Mitsubishi Galant (2004+). Manual - part 246

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-175

STEP 3. Check the input signal (by using the pulse check 
mode of the monitor).

Check the following switches and input signals:

• Key reminder switch

• Door switches

(1) 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."

(2) Check if scan tool MB991958 sounds or not.

Q: When the key reminder switch, any door switch is 

operated, does scan tool MB991958 sound?
Buzzer of scan tool MB991958 sounds normally. : 

Replace the ETACS-ECU. The forgotten key 
prevention function should work normally.

When the ignition key is removed and inserted, scan 
tool MB991958 does not sound. : Refer to Inspection 

Procedure N-1 "ETACS-ECU does not receive any 
signal from the key reminder switch 

P.54B-518

."

When one of the doors is opened and closed, scan tool 
MB991958 does not sound : Refer to Inspection 

Procedure N-3 "ETACS-ECU does not receive any 
signal from any of the door switches 

P.54B-527

."

ITEM NAME

CONDITION

key reminder switch Remove and reinsert the ignition key

Door switches

Open or close one of the doors

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-176

POWER WINDOWS

GENERAL DESCRIPTION CONCERNING THE POWER WINDOWS

M1549021900125

The following ECUs affect the functions and control 
of the power windows.

Power window main switch function

The main switch is located on the driver’s door.
Raises the driver’s power window
When the driver’s power window switch on the power window 
main switch is pulled up, the system energizes its respective 
power window motor, and then the driver’s window glass rises.

Lowers the driver’s power window
When the driver’s power window switch on the power window 
main switch is pushed down, the system energizes its respec-
tive power window motor, and then the driver’s window glass 
lowers.

FUNCTION

CONTROL ECU

Power window main 
switch function

Raises the driver’s power window

Power window main switch

Lowers the driver’s power window

Power window main switch

Lowers the driver’s power window by one-touch down 
function

Power window main switch

Raises the passenger’s power window

Power window main switch

Lowers the passenger’s power window

Power window main switch

Power window sub 
switch function

Raises the passenger’s power window

Power window sub switch

Lowers the passenger’s power window

Power window sub switch

Power window timer function

ETACS-ECU

AC106705

ON

OFF

ON

OFF

UPPER SIDE 

POWER
WINDOW
MOTOR

POWER
WINDOW
MAIN
SWITCH

DRIVER'S
POWER WINDOW
SWITCH UPPER 
SIDE

AH

AC106705

LOWER SIDE 

POWER
WINDOW
MOTOR

POWER
WINDOW
MAIN
SWITCH

DRIVER'S
POWER WINDOW
SWITCH LOWER 
SIDE

ON

OFF

ON

OFF

AI

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-177

Lowers the driver’s power window by one-touch down 
function
When the driver’s power window switch on the power window 
main switch is pushed down fully, the system energizes its 
respective power window motor, and then the driver’s window 
glass moves to its lowest position.

Raises the passenger’s power window
When the passenger’s power window switch on the power win-
dow main switch is pulled up, the system energizes its respec-
tive power window motor, and then the passenger’s window 
glass rises.

Lowers the passenger’s power window
When the passenger’s power window switch on the power win-
dow main switch is pushed down, the system energizes its 
respective power window motor, and then the passenger’s win-
dow glass lowers.

Power window sub switch function

The sub switches are located on the passenger’s doors.
Raises the passenger’s power window
When the power window sub switch is pulled up, the system 
energizes its respective power window motor, and then the 
passenger’s window glass rises.

AC106706

ON

OFF

ON

OFF

LOWER SIDE 

POWER
WINDOW
MOTOR

POWER
WINDOW
MAIN
SWITCH

DRIVER'S
POWER
WINDOW
SWITCH
LOWER SIDE

AC

AC106705

UPPER SIDE 

POWER
WINDOW
MOTOR

POWER
WINDOW
MAIN
SWITCH

ON

OFF

ON

OFF

PASSENGER'S
POWER WINDOW
SWITCH UPPER 
SID

e

AJ

AC106705

LOWER SIDE 

POWER
WINDOW
MOTOR

POWER
WINDOW
MAIN
SWITCH

ON

OFF

ON

OFF

AK

PASSENGER'S
POWER WINDOW
SWITCH LOWER 
SIDE

AC106705

ON

OFF

ON

OFF

UPPER SIDE

 

POWER
WINDOW
MOTOR

PASSENGER'S
POWER 
WINDOW
SUB SWITCH

UPPER SIDE

AL

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-178

Lowers the passenger’s power window
When the power window sub switch is pushed down, the sys-
tem energizes its respective power window motor, and then the 
passenger’s window glass lowers.

Power window timer function
Even after the ignition is switched off, the ETACS-ECU keeps 
the power window relay activated for approximately 30 sec-
onds, enabling raising and lowering of the power windows by 
using the power window switches. After approximately 30 sec-
onds, the power window relay is deactivated.
During this timed operation, if the driver or passenger doors are 
opened, the power window relay is deactivated from that 
moment.

General circuit diagram for the power windows

AC106705

LOWER SIDE

 

POWER
WINDOW
MOTOR

PASSENGER'S
POWER 
WINDOW
SUB SWITCH

LOWER SIDE

ON

OFF

ON

OFF

AM

AC200337 AC

ON

OFF

ON

OFF

ON 

(Open)

OFF 

(Closed)

IGNITION SWITCH (IG1)

POWER WINDOW 
RELAY

DRIVER'S OR FRONT 
PASSENGER'S
SEAT DOOR
SWITCH

t

t: 30 seconds

t