS-ECU sends a signal to illuminate 
the turn-signal light indicator via the CAN bus line.

.

TECHNICAL DESCRIPTION (COMMENT)
If the turn-signal indicator does not illuminate nor-
mally, connector(s), wiring harness in the CAN bus 
lines, the ETACS-ECU or the combination meter 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 combination meter may be defective

• The ETACS-ECU may be defective

.

AC305415AJ

CONNECTOR: C-204

HARNESS SIDE

JUNCTION BLOCK

(FRONT VIEW)

INPUT SIGNAL

ETACS-
ECU

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

· 

HAZARD WARNING LIGHT 

SWITCH

 

· TURN-SIGNAL 

LIGHT 

SWITCH

Turn-signal Lights Indicator Light Circuit

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-405

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

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

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

• MB991822: Probe Harness

STEP 1. Check the turn-signal lights.

When the column switch or the hazard warning light switch are 
operated, check that the turn-signal lights illuminate and go off 
normally.
Q: Are the turn-signal lights in good condition?

YES : Go to Step 2.
NO :  First, repair the turn-signal light(s). Refer to Inspection 

Procedure I-3 "One of the turn-signal lights does not 
illuminate 

P.54B-390

."

STEP 2. Using scan tool MB991958, diagnose the CAN bus 
line.

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 MB991958.Refer to "How to connect 

SWS monitor 

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-406

STEP 3. Using scan tool MB991958, read the METER 
diagnostic trouble code.

Check whether the combination meter-related DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether a combination meter-related DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the combination meter. Refer to 

P.54A-56

.

NO :  Go to Step 4.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827