Mitsubishi 380. Instruction - page 49

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-193

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

.

CIRCUIT OPERATION

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

• Dome lamp answerback function

• Turn-signal lamp answerback function

• Horn answerback function

.

TECHNICAL DESCRIPTION (COMMENT)

The turn-signal lamps and horn answerback func-
tions can be disabled or enabled. However, the dome
lamp answerback function cannot be disabled.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The turn-signal lamp may be defective

• The dome lamp 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

AC305992AB

CONNECTOR: A-06X

16DB355A

A-36 (B)

CONNECTOR: A-36,A-37

A-37

16DB353A

CONNECTOR: C-29

16DB354A

CONNECTOR: C-217

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-194

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: diagnostic 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-191

."

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.

STEP 3. Verify trouble symptom.

Q: Which answerback function is defective?

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

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

STEP 4. Verify the dome lamp.

Q: Does the dome lamp illuminate normally?

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

functions work normally.

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

do not illuminate and go out normally

P.54B-359

."

STEP 5. Verify the hazard warning lamp.

Q: Does the hazard warning lamp work normally?

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

functions work normally.

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

lamps do not flash when the hazard warning lamp
switch is turned on

P.54B-314

."

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-195

STEP 6. Verify which horn is defective.

Q: Which horn does not sound?

Horn (HIGH) : Go to Step 7.
Horn (LOW) : Go to Step 11.
Both horns : Go to Step 15.

STEP 7. Check horn connector A-37 (HIGH) for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is horn (HIGH) connector A-37 in good condition?

YES : Go to Step 8.
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 8. Check the horn (HIGH).
Connect the battery as shown, and verify that the horn sounds.

Q: Is the horn normal?

YES : Go to Step 9.
NO : Replace the horn (HIGH). Verify that the horn sounds

normally.

STEP 9. 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 10.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the horn sounds normally.

16DB355A

A-36 (B)

CONNECTOR: A-36,A-37

A-37

ACX02352

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-196

STEP 10. Check the wiring harness between horn relay
connector A-06X (terminal 4) and horn (HIGH) connector
A-37 (terminal 1).
Q: Is the wiring harness between horn relay connector

A-06X (terminal 4) and horn (HIGH) connector A-37
(terminal 1) in good condition?
YES :
Replace the ETACS-ECU. Verify that the horn sounds

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 horn sounds normally.

STEP 11. Check horn connector A-36 (LOW) for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is horn (LOW) connector A-36 in good condition?

YES : Go to Step 12.
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 12. Check the horn (LOW).
Connect the battery as shown, and verify that the horn sounds.

Q: Is the horn normal?

YES : Go to Step 13.
NO : Replace the horn (LOW). Verify that the horn sounds

normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

16DB355A

A-36 (B)

CONNECTOR: A-36,A-37

A-37

16DB355A

A-36 (B)

CONNECTOR: A-36,A-37

A-37

ACX02352

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