Mitsubishi Montero (2004+). Manual - part 755

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-277

INSPECTION PROCEDURE H-4: Rear Wiper and Washer: Rear washer does not operate.

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 Washer Drive Circuit

AC000759

CONNECTOR: D-111

AC

ACX02285

CONNECTOR: D-221

AU

JUNCTION BLOCK (FRONT VIEW)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-278

.

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

.

TECHNICAL DESCRIPTION (COMMENT)
If the rear washer does not work normally, the rear 
washer motor, the column switch (windshield wiper 
and washer switch) or the front-ECU may be defec-
tive.

.

TROUBLESHOOTING HINTS

• The rear washer motor may be defective

• The column switch (windshield wiper and washer 

switch) may be defective

• The ETACS-ECU may be defective 

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

STEP 1. Verify the rear wiper operation.
Q: Does the rear wiper operate normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure H-1 "Rear wiper does 

not work at all 

P.54B-265

."

ACX02286

CONNECTOR: D-222

AC

JUNCTION BLOCK (REAR VIEW)

ACX02290

CONNECTOR: G-10

AB

ACX02293

CONNECTOR: I-08

AE

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-279

STEP 2. Check the input signal by using "FUNCTION 
DIAG." menu of the SWS monitor.
Set each switch to the following condition before checking input 
signals from the rear washer switch:

• Ignition switch: ACC

• Rear washer switch: ON

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) Connect SWS monitor kit MB991862 to the data link 

connector (13-pin).

(3) Operate scan tool MB991958 according to the procedure 

below to display "REAR WASHER."

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

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

described in the table below.

Q: Are normal conditions displayed?

YES : Go to Step 3.
NO :  Refer to Inspection Procedure O-7 "ETACS-ECU 

does not receive a signal from the rear washer switch 

P.54B-529

."

STEP 3. Check rear washer motor connector I-08 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is rear washer motor connector I-08 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 washer works normally.

ITEM NO. ITEM NAME

NORMAL CONDITION

ITEM 14

REAR WASH.SW ON

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

ACX02293 AT

CONNECTOR: I-08

I-08 (B)

2

1

(HARNESS SIDE)

I-08 (B)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-280

STEP 4. Check the rear washer motor.
(1) Disconnect rear washer motor connector I-08.
(2) Fill the washer tank with washer fluid.

(3) Connect rear washer motor connector terminal 2 to the 

positive battery terminal, and terminal 1 to the negative 
battery terminal, respectively. Washer fluid should spray 
out.

Q: Does the rear washer motor operate normally?

YES : Go to Step 5.
NO :  Replace the rear washer motor. Verify that the rear 

washer works normally.

STEP 5. Check the ground circuit to the rear washer motor. 
Test at rear washer motor connector I-08.
(1) Disconnect rear washer motor connector I-08 and measure 

the resistance available at the wiring harness side of the 
connector.

(2) Measure the resistance value between terminal 1 and 

ground.

• The resistance should equal 2 ohm or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.
NO :  Go to Step 6.

ACX02293 AT

CONNECTOR: I-08

I-08 (B)

2

1

(HARNESS SIDE)

I-08 (B)

1

2

ACX00455

ACX02293 AT

CONNECTOR: I-08

I-08 (B)

2

1

(HARNESS SIDE)

I-08 (B)

AC200953

2

1

AD

CONNECTOR I-08
(HARNESS SIDE)