Mitsubishi Evolution X. Manual - part 493

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42A-75

INSPECTION PROCEDURE 2: Driver's Power Window does not work by means of The Power Window 
Main Switch.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal.

.

CIRCUIT OPERATION

The front power window motor (LH) receives a signal 
("UP", "DOWN", "AUTO UP" or "AUTO DOWN") from 
the front power window main switch and controls the 
driver’s power window.

.

TECHNICAL DESCRIPTION (COMMENT)

The power window main switch or the front power 
window motor (LH) may be defective.

.

AC609756

FRONT

POWER

WINDOW

MOTOR (LH)

FRONT 

(LH)

CPU

IC

IC

LIN DRIVE 

CIRCUIT

POWER WINDOW MAIN SWITCH

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLUE

BLUE

ORANGE

LIGHT  GREEN

GREEN

VIOLET

AC

Driver's Side Power Window Circuit

AC608167AO

Connectors: E-14, E-15

E-15

E-14 (GR)

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TROUBLESHOOTING HINTS

• The power window main switch may be defective

• The front power window motor (LH) may be 

defective

• The wiring harness or connectors may have 

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

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code.

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 scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.42B-10

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the power window main switch related DTC 

is set.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the power window main switch. Refer to 

Diagnostic trouble code chart 

P.42A-58

.

NO :  Go to Step 2.

STEP 2. Check the power window main switch.
Check that the passenger's or rear power window works by 
means of the power window main switch.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Refer to inspection procedure 1 "Power windows do 

not work at all 

P.42A-58

."

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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STEP 3. Check power window main switch connector E-15, 
front power window motor (LH) connector E-14 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Are power window main switch connector E-15, front 

power window motor (LH) connector E-14 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

. Verify that the power window works 

normally.

STEP 4. Check the wiring harness between power window 
main switch connector E-15 (terminals Nos. 2 and 6) and 
front power window motor (LH) connector E-14 (terminals 
Nos. 4 and 1). 
Q: Is the wiring harness between power window main 

switch connector E-15 (terminals Nos. 2 and 6) and front 
power window motor (LH) connector E-14 (terminals 
Nos. 4 and 1) in good condition?
YES : Go to Step 5.
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. Check that 
the power works normally.

STEP 5. Retest the system.
Check that the driver's power window works by means of the 
power window main switch.
Q: Is the check result normal?

YES : No action is necessary and testing is complete.
NO :  Replace the front power window motor (LH). Check 

that the power works normally.

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INSPECTION PROCEDURE 3: Relevant Power Window(s) does not work by means of The Front and 
Rear Passenger's Power Window Sub Switches.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal.

AC609758

ETACS-ECU

POWER
WINDOW
RELAY

AC

Power window (Front Passenger's side) Circuit

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLA

CK

BLA

CK

RED

RED

RED

GREEN

BR

O

W

N

GREEN

BR

O

W

N

B

R

O

WN

GREEN

FRONT 
(RH)

LOCK
SWITCH

POWER 
WINDOW 
MAIN SWITCH

VIOLET

BLUE

FRONT
POWER
WINDOW
SUB
SWITCH

FRONT
POWER
WINDOW
MOTOR (RH)