Mitsubishi Galant 9G. Manual — part 44

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-172

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CIRCUIT OPERATION

The ETACS-ECU turns on the power window relay
(installed on the junction block) to activate the power
windows when the ignition switch (IG1) is turned to
the "ON" position.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The power window relay may be defective

• The power window main switch may be defective

• The ETACS-ECU may be defective

AC305015

FUSIBLE LINK No.5

AI

AC305231AB

CONNECTOR: C-26

AC305415AB

C-212

CONNECTORS: C-203, C-211,C-212,C-215

C-203

C-211

C-215

JUNCTION BLOCK

(FRONT VIEW)

AC305413AB

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

AC305262AB

CONNECTOR: E-12

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

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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

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(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-78

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AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

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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 the 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 "IG SW (IG1)" as

normal condition?
YES : Go to Step 3.
NO : Refer to Inspection Procedure M-2 "ETACS-ECU

does not receive any signal from the ignition switch
(IG1)

P.54B-470

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STEP 3. Check power window relay connector C-203 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is power window relay connector C-203 in good

condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. The power windows function should now

work normally.

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 30

IG SW (IG1)

ON

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

AC305415 AC

JUNCTION BLOCK SIDE

CONNECTOR:C-203

JUNCTION BLOCK

(FRONT VIEW)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-175

STEP 4. Check the power window relay.

Q: Is the power window relay normal?

YES : Go to Step 5.
NO : Replace the power window relay. Verify that the

power windows work normally.

STEP 5. Check the battery power supply circuit to the
power window relay. Measure the voltage at power window
relay connector C-203.
(1) Disconnect power window relay connector C-203 and

measure the voltage available at the junction block side of
the connector.

(2) Measure the voltage between terminal 5 and ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Go to Step 7.
NO : Go to Step 6.

BATTERY
CONNECTION

TESTER
CONNECTION

SPECIFIED
CONDITION

Not applied

4

− 5

Open circuit

• Connect terminal 1

to the positive
battery terminal

• Connect terminal 3

to the negative
battery terminal

4

− 5

Less than 2
ohms

AC305415 AC

JUNCTION BLOCK SIDE

CONNECTOR:C-203

JUNCTION BLOCK

(FRONT VIEW)

AC401493

1

3

4

5

1 2

4

5

3

AB

AC305415 AC

JUNCTION BLOCK SIDE

CONNECTOR:C-203

JUNCTION BLOCK

(FRONT VIEW)

1

2

3

4

5

AC201553

CONNECTOR: C-203
(JUNCTION BLOCK SIDE)

AE