Mitsubishi Galant (2004+). Manual - part 250

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-191

STEP 14. Check the wiring harness between power 
window relay connector C-203 (terminal 4) and power 
window main switch connector E-12 (terminal 13).

NOTE: Also check junction block connector C-215 and inter-
mediate connectors C-26 for loose, corroded or damaged ter-
minals, or terminals pushed back in the connectors. If junction 
block connector C-215 or intermediate connector C-26 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 power window relay 

connector C-203 (terminal 4) and power window main 
switch connector E-12 (terminal 13) in good condition?
YES : Replace the ETACS-ECU. The power windows 

function should now work 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. The power 
windows function should now work normally.

AC305416

JUNCTION BLOCK SIDE

C-203

HARNESS SIDE

C-215

CONNECTORS: C-203,C-215

AE

C-203

C-215

JUNCTION BLOCK

(FRONT VIEW)

AC305262

3
9

4

12

14

6

13

5

1110

8

2

7

1

HARNESS SIDE

CONNECTOR:E-12

AC

AC305231AC

CONNECTOR:C-26

HARNESS SIDE

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-192

INSPECTION PROCEDURE D-2: Power Window: The power window timer function does not work 
normally.

NOTE: This troubleshooting procedure requires 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

."

.

CIRCUIT OPERATION
The ETACS-ECU operates the power window timer 
function according to the following signals:

• Ignition switch (IG1)

• Front door switch

.

TECHNICAL DESCRIPTION (COMMENT)
If the power window timer function does not work 
normally, its input circuit, the ETACS-ECU or the 
front-ECU may be defective.

.

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

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

E

IGNITION SWITCH (IG1)

E

FRONT DOOR SWITCH

POWER WINDOW
MOTOR

5

FUSIBLE LINK

ETACS-
ECU

JUNCTION
BLOCK SIDE

POWER
WINDOW
RELAY

Power Window Timer Function Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-193

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 "ON" position.
(3) Operate the 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) Scan tool MB991958 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-79

."

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-194

STEP 2. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.

Turn the ignition switch to the "ON" position before checking 
input signals from the ignition switch (IG1).
(1) Operate scan tool MB991958 according to the procedure 

below to display "ETACS ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f. Select "ETACS ECU."

(2) Check that normal conditions are displayed for the items 

described in the table below.

Q: Does the scan tool MB991958 display the items "IG SW 

(IG1)", "FRONT DOOR SW" as normal condition?
Normal condition displayed for all the items : Replace 

the ETACS-ECU. Verify that the power window timer 
works normally.

Normal condition is not displayed for "IG SW (IG1)" : 

Refer to Inspection Procedure M-2 "ETACS-ECU 
does not receive any signal from the ignition switch 
(IG1) 

P.54B-490

."

Normal condition is not displayed for "FRONT DOOR 
SW" : Refer to Inspection Procedure M-4 "ETACS-ECU 

does not receive any signal from the front door 
switches 

P.54B-497

."

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 30

IG SW (IG1)

OFF

ITEM 32

FRONT DOOR SW

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB