Mitsubishi Galant 9G. Manual — part 41

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-160

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

• 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

DOOR LOCK
ACTUATOR

INPUT SIGNAL

DOOR LOCK KEY CYLINDER SWITCH

FUSIBLE
LINK

1

JUNCTION BLOCK SIDE

JUNCTION BLOCK

ETACS-ECU

Central Door Lock (Door Lock Key Cylinder Switch) Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-161

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

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

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

monitor

P.54B-13

."

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

driver's or front passenger's door lock key cylinder, check
that scan tool MB991958 sounds.

(3) Operate scan 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 or front passenger's door lock key cylinder,
does scan tool MB991958 sound?
YES : Replace the ETACS-ECU. Check that all the doors

should be locked and unlocked by using each 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-512

."

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-162

INSPECTION PROCEDURE C-5: Central Door Locking System: All the Doors do not Lock or Unlock
with just the Driver's or Front Passenger's inside Lock Knob Operation.

.

TECHNICAL DESCRIPTION

The door lock actuator or the ETACS-ECU may be
defective.

.

TROUBLESHOOTING HINTS

• 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

DOOR LOCK
ACTUATOR

INPUT SIGNAL

·FRONT DOOR LOCK ACTUATOR (LH)

FUSIBLE
LINK

1

JUNCTION BLOCK SIDE

JUNCTION BLOCK

ETACS-ECU

·FRONT DOOR LOCK ACTUATOR (RH)

Central Door Lock (Door Lock Key Cylinder Switch) Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-163

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

Check the input signal (by using the pulse check mode of
the monitor).
Check the input signals from the driver's or front passenger's
door lock actuator.

CAUTION

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

monitor

P.54B-13

."

(2) When the driver's inside lock knob is locked or unlocked,

check if scan tool MB991958 sounds or not.

(3) Operate scan 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 scan tool MB991958 sound when the driver's or

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

can be locked or unlocked by operating the driver's
inside lock knob.

NO : Refer to Inspection Procedure N-5 "ETACS-ECU

does not receive any signal from the front door lock
actuator

P.54B-517

."

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827