Mitsubishi Montero (2002-2004). Manual - part 364

INPUT SIGNAL CHART

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-3

<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.54Bc-31

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.54Bc-33

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.54Bc-37

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

O-7

P.54Bc-33

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.54Bc-41

RV meter

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

O-10

 

P.54Bc-46

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.54Bc-49

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

P-2

P.54Bc-53

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

P-3

P.54Bc-57

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-4

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 all the door switches.

P-4

P.54Bc-62

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

P-5

P.54Bc-75

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

P-6

P.54Bc-93

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.54Bc-119

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

P-8

P.54Bc-131

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

P-9

P.54Bc-140

Transmitter

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

P-10

P.54Bc-145

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

Ignition switch (ACC) Input Circuit

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-5

.

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

• MB991502: Scan Tool (MUT-II)

STEP 1. 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 2.

AC204173

CONNECTOR : D-208

AN

AC204174

CONNECTOR : D-222            

AE

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)

INPUT SIGNAL PROCEDURES

TSB Revision

SWS INPUT SIGNAL PROCEDURES

54Bc-6

STEP 2. 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 3.
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.

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

NOTE: Also check junction block connector D-208 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector D-208 is damaged, 
repair or replace the damaged component(s) as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between ETACS-ECU connector D-

222 (terminal 2) and ignition switch (ACC) in good 
condition?
YES : No action is necessary and testing is complete.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. 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

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

AC204173

CONNECTOR : D-208

HARNESS SIDE

AC

1

2

3

5

6

4

D-208