Mitsubishi Montero (2004+). Manual - part 811

INPUT SIGNAL CHART

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-501

<Scan tool or voltmeter>
If a problem is found in the Pulse Check, observe the 
table below.

Column Switch ETACS-ECU does not receive any signal from the tail 

light switch.

O-6

P.54B-527

ETACS-ECU does not receive any signal from the 
headlight switch.
ETACS-ECU does not receive any signal from the 
passing light switch.
ETACS-ECU does not receive any signal from the 
dimmer switch.
ETACS-ECU does not receive any signal from the 
turn-signal light switch.
ETACS-ECU does not receive any signal from the 
windshield mist wiper switch.

O-7

P.54B-529

ETACS-ECU does not receive any signal from the 
windshield intermittent wiper switch.
ETACS-ECU does not receive any signal from the 
windshield low-speed wiper switch.
ETACS-ECU does not receive any signal from the 
windshield high-speed wiper switch.
ETACS-ECU does not receive any signal from the 
windshield intermittent wiper interval adjusting knob.

O-8

P.54B-533

ETACS-ECU does not receive any signal from the 
windshield washer switch.

O-7

P.54B-529

ETACS-ECU does not receive any signal from the rear 
wiper switch.
ETACS-ECU does not receive any signal from the rear 
washer switch.

Sunroof

ETACS-ECU does not receive any signal from the up, 
open or close/down switch.

O-9

P.54B-537

RV meter

ETACS-ECU does not receive any signal from any 
control switches.

O-10

 

P.54B-542

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

ETACS-ECU does not receive any signal from the key reminder switch. P-1

P.54B-545

ETACS-ECU does not receive any signal from the hazard warning light 
switch.

P-2

P.54B-549

ETACS-ECU does not receive any signal from the driver's seat belt 
switch.

P-3

P.54B-553

ETACS-ECU does not receive any signal from all the door switches.

P-4

P.54B-559

ETACS-ECU does not receive any signal from the driver's, front 
passenger's or back door lock key cylinder switch.

P-5

P.54B-570

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-502

INPUT SIGNAL PROCEDURES

INSPECTION PROCEDURE O-1: ETACS-ECU does not receive any signal from the ignition switch 
(ACC).

.

ETACS-ECU does not receive any signal from the driver's, front 
passenger's, rear or back door lock actuator switch.

P-6

P.54B-587

ETACS-ECU does not receive any signal from the door lock switch 
(incorporated in the power window main switch and power window sub 
switch).

P-7

P.54B-603

ETACS-ECU does not receive an auto-stop signal from the rear wiper 
motor.

P-8

P.54B-615

ETACS-ECU does not receive any signal from hood switch.

P-9

P.54B-622

Transmitter

ETACS-ECU does not receive any signal from the 
lock, unlock switch or panic switch.

P-10

P.54B-626

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

Ignition switch (ACC) Input Circuit

AC204173

CONNECTOR : D-208

AN

AC204174

CONNECTOR : D-222            

AE

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-503

CIRCUIT OPERATION
The ETACS-ECU operates the following equipment 
according to signal from the ignition switch (ACC):

• Windshield wiper and washer

• Rear wiper and washer

.

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

.

TROUBLESHOOTING HINTS

• 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

STEP 1. Check ETACS-ECU connector D-222 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector D-222 in good condition?

YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the equipment, which are described in 

"CIRCUIT OPERATION", work normally, the input 
signal from the ignition switch (ACC) should be 
normal.

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-504

STEP 2. Check the ignition switch (ACC) circuit to the 
ETACS-ECU. Test at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222 and measure the 

voltage available at the junction block side of the connector.

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

(3) Measure the voltage between terminal 2 and ground.

• The voltage should equal approximately 12 volts (bat-

tery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Replace the ETACS-ECU. If the equipment, which 

are described in "CIRCUIT OPERATION", work 
normally, the input signal from the ignition switch 
(ACC) should be normal.

NO :  Go to Step 3.

STEP 3. Check the wiring harness between ETACS-ECU 
connector D-222 (terminal 2) and the ignition switch (ACC).

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

ACX01593

19

20

1817 1615 141312 1110 9 8 7

6 5 4 3 2 1

AB

CONNECTOR D-222
(JUNCTION BLOCK SIDE)

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222