Mitsubishi Montero (2004+). Manual - part 818

 

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Mitsubishi Montero (2004+). Manual - part 818

 

 

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-529

STEP 2. Replace the ECU.
(1) Replace the column switch (lighting and turn-signal light 

switch).

(2) If the functions, which are described in "CIRCUIT 

OPERATION", work normally, the input signal from the 
column switch (lighting and turn-signal light switch) should 
be normal.

Q: Does the column switch (lighting and turn-signal light 

switch) send normal signal to the ECU?
YES : 
No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. If the functions, which are 

described in "CIRCUIT OPERATION", work normally, 
the input signal from the column switch (lighting and 
turn-signal light switch) should be normal.

INSPECTION PROCEDURE O-7: Column Switch: ETACS-ECU does not receive any signal from 
windshield mist wiper switch, windshield intermittent wiper switch, windshield low-speed wiper 
switch, windshield high-speed wiper switch, windshield washer switch, rear wiper switch or rear 
washer switch.

NOTE: This troubleshooting procedure requires the 
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

."

.

CIRCUIT OPERATION
The ETACS-ECU operates the following equipment 
according to signal from the column switch (wind-
shield wiper and washer switch):

• Windshield wiper and washer

• Rear wiper and washer

.

Windshield Wiper and Washer Switch Input Circuit

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-530

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the equipment, which is 
described in "CIRCUIT OPERATION", does not work 
normally.

.

TROUBLESHOOTING HINTS

• The column switch (windshield wiper and washer 

switch) may be defective

• The ETACS-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. Use scan tool MB991958 to select "ECU COMM 
CHK" on the SWS monitor display.
Check the 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 

monito

P.54B-7

.

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure 

below to display "ECU COMM CHK."

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" menu for the "COLUMN ECU" menu.

Q: Is "OK" displayed on the "COLUMN ECU" menu?

YES : Go to Step 2.
NO :  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)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-531

STEP 2. Check the windshield wiper and washer switch.
Remove the windshield wiper and washer switch. Then check 
continuity between the switch terminals.

Q: Are the windshield wiper and washer switch in good 

condition?
YES : 
Go to Step 3.
NO :  Replace the column switch. If the equipment, which 

are described in "CIRCUIT OPERATION", work 
normally, the input signal from the column switch 
(windshield wiper and washer switch) should be 
normal.

SWITCH POSITION TESTER CONNECTION SPECIFIED 

CONDITION

OFF

− 6, 5 − 6, 6 − 7, 6 − 8, 

− 9, 6 − 10, 6 − 11

Open circuit

Windshield mist 
wiper switch

− 11

Less than 2 
ohms

Windshield 
intermittent wiper 
switch

− 10

Less than 2 
ohms

Windshield 
low-speed wiper 
switch

− 9

Less than 2 
ohms

Windshield 
high-speed wiper 
switch

− 8

Less than 2 
ohms

Windshield washer 
switch

− 7

Less than 2 
ohms

Rear wiper switch

− 6

Less than 2 
ohms

Rear washer switch 5 

− 6

Less than 2 
ohms

1

6

8

11

10

9

7

5

4

3

2

AC000417

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-532

STEP 3. Check the column switch body.
Remove the turn-signal light and lighting switch and windshield 
wiper and washer switch. Then check continuity between the 
switch body terminals.

Q: Is the switch body in good condition?

YES : Go to Step 4.
NO :  Replace the column switch. If the equipment, which 

are described in "CIRCUIT OPERATION", work 
normally, the input signal from the column switch 
(windshield wiper and washer switch) should be 
normal.

STEP 4. Replace the ECU.
(1) Replace the column switch (turn-signal light and lighting 

switch).

(2) If the equipment, which are described in "CIRCUIT 

OPERATION", work normally, the input signal from the 
column switch (windshield wiper and washer switch) should 
be normal.

Q: Does the column switch (windshield wiper and washer 

switch) send a normal signal to the ECU?
YES : 
No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. If the equipment, which are 

described in "CIRCUIT OPERATION", work normally, 
the input signal from the column switch (windshield 
wiper and washer switch) should be normal.

SWITCH BODY

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Lighting switch side 

− 

Windshield wiper and 
washer switch side

− 4,

− 5,

− 6,

− 7,

− 8,

− 9,

10 

− 10,

11 

− 11

Less than 2 ohms

ACX00803

LIGHTING 
SWITCH SIDE

WINDSHIELD 
WIPER AND 
WASHER 
SWITCH SIDE

AC

 

 

 

 

 

 

 

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