Mitsubishi Galant (2004+). Manual - part 260

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-231

INSPECTION PROCEDURE E-2: Keyless Entry System: The dome light, the turn-signal lights and the 
horn do not operate through the answerback function.

ETACS-ECU

HORN
RELAY

RELAY
BOX

BATTERY

HORN

Horn Drive Circuit

AC305992AB

CONNECTOR: A-06X

AC305206AD

CONNECTOR:A-36

A-36 (B)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-232

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CIRCUIT OPERATION
The ETACS-ECU operates the following functions 
when it receives lock or unlock signal from the trans-
mitter:

• Dome light answerback function

• Turn-signal light answerback function

• Horn answerback function

.

TECHNICAL DESCRIPTION (COMMENT)
The turn-signal lights and horn answerback functions 
can be disabled or enabled. However, the dome light 
answerback function cannot be disabled.

.

TROUBLESHOOTING HINTS

• The turn-signal light may be defective

• The dome light may be defective

• The horn may be defective

• The ETACS-ECU may be defective

• The wiring harness or connectors may have 

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

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. Verify the keyless entry system.
Q: Does the keyless entry system work normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure E-1 "Keyless entry 

system does not operate 

P.54B-229

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STEP 2. Check the configuration function.
Q: Has the answerback function been enabled by means of 

the adjustment function?
YES : Go to Step 3.
NO :  Enable the answerback function by means of the 

adjustment function. Verify that the answerback 
functions work normally.

AC305231

CONNECTOR: C-29

AH

AC305413AD

CONNECTOR: C-217

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-233

STEP 3. Verify trouble symptom.
Q: Which answerback function is defective?

Only the dome light : Go to Step 4.
Only the turn-signal lights : Go to Step 5.
Only the horn : Go to Step 6.
Dome light, turn-signal lights and horn : Replace the 

ETACS-ECU. Verify that the answerback functions 
work normally.

STEP 4. Verify the dome light.
Q: Does the dome light illuminate normally?

YES : Replace the ETACS-ECU. Verify that the answerback 

functions work normally.

NO :  Refer to Inspection Procedure K-1 "The dome light do 

not illuminate and go out normally 

P.54B-433

."

STEP 5. Verify the hazard warning light.
Q: Does the hazard warning light work normally?

YES : Replace the ETACS-ECU. Verify that the answerback 

functions work normally.

NO :  Refer to Inspection Procedure I-2 "Hazard warning 

lights do not flash when the hazard warning light 
switch is turned on 

P.54B-388

."

STEP 6. Check horn connector A-36 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.

Q: Is horn connector A-36 in good condition?

YES : Go to Step 7.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the horn sounds normally.

STEP 7. Check the horn.

Connect the battery as shown, and verify that the horn sounds.
Q: Is the horn normal?

YES : Go to Step 8.
NO :  Replace the horn. Verify that the horn sounds 

normally.

AC305206

CONNECTOR: A-36

AE

A-36 (B)

HARNESS SIDE

ACX02352

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-234

STEP 8. Check horn relay connector A-06X for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is horn relay connector A-06X in good condition?

YES : Go to Step 9.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the horn sounds normally.

STEP 9. Check the horn relay.

Q: Is the horn relay normal?

YES : Go to Step 10.
NO :  Replace the horn relay. Verify that the horn sounds 

normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

BATTERY 
VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

1 

− 4

Open circuit

• Connect 

terminal 2 to the 
positive battery 
terminal

• Connect 

terminal 3 to the 
negative battery 
terminal

1 

− 4

Less than 2 ohms

AC306638

1

4

3

2

2

1

3

4

FRONT OF 
VEHICLE

HORN RELAY

AB

CONNECTOR: A-06X