Mitsubishi Montero (2002-2004). Manual - part 299

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-243

INSPECTION PROCEDURE G-3: Windshield Wiper and Washer: Any of the windshield wiper switch 
positions is defective.

NOTE: This troubleshooting procedure requires the 
use of scan tool MB991502 and SWS monitor kit 
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor 

P.54Ba-8

."

.

Windshield Wiper Motor Drive Circuit

AC205142AB

CONNECTOR: A-05

A-05(B)

AC205138

CONNECTOR: A-08X

AB

BATTERY

FRONT-ECU

A-08X

AC205116 AB

CONNECTOR: B-12

B-12 (B)

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-244

TECHNICAL DESCRIPTION (COMMENT)
If either of the windshield wiper switch positions is 
defective, the windshield wiper motor, column switch 
(windshield wiper and washer switch) or the front-
ECU may be defective.

.

TROUBLESHOOTING HINTS

• The windshield wiper motor may be defective

• The column switch (windshield wiper and washer 

switch) may be defective

• The front-ECU may be defective

• The wiring harness or connectors may have 

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

• MB991862: SWS Monitor Kit

STEP 1. Check the input signal by using "DATA LIST" 
menu of the SWS monitor.
Turn the ignition switch to the ACC position before checking 
input signals from the windshield wiper switch.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502. 
(1) Connect scan tool MB991502 to the data link connector 

(16-pin).

(2) Connect SWS monitor kit MB991862 to the data link 

connector (13-pin).

(3) Operate scan tool MB991502 according to the procedure 

below to display "COLUMN ECU."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "COLUMN ECU."

(4) Check that normal conditions are displayed on the items 

described in the table below.

Q: Are normal conditions displayed for "INT WIPER SW", 

"LO WIPER SW", "HI WIPER SW" and "MIST WIPER 
SW"?
YES : Go to Step 2.
NO :  Refer to Inspection Procedure O-7 "ETACS-ECU 

does not receive a signal from the windshield mist 
wiper switch 

P.54Bc-31

."

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 05

INT WIPER SW

ON

ITEM 06

LO WIPER SW

ON

ITEM 07

HI WIPER SW

ON

ITEM 08

MIST WIPER SW

ON

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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STEP 2. Check the windshield wiper motor.
(1) Disconnect windshield wiper motor connector B-12.

(2) Connect a battery to the windshield wiper motor as shown. 

Then check the windshield wiper motor operates normally 
at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 3.
NO :  Replace the windshield wiper motor. Verify that the 

windshield wiper operates normally when the 
windshield wiper switch is moved to each position.

AC205116 AC

CONNECTOR: B-12

B-12 (B)

B-12 (B)

1

2 3

4

5

1

2 3

4

5

ACX02403

B-12

AB

LOW-SPEED

HIGH-SPEED

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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STEP 3. Check windshield wiper motor connector B-12 and 
front-ECU connector A-08X for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are windshield wiper motor connector B-12 and front-

ECU connector A-08X 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 windshield wiper operates 

normally when the windshield wiper switch is moved 
to each position.

AC205138

CONNECTOR: A-08X

AC

BATTERY

FRONT-ECU

A-08X

A-08X

AC205116 AC

CONNECTOR: B-12

B-12 (B)

B-12 (B)