Mitsubishi Galant 9G. Manual — part 35

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-136

ETACS-
ECU

JUNCTION BLOCK

FRONT POWER
WINDOW
SUB SWITCH

KEY
REMINDER
SWITCH

POWER
WINDOW
MAIN SWITCH

FRONT DOOR
SWITCH
(LH)

FRONT DOOR
SWITCH
(RH)

REAR DOOR
SWITCH
(LH)

REAR DOOR
SWITCH
(RH)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-137

INSPECTION PROCEDURE C-1: Central Door Locking System: The Central Door Locking System
does not Work at all.

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

P.54B-15

."

JUNCTION
BLOCK

ETACS-
ECU

FUSIBLE
LINK

1

JUNCTION
BLOCK SIDE

FRONT DOOR
LOCK ACTUATOR
(LH)

UNLOCK
RELAY

LOCK
RELAY

Central Door Lock Power Supply Circuit

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-138

.

CIRCUIT OPERATION

• The ETACS-ECU controls the central door lock

system, locking or unlocking all the doors by acti-
vating the central door lock relay (built into the
ETACS-ECU). The ETACS-ECU uses inputs from
the following components:

• Front door lock actuator

• Front door lock key cylinder switch

• Door lock switch, which is incorporated in the

power window main switch or front power win-
dow sub switch

.

TROUBLESHOOTING HINTS

• 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

AC305015AD

FUSIBLE LINK (1)

AC305231AJ

CONNECOTRS: C-26, C-29

C-29

C-26

AC305415

C-211

CONNECTORS: C-211, C-216

C-216 (B)

AF

JUNCTION BLOCK

(FRONT VIEW)

AC305413

C-219

C-217

CONNECTORS: C-217, C-219

AF

JUNCTION BLOCK

(REAR VIEW)

AC305262

E-15 (B)

CONNECTOR: E-15

AM

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-139

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

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

STEP 1. Use scan tool MB991958 to select "ECU COMM
Check" on the SWS monitor display.
Check the ETACS-ECU.

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. Connect
special tool MB991910 before connecting special tool
MB991812. Be sure to connect special tool MB991806 after
turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-13

."

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure

below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

(4) MUT-III should show "OK" on the "ECU COMM Check"

menu for the "ETACS ECU" menu.

Q: Is "OK" displayed for the "ETACS ECU" menu?

YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication

with the ETACS-ECU is not possible

P.54B-78

."

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB