2005 MITSUBISHI 380 Workshop Manual

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-129
INSPECTION PROCEDURE C-2: Central Door Locking System: Some Doors do not Lock or Unlock.
.
CIRCUIT OPERATION
The ETACS-ECU operates the central door lock
system according to the following signals:
Front door lock actuator switch
Door lock key cylinder switch
Door lock switch, which is incorporated in the
power window main switch or front power win-
dow sub switch
The ETACS-ECU locks or unlocks all the doors
(except liftgate and glass hatch lock) by operating
the central door lock relay (incorporated in the
ECU) in response to input signals.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-130
.
TECHNICAL DESCRIPTION (COMMENT)
The wiring harness between the door lock actuator or
the ETACS-ECU and the door lock actuator may be
defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The front door lock actuator or rear door lock
actuator may be defective
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 Tool:
MB991223: Harness Set
STEP 1. Check which door lock is defective.
Q: Which of the door locks is defective?
Driver's door : Go to Step 2.
Front passenger's door : Go to Step 7.
Rear door (LH) : Go to Step 11.
Rear door (RH) : Go to Step 15.
STEP 2. Check front door lock actuator (RH) connector
E-05 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is front door lock actuator (RH) connector E-05 in good
condition?
YES : Go to Step 3.
NO : Repair or check the connector. Refer to GROUP 00E,
Harness Connector Inspection P.00E-2. Verify that all
the doors can be locked and unlocked normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-131
STEP 3. Check the front door lock actuator (RH).
Remove the front door lock actuator (RH). The illustration
shows when the door lock actuator is viewed from inside the
door. Refer to GROUP 42
Door Handle and Latch P.42-46.
Q: Does the front door lock actuator (RH) work normally?
YES : Go to Step 4.
NO : Replace the front door lock actuator (RH). Verify that
all the doors can be locked and unlocked normally.
STEP 4. Check ETACS-ECU connectors C-217 and C-219
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Are ETACS-ECU connectors C-217 and C-219 in good
condition?
YES : Go to Step 5.
NO : Repair or check the connector. Refer to GROUP 00E,
Harness Connector Inspection P.00E-2. Verify that all
the doors can be locked and unlocked normally. LEVER
POSITIONBATTERY
CONNECTIONLEVER
OPERATION
At the "LOCK"
position
Connect terminal 4
to the negative
battery terminal
Connect terminal 6
to the positive
battery terminalThe lever moves
from the "LOCK"
position to the
"UNLOCK"
position.
At the
"UNLOCK"
position
Connect terminal 6
to the negative
battery terminal
Connect terminal 4
to the positive
battery terminalThe lever moves
from the "UNLOCK"
position to the
"LOCK" position.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-132
STEP 5. Check the wiring harness between ETACS-ECU
connector C-217 (terminal 22) and front door lock actuator
(RH) connector E-05 (terminal 6).
NOTE: Also check intermediate connector C-12 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-12 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 ETACS-ECU connector
C-217 (terminal 22) and front door lock actuator (RH)
connector E-05 (terminal 6) in good condition?
YES : Go to Step 6.
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 or replace the damaged component(s). Verify
that the central door locking system works normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-133
STEP 6. Check the wiring harness between ETACS-ECU
connector C-219 (terminal 12) and front door lock actuator
(RH) connector E-05 (terminal 4).
NOTE: Also check intermediate connector C-12 and junction
block connector C-211 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector C-12 or junction block connector C-211 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 ETACS-ECU connector
C-219 (terminal 12) and front door lock actuator (RH)
connector E-05 (terminal 4) in good condition?
YES : Replace the ETACS-ECU. Verify that all the doors
can be locked and unlocked 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 or replace the damaged component(s). Verify
that the central door locking system works normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-134
STEP 7. Check front door lock actuator (LH) connector
E-15 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is front door lock actuator (LH) connector E-15 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 all the doors can be locked and
unlocked normally.
STEP 8. Check the front door lock actuator (LH).
Remove the front door lock actuator (LH). The illustration
shows when the door lock actuator is viewed from inside the
door. Refer to GROUP 42
Door Handle and Latch P.42-46.
Q: Is the front door lock actuator (LH) normal?
YES : Go to Step 9.
NO : Replace the front door lock actuator (LH). Verify that
all the doors can be locked and unlocked normally.
LEVER
POSITIONBATTERY
CONNECTIONLEVER
OPERATION
At the "LOCK"
position
Connect terminal 4
to the negative
battery terminal
Connect terminal 6
to the positive
battery terminalThe lever moves
from the "LOCK"
position to the
"UNLOCK"
position.
At the
"UNLOCK"
position
Connect terminal 6
to the negative
battery terminal
Connect terminal 4
to the positive
battery terminalThe lever moves
from the
"UNLOCK" position
to the "LOCK"
position.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-135
STEP 9. 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 10.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that all the doors can be locked and
unlocked normally.
STEP 10. Check the wiring harness between ETACS-ECU
connector C-219 (terminals 12 and 13) and front door lock
actuator (LH) connector E-15 (terminals 4 and 6).

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-136
NOTE: Also check intermediate connector C-26 and junction
block connector C-211 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector C-26 or junction block connector C-211 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 ETACS-ECU connector
C-219 (terminals 12 and 13) and front door lock actuator
(LH) connector E-15 (terminals 4 and 6) in good
condition?
YES : Replace the ETACS-ECU. Verify that all the doors
can be locked and unlocked 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.
STEP 11. Check rear door lock actuator (LH) connector
E-18 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is rear door lock actuator (LH) connector E-18 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 all the doors can be locked and
unlocked normally.