Mitsubishi Galant 9G. Manual — part 133

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-528

.

CIRCUIT OPERATION

The ETACS-ECU operates the central door locking
system according to signal from the door lock switch
(incorporated in the power window main switch and
front power window sub switch).

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the doors will not lock or
unlock. If the signal is not normal, the power window
main switch, front power window sub switch or the
ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The power window main switch or front power

window sub switch may be defective

• 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 Tool:

• 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

AC305262AB

CONNECTOR: E-12

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-529

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

SWS monitor

P.54B-13

."

(2) 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."

(3) Check that scan tool MB991958 sounds.
Q: When the door lock switch (incorporated in the power

window main switch and front power window sub
switch) is operated, does the scan tool MB991958
sound?
When the door lock switch (incorporated in the power
window main switch) is operated, the scan tool
MB991958 does not sound. : Go to Step 2.
When the door lock switch (incorporated in the front
power window sub switch) is operated, the scan tool
MB991958 does not sound. : Go to Step 8.

STEP 2. Check power window main switch connector E-12
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is power window main switch connector E-12 in good

condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. If the central door locking system works

normally, input signal from the door lock switch
(power window main switch) should be normal.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305262

3
9

4

12

14

6

13

5

1110

8

2

7

1

HARNESS SIDE

CONNECTOR:E-12

AC

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-530

STEP 3. Check the door lock switch (power window main
switch).
Remove the power window main switch. Refer to GROUP 42,
Door, Door Glass and Regulator

P.42-39

. Then check continu-

ity between the switch terminals.

Q: Is the door lock switch (power window main switch) in

good condition?
YES : Go to Step 4.
NO : Replace the power window main switch. If the central

door locking system works normally, input signal from
the door lock switch (power window main switch)
should be normal.

STEP 4. Check the ground circuit to the power window
main switch. Measure the resistance at power window
main switch connector E-12.
(1) Disconnect power window main switch connector E-12 and

measure the resistance available at the wiring harness side
of the connector.

(2) Measure the resistance value between terminal 12 and

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 6.
NO : Go to Step 5.

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

LOCK

5

− 12

Less than 2 ohms

OFF

5

− 12, 10 − 12

Open circuit

UNLOCK

10

− 12

Less than 2 ohms

5

4

6

13

3

2

1

14

12

11

10

9

8

7

AC006121

AC305262

3
9

4

12

14

6

13

5

1110

8

2

7

1

HARNESS SIDE

CONNECTOR:E-12

AC

3
9

4

12

14

6

13

5

1110

8

2

7

1

AC209831

CONNECTOR E-12
(HARNESS SIDE)

AC

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-531

STEP 5. Check the wiring harness between power window
main switch E-12 (terminal 12) and ground.

NOTE: Also check intermediate connector C-26 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-26 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

Q: Is the wiring harness between power window main

switch connector E-12 (terminal 12) and ground in good
condition?
YES : No action is necessary and testing is complete.
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. If the central
door locking system works normally, input signal from
the door lock switch (power window main switch)
should be normal.

STEP 6. Check ETACS-ECU connector C-217 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-217 in good condition?

YES : Go to Step 7.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. If the central door locking system works

normally, input signal from the door lock switch
(power window main switch) should be normal.

AC305262

3
9

4

12

14

6

13

5

1110

8

2

7

1

HARNESS SIDE

CONNECTOR:E-12

AC

AC305231

CONNECTOR: C-26

AK

AC305413AH

CONNECTOR: C-217

HARNESS SIDE

25

26

27

28

29

21

22

23

24

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

JUNCTION BLOCK

(REAR VIEW)