Mitsubishi Montero Sport (2004+). Manual - part 462

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INSPECTION PROCEDURE 2: All Windows does not Open or Close Using the Power Window 
Main/Sub Switch <Vehicles with keyless entry system>.

Power Window Switch Circuit

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CIRCUIT OPERATION
The ETACS-ECU turns ON the power window relay 
when the ignition switch (IG1) is turned ON.

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TECHNICAL DESCRIPTION (COMMENT)
The power window relay or the ETACS-ECU may be 
defective.

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TROUBLESHOOTING HINTS

• Malfunction of the power window relay

• Malfunction of the ETACS-ECU

• Malfunction of the power window main switch 

• Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991529: Diagnostic Trouble Code Check Harness

• MB991958: Scan Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Choose method of ETACS-ECU input signal 
check.
Q: Is the ETACS-ECU input signal check performed by 

scan tool MB991958 or a voltmeter?
By Scan tool MB991958 : Go to Step 2.
By a Voltmeter  : Go to Step 3.

AC309309AD

C-40

CONNECTORS: C-40, C-41

C-41

AC003622

CONNECTOR: C-75X

AE

C-75X

AC004311

D-08

D-11

JUNCTION BLOCK

(REAR)

CONNECTORS: D-08, D-11, D-26

BI

D-26 (B)

AC004320

FRONT

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(LH)

CONNECTOR: F-05

AE

F-05

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STEP 2. Check the ETACS-ECU input signal from the 
ignition switch (by using the pulse check) (by using 
MB991958).
Check the ETACS-ECU input signal ignition switch (IG1) by 
using scan tool MB991958.

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 to the data link connector.
(2) Operate scan tool MB991958 as follows:

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

(3) Turn the ignition switch (IG1) to ''ON'' position.
(4) Check that scan tool MB991958 sounds
Q: Does the tone alarm of scan tool MB991958 sound when 

the input signal enters?
YES : Replace the ETACS-ECU and then go to Step 7.
NO :  Go to Step 4.

STEP 3. Check the ETACS-ECU input signal from the 
ignition switch (by using a voltmeter).
(1) Use special tool MB991529 to connect a voltmeter between 

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the 
data link connector.

(2) Check that the voltmeter indicator deflects once when the 

ignition switch (IG1) is turned to ''ON'' position.

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 7.
NO :  Go to Step 4.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

7

6

5

4

3

2

1

14

13

12

11

10

9

8

16

15

AC004323

MB991529

GROUND TERMINAL

ETACS TERMINAL

AB

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STEP 4. Check ETACS-ECU connector D-11 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E 

P.00E-2

, Harness Connector inspection. 

Then go to Step 21.

STEP 5. Measure the ETACS-ECU power supply circuit 
ignition switch (IG1) at ETACS- ECU connector D-11.
(1) Remove the ETACS-ECU, and measure at ETACS-ECU 

connector D-11 (junction block side).

(2) Measure the voltage between terminal 3 and ground.
Q: Is the measured voltage approximately 12 volts (battery 

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

AC201084

JUNCTION 
BLOCK (REAR)

D-11

COMPONENT SIDE

AB

CONNECTOR: D-11

AC201084

JUNCTION 
BLOCK (REAR)

D-11

COMPONENT SIDE

AB

CONNECTOR: D-11

12 1110 9 8 7 6 5 4

3 2 1

AC005048

D-11 HARNESS CONNECTOR:
COMPONENT SIDE

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