Mitsubishi Montero (2004+). Manual — part 750

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-257

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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 (incorpo-
rated 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

• 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 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.54B-231

."

AC205138

CONNECTOR: A-08X

AB

BATTERY

FRONT-ECU

A-08X

AC205145AB

CONNECTOR: A-33

A-33

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-258

STEP 2. Use scan tool MB991958 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 MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect
the DLC harness before connecting the column-ECU har-
ness. Be sure to connect SWS monitor kit MB991862 after
turning on 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) Turn the ignition switch to the "ON" position.
(4) 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".

(5) Scan tool MB991958 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 possible

P.54B-35

."

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

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

P.54B-48

."

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-259

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 MB991958 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"?
Normal conditions displayed for all the items : Go to

Step 4.

The scan tool does not show the respective normal
condition for item "FRONT WASH. SW" : Replace the

column switch. Verify that the windshield washer
works normally.

The scan tool does not show the respective normal
condition for item "FRONT ECU ACK" : Replace the

front-ECU. Verify that the windshield washer works
normally.

STEP 4. Check windshield washer motor connector A-33
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is windshield washer motor connector A-33 in good

condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. 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

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

AC205145AE

CONNECTOR: A-33

HARNESS SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-260

STEP 5. 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 6.
NO : Replace the windshield washer motor. Verify that the

windshield washer works normally.

STEP 6. 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 7.

AC205145AE

CONNECTOR: A-33

HARNESS SIDE

AC309228AB

AC205145AE

CONNECTOR: A-33

HARNESS SIDE

AC209364KQ

CONNECTOR A-33
(HARNESS SIDE)