Mitsubishi 380. Manual - part 36

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-141

NOTE: Also check junction block connector C-204 and inter-
mediate connectors D-36 for loose, corroded, or damaged ter-
minals, or terminals pushed back in the connector. If junction
block connector C-204 or intermediate connector D-36 is dam-
aged, 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 rear door lock actuator
(RH) connector E-08 (terminals 6 and 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 the wiring harness as necessary. Verify that all
the doors can be locked and unlocked normally.

AC400530

CONNECTOR: D-36

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-142

INSPECTION PROCEDURE C-3: Central Door Locking System: All the Doors do not Lock or Unlock
with just the Door Lock Switch Operation.

TECHNICAL DESCRIPTION (COMMENT)

The door lock switch (incorporated in the power win-
dow main switch and front power window sub switch)
or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• 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: diagnostic tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

Check the input signal (by using the pulse check mode of
the monitor).
Check the input signals from the door lock switch (incorporated
in the power window main switch and front power window sub
switch):

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-13

(2) When the driver's or the front passenger's door lock switch

is moved from "LOCK" to "UNLOCK" and vice versa, check
if diagnostic tool MB991958 sounds or not.

(3) Operate diagnostic tool MB991958 according to the

procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "Pulse Checking."

Q: Does diagnostic tool MB991958 sound when the driver's

or the front passenger's door lock switch is moved from
"LOCK" to "UNLOCK" and vice versa?
YES : Replace the ETACS-ECU. Check that all the doors

should be locked and unlocked by the door lock
switch.

NO : Refer to Inspection Procedure N-6 "ETACS-ECU

does not receive any signal from the door lock switch
(incorporated in the power window main switch and
front power window sub switch)

P.54B-460

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-143

INSPECTION PROCEDURE C-4: Central Door Locking System: All the Doors do not Lock or Unlock
with just the Door Lock Key Cylinder Key Operation.

TECHNICAL DESCRIPTION (COMMENT)

The door lock key cylinder switch or the ETACS-ECU
may be defective.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• 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: diagnostic tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

Check the input signal (by using the pulse check mode of
the monitor).
Check the input signals from the door lock key cylinder switch.

CAUTION

monitor

P.54B-13

(2) When the doors are locked and unlocked by using the

driver's door lock key cylinder, check that diagnostic tool
MB991958 sounds.

(3) Operate diagnostic tool MB991958 according to the

procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "Pulse Checking."

Q: When the doors are locked and unlocked by using the

driver's door lock key cylinder, does diagnostic tool
MB991958 sound?
YES : Replace the ETACS-ECU. Check that all the doors

should be locked and unlocked by using driver door
lock key cylinder switch.

NO : Refer to Inspection Procedure N-4 "ETACS-ECU

does not receive any signal from the door lock key
cylinder switch

P.54B-446

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-144

INSPECTION PROCEDURE C-5: Central Door Locking System: Forgotten Key Prevention Function
does not Work Normally.

NOTE: This troubleshooting procedure requires use
of diagnostic tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to connect SWS monitor

P.54B-13

CIRCUIT OPERATION

The ETACS-ECU operates the forgotten key preven-
tion function according to the following switches:

• Key reminder switch: OFF

• Front door switch: ON

• Front door lock actuator switch: being turned on

The ETACS-ECU operates the forgotten key preven-
tion function under the following conditions:

• Ignition key: inserted into the ignition key cylinder

• Front door: open

• Front door lock: being locked

TECHNICAL DESCRIPTION (COMMENT)

If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• 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

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