Mitsubishi Montero (2004+). Manual — part 744

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-233

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. 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.
(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 2.
"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

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-234

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

• Windshield wiper switch: INT

Operate the scan tool according to the procedure below to dis-
play "F.WIPER INT."

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

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

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

and "FRONT ECU ACK"?
Normal conditions displayed for all the items : Go to

Step 3.

The scan tool does not show the respective normal
condition for item "INT WIPER SW" : Replace the column

switch. Verify that the windshield wiper 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 wiper works
normally.

STEP 3. Check windshield wiper motor connector B-12 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is windshield wiper motor connector B-12 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 windshield wiper works

normally.

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 05

INT WIPER 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)

AC205116 AD

CONNECTOR: B-12

B-12 (B)

(HARNESS SIDE)

B-12 (B)

1

2

3

4

5

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-235

STEP 4. Check the windshield wiper motor.
(1) Disconnect windshield wiper motor connector B-12.
(2) Connect a battery to the windshield wiper motor as shown.

Then check the windshield wiper motor operates normally
at high and low speeds.

Q: Does the windshield wiper motor operate normally?

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

windshield wiper works normally.

STEP 5. Check the ground circuit to the windshield wiper
motor. Test at windshield wiper motor connector B-12.
(1) Disconnect windshield wiper motor connector B-12 and

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

(2) Measure the resistance value between terminal 5 and

ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

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

1

2 3

4

5

1

2 3

4

5

ACX02403

B-12

AB

LOW-SPEED

HIGH-SPEED

AC205116 AD

CONNECTOR: B-12

B-12 (B)

(HARNESS SIDE)

B-12 (B)

1

2

3

4

5

1

2

3

4

5

ACX01576AB

CONNECTOR B-12
(HARNESS SIDE)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-236

STEP 6. Check the wiring harness between windshield
wiper motor connector B-12 (terminal 5) and ground.
Q: Is the wiring harness between windshield wiper motor

connector B-12 (terminal 5) and ground in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the connector

may have loose, corroded or damaged terminals, or
terminals pushed back in the connector. Repair the
wiring harness as necessary. Verify that the
windshield wiper works normally.

STEP 7. Check front-ECU connector A-08X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front-ECU connector A-08X in good condition?

YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the windshield wiper works

normally.

STEP 8. Check the ignition switch (ACC) circuit to the
front-ECU. Test at front-ECU connector A-08X.
(1) Disconnect front-ECU connector A-08X, and measure at

the relay box side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 24 and ground.

• The voltage should be approximately 12 volts (battery

positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Go to Step 10.
NO : Go to Step 9.

AC205116 AD

CONNECTOR: B-12

B-12 (B)

(HARNESS SIDE)

B-12 (B)

1

2

3

4

5

AC204183

CONNECTOR : A-08X

AC

22

23

21

26 25

27

28

31 30 29

24

RELAY BOX SIDE

A-08X

AC204183

CONNECTOR : A-08X

AC

22

23

21

26 25

27

28

31 30 29

24

RELAY BOX SIDE

A-08X

21

22

23

24

25

27 26

28

29

30

31

ACX01611AC

CONNECTOR A-08X
(RELAY BOX SIDE)