2005 MITSUBISHI 380 Workshop Manual

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

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.

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.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-197
STEP 13. 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 14.
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 14. Check the wiring harness between horn relay
connector A-06X (terminal 4) and horn (LOW) connector
A-36 (terminal 1).
Q: Is the wiring harness between horn relay connector
A-06X (terminal 4) and horn (LOW) connector A-36
(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.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-198
STEP 15. 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 16.
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 16. Check the horn relay.
Q: Is the horn relay normal?
YES : Go to Step 17.
NO : Replace the horn relay. Verify that the horn sounds
normally.
BATTERY
VOLTAGETESTER
CONNECTIONSPECIFIED
CONDITION
Not applied 1
4 Open circuit
Connect
terminal 2 to the
positive battery
terminal
Connect
terminal 3 to the
negative battery
terminal1
4 Less than 2 ohms

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-199
STEP 17. Check the battery power supply circuit to the
horn relay. Measure the voltage at horn relay connector
A-06X.
(1) Disconnect horn relay connector A-06X and measure the
voltage available at the relay box side of the connector.
(2) Measure the voltage between terminal 1 and ground, and
also between terminal 2 and ground.
The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 19.
NO : Go to Step 18.
STEP 18. Check the wiring harness between horn relay
connector A-06X (terminals 1 and 2) and the battery.
Q: Is the wiring harness between horn relay connector
A-06X (terminals 1 and 2) and the battery in good
condition?
YES : No action is necessary and testing is complete.
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 19. Check ETACS-ECU connector C-217 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-217 in good condition?
YES : Go to Step 20.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the horn sounds normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-200
STEP 20. Check the wiring harness between horn relay
connector A-06X (terminal 3) and ETACS-ECU connector
C-217 (terminal 44).
NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-29 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 horn relay connector
A-06X (terminal 3) and ETACS-ECU connector C-217
(terminal 44) in good condition?
YES : Go to Step 21.
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.