Mitsubishi Galant 9G. Manual - part 93

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-368

JUNCTION BLOCK

22

RELAY BOX
(FUSE     )

ETACS-
ECU

FRONT COMBINATION
LIGHT (LH)

REAR COMBINATION
LIGHT (LH)

REAR COMBINATION
LIGHT (RH)

FRONT COMBINATION
LIGHT (RH)

IGNITION
SWITCH (IG1)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-369

INSPECTION PROCEDURE I-1: Flasher Timer: Turn-signal lights do not flash when the turn-signal 
light switch is turned on.

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

."

.

BATTERY

RELAY
BOX

ETACS-ECU

JUNCTION BLOCK

FRONT
COMBINATION
LIGHT (LH)

FRONT
COMBINATION
LIGHT (RH)

REAR
COMBINATION
LIGHT (LH)

REAR
COMBINATION
LIGHT (RH)

TURN-SIGNAL
LIGHT RELAY: LH

TURN-SIGNAL
LIGHT RELAY: RH

JUNCTION BLOCK SIDE

Turn-Signal Light Power Supply Circuit

AC305415

CONNECTORS: C-204, C-214

AQ

C-204

C-214

AC305413AB

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-370

CIRCUIT OPERATION

• The turn-signal light switch sends a signal 

through the column-ECU (incorporated in the col-
umn switch) to the ETACS-ECU. If the col-
umn-ECU sends a turn-signal light switch "ON" 
signal to the ETACS-ECU, the ETACS-ECU turns 
on the flasher timer (incorporated in the 
ETACS-ECU), thus causing the turn-signal lights 
to flash.

• The ETACS-ECU operates the turn-signal lights 

according to the following signals:

• Ignition switch (IG1): ON

• Turn-signal light switch: ON

• The ETACS-ECU flashes the turn-signal lights 

under the following conditions:

• Ignition key: "ON" position

• Turn-signal light switch: Left or right turn-sig-

nal position

.

TECHNICAL DESCRIPTION (COMMENT)

If the turn-signal lights do not flash normally, the input 
circuits from the switches described in "CIRCUIT 
OPERATION" or the ETACS-ECU may be defective. 
If the hazard warning lights do not flash, the power 
supply line to the ETACS-ECU (dedicated to the 
turn-signal lights) may be defective.

.

TROUBLESHOOTING HINTS

• Trouble in input signal system

• The wiring harness or connectors may have 

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

• The ETACS-ECU may be defective

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 hazard warning light.
Q: Do the hazard warning lights work normally?

YES : Go to Step 7.
NO :  Go to Step 2.

STEP 2. Check the turn-signal lights.
Q: Does either of the turn-signal lights illuminate?

Only right or left side light does not illuminate. : Go to 

Step 3.

Turn-signal lights do not illuminate at all : Go to Step 4.

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-371

STEP 3. Check ETACS-ECU connector C-219, junction 
block connectors C-214 and C-204 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are ETACS-ECU connector C-219, junction block 

connectors C-214 and C-204 in good condition?
YES : Replace the ETACS-ECU. Verify that the turn-signal 

lights illuminate normally.

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 4. 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 5.
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.

AC305416

CONNECTORS: C-204, C-214

JUNCTION BLOCK
(FRONT VIEW)

C-204

C-214

HARNESS SIDE

C-204

C-214

HARNESS SIDE

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AG

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)