Mitsubishi Montero (2002-2004). Manual - part 305

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-267

General circuit diagram for the rear wiper and washer 

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-268

INSPECTION PROCEDURE H-1: Rear Wiper and Washer: Rear wiper does not work at all.

NOTE: This troubleshooting procedure requires 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

."

Rear Wiper Drive Circuit

AC000759

CONNECTOR: D-111

AC

ACX02285

CONNECTOR: D-217

AP

JUNCTION BLOCK (FRONT VIEW)

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-269

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CIRCUIT OPERATION

• The rear wiper switch sends a signal through the 

column-ECU (incorporated in the column switch) 
to the ETACS-ECU. If the column-ECU sends a 
rear wiper switch "ON" signal to the ETACS-ECU, 
the ETACS-ECU turns on the relay (incorporated 
in the ETACS-ECU), thus causing the rear wiper 
motor to be turned on.

• The ETACS-ECU operates the rear wiper accord-

ing to the following switches:

• Ignition switch (ACC)

• Rear wiper switch

.

TECHNICAL DESCRIPTION (COMMENT)
If the rear wiper does not work normally, the input cir-
cuit system from the switches, the rear wiper motor, 
the column switch (windshield wiper and windshield 
washer switch) or the ETACS-ECU may be defective 
(refer to "CIRCUIT OPERATION").

.

TROUBLESHOOTING HINTS

• The rear wiper motor may be defective

• The column switch may be defective (windshield 

wiper and washer switch)

• The ETACS-ECU may be defective

• The wiring harness may be damaged or the con-

nectors may have loose, corroded or damaged 
terminals, pushed back in the connector

ACX02286

CONNECTOR: D-222

AC

JUNCTION BLOCK (REAR VIEW)

AC204524

CONNECTOR: G-10

AB

G-10

ACX02293

CONNECTOR: I-07

AP

I-07(B)

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-270

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991223: Scan Tool (MUT-II) 

• MB991223: SWS Monitor Kit

STEP 1. Use scan tool MB991502 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the following ECUs:

• ETACS-ECU

• Column-ECU

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) Turn the ignition switch to the "ON" position.
(4) Operate scan tool MB991502 according to the procedure 

below to display "ECU COMM CHECK."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK".

(5) Scan tool MB991502 should show "OK" on the "ECU 

COMM CHK" menus for both the "COLUMN ECU", and the 
"ETACS ECU" menus.

Q: Is "OK" displayed on both the "ETACS ECU" and 

"COLUMN ECU" menus?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed on the "ETACS ECU" menu : Refer to 

Inspection Procedure A-3 "Communication with 
ETACS-ECU is not possible 

P.54Bb-25

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"NG" is displayed on the "COLUMN ECU" menu : Refer 

to Inspection Procedure A-2 "Communication with 
column switch (column-ECU) is not possible 

P.54Bb-

16

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AC204222AB

16-pin

13-pin

MB991502

MB991862