Mitsubishi Evolution X. Manual - part 498

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CIRCUIT OPERATION

When you operate each power window switch for 
front or rear passengers (incorporated in the power 
window main switch), the corresponding power win-
dow motor operates, opening or closing each power 
window.

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TECHNICAL DESCRIPTION (COMMENT)

If the corresponding power window opens and closes 
normally when each power window sub-switch is 
operated, the power window main switch may be 
defective.

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TROUBLESHOOTING HINT

• The power window main switch may be defective

• The front power window sub switch may be 

defective

• The rear power window sub switches may be 

defective

• The ETACS-ECU 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 (Vehicles with 

CAN communication system)

STEP 1. Check the power window main switch.
Check that the driver's power window works by means of the 
power window main switch.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Refer to inspection procedure 2 "Driver's power 

window does not work by means of the power window 
main switch 

P.42A-75

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AC708950AS

Connector: C-128

 

AC708972AU

Connector: C-315

ETACS-ECU

AC608167AM

Connector: E-15

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STEP 2. Check the power window sub switch.
Check that each power window works by means of the respec-
tive power window sub switch when the power window lock 
switch is turned off.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Refer to inspection procedure 3 "Relevant power 

window(s) does not work by means of the front and 
rear passenger's power window sub switches 

P.42A-78

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STEP 3. Check the power supply system.
With the ignition switch in the LOCK (OFF) position, check if 
the following function operates normally:

• Hazard warning light

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Refer to GROUP 54A 

− Malfunction of ETACS-ECU 

power supply circuit 

P.54A-636

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STEP 4. 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

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(2) Turn the ignition switch to the "ON" position.
(3) Check whether the ETACS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU. Refer to GROUP 54B, 

Diagnostic trouble code chart 

P.54B-5

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NO :  Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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STEP 5. Check power window main switch connector E-15 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is power window main switch connector E-15 in good 

condition?
YES : Go to Step 6.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. When the power window main switch is 

operated, the front and/or rear passenger's power 
windows should raise and lower normally.

STEP 6. Check the ETACS-ECU connector C-315 line 
circuit to the power window main switch. Measure the 
voltage at power window main switch connector E-15.
(1) Disconnect power window main switch connector E-15 and 

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

(2) Measure the voltage between terminal 4 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 9.
NO :  Go to Step 7.

STEP 7. Check ETACS-ECU connector C-315 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-315 in good condition?

YES : Go to Step 8.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. When the When the power window main 

switch is operated, the front and/or rear passenger's 
power windows should raise and lower normally.

AC208730 BS

Connector E-15
(harness side)

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STEP 8. Check the wiring harness between ETACS-ECU 
connector C-315 (terminal No. 8) and power window main 
switch connector E-15 (terminal No. 4).
NOTE: Also check  intermediate connector C-128. If intermedi-
ate connector C-128 is damaged, repair or replace the dam-
aged component(s) as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

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Q: Is the wiring harness between ETACS-ECU connector 

C-315 (terminal No. 8) and power window main switch 
connector E-15 (terminal No. 4) 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. When the 
When the power window main switch is operated, the 
front and/or rear passenger's power windows should 
raise and lower normally.

STEP 9. Retest the system.
Replace the power window main switch. Check that the front 
and/or rear passenger's power windows work 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 ETACS-ECU. Check that the power window 

works normally.

INSPECTION PROCEDURE 5: The Power Window Timer Function does not work Normally.

CAUTION

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

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COMMENTS ON TROUBLE SYMPTOM

If the power window timer does not work normally, a 
malfunction of the power window main switch or 
ETACS-ECU is suspected.

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PROBABLE CAUSES

• Malfunction of the front door switch (LH)

• Malfunction of the front door switch (RH)

• Malfunction of the power window main switch

• Malfunction of ETACS-ECU

• Damaged wiring harness and connectors

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