Mitsubishi Montero (2004+). Manual - part 752

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-265

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

NOTE: This troubleshooting procedure requires use 
of scan tool MB991958 and SWS monitor kit 
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor 

P.54B-10

."

Rear Wiper Drive Circuit

AC000759

CONNECTOR: D-111

AC

ACX02285

CONNECTOR: D-217

AP

JUNCTION BLOCK (FRONT VIEW)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-266

.

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• 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

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

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

SIMPLIFIED WIRING SYSTEM (SWS)

54B-267

STEP 1. Use scan tool MB991958 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 MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. 
(1) Connect the special tool. Refer to "How to connect SWS 

monitor 

P.54B-7

.

(2) Turn the ignition switch to the "ON" position.
(3) Operate scan tool MB991958 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".

(4) Scan tool MB991958 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.54B-42

."

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

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

P.54B-35

."

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-268

STEP 2. Check the input signal by using "FUNCTION 
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ACC

• Rear wiper switch: INT

Operate scan tool MB991958 according to the procedure below 
to display "REAR WIPER."

1. Select "SWS."
2. Select "SYSTEM SELECT."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "REAR WIPER."

Check that normal conditions are displayed on the items 
described in the table below.

Q: Are normal conditions displayed for "REAR WIPER SW" 

and "IG SW (ACC)"?
Normal conditions are displayed for all the items : Go to 

Step 3.

Normal condition is not displayed "REAR WIPER SW" : 

Refer to Inspection Procedure O-7 "ETACS-ECU 
does not receive a signal from the rear wiper switch 

P.54B-529

."

Normal condition is not displayed for "IG SW (ACC)" : 

Refer to Inspection Procedure O-1 "ETACS-ECU 
does not receive a signal from the ignition switch 
(ACC) 

P.54B-502

."

STEP 3. Check the rear wiper motor connector I-07 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is rear wiper motor connector I-07 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 rear wiper works normally.

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 13

REAR WIPER SW ON

ITEM 31

IG SW (ACC)

ON

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

ACX02293

CONNECTOR: I-07

AR

I-07(B)

I-07(B)

(HARNESS SIDE)

1

2

3

4