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

monitor

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

4

− 6, 5 − 6, 6 − 7, 6 − 8,

6

− 9, 6 − 10, 6 − 11

Open circuit

Windshield mist
wiper switch

6

− 11

Less than 2
ohms

Windshield
intermittent wiper
switch

6

− 10

Less than 2
ohms

Windshield
low-speed wiper
switch

6

− 9

Less than 2
ohms

Windshield
high-speed wiper
switch

6

− 8

Less than 2
ohms

Windshield washer
switch

6

− 7

Less than 2
ohms

Rear wiper switch

4

− 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

− 4,

5

− 5,

6

− 6,

7

− 7,

8

− 8,

9

− 9,

10

− 10,

11

− 11

Less than 2 ohms

ACX00803

LIGHTING
SWITCH SIDE

WINDSHIELD
WIPER AND
WASHER
SWITCH SIDE

AC