Mitsubishi Montero (2002-2004). Manual - part 303

 

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Mitsubishi Montero (2002-2004). Manual - part 303

 

 

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-259

.

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

.

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

.

TROUBLESHOOTING HINTS

• The windshield washer 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. Verify the windshield wiper.
Q: Does the windshield wiper operate normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure G-1 "Windshield wiper 

does not work at all 

P.54Bb-231

."

AC205138

CONNECTOR: A-08X

AB

BATTERY

FRONT-ECU

A-08X

AC205145AB

CONNECTOR: A-33

A-33

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-260

STEP 2. Use scan tool MB991502 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the following ECUs:

• Column-ECU

• Front-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. Connect 
the DLC harness before connecting the column-ECU har-
ness. Be sure to connect SWS monitor kit MB991862 after 
turning on 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 
"FRONT ECU" menus.

Q: Is "OK" displayed on the "COLUMN ECU" and "FRONT 

ECU" menu?
"OK" is displayed for all the items : 
Go to Step 3.
"NG" is displayed on the "COLUMN ECU" menu : Refer 

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

P.54Bb-

16

."

"NG" is displayed on the "FRONT ECU" menu : Refer to 

Inspection procedure A-4 "Communication with front-
ECU is not possible 

P.54Bb-32

."

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-261

STEP 3. Check the input signal by using "FUNCTION 
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON

• Windshield washer switch: ON

Operate scan tool MB991502 according to the procedure below 
to display "F.WIPER WASH."

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

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

Q: Are normal conditions displayed for "FRONT 

WASH.SW" and "FRONT ECU ACK"?
YES : 
Go to Step 4.
NO : 

• Normal condition is not displayed on the "FRONT 

WASH. SW." Replace the column switch. Verify 
that the windshield washer works normally.

• Normal condition is not displayed on the "FRONT 

ECU SW." Replace the front-ECU. Verify that the 
windshield washer works normally.

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 09

FRONT 
WASH.SW

ON

ITEM 70

FRONT ECU ACK NORMAL ACK or 

HI-BEAM ACK

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-262

STEP 4. Check the windshield washer motor.
(1) Disconnect windshield washer motor connector A-33, and 

check at windshield washer motor connector side.

(2) Fill the windshield washer tank with washer fluid.

(3) Connect windshield washer motor connector terminal 1 to 

the positive battery terminal, and terminal 2 to the negative 
battery terminal, respectively. Washer fluid should spray 
out.

Q: Does the windshield washer motor operate normally?

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

windshield washer works normally.

STEP 5. Check the ground circuit to the windshield washer 
motor. Test at connector A-33. 
(1) Disconnect windshield washer motor connector A-33 and 

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

(2) Measure the resistance value between terminal 2 and 

ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 8.
NO :  Go to Step 6.

AC205145 AC

CONNECTOR: A-33

A-33

A-33

1

2

ACX00449

AC205145 AC

CONNECTOR: A-33

A-33

A-33

AC204323 AH

CONNECTOR A-33
(HARNESS SIDE)

 

 

 

 

 

 

 

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