Mitsubishi Montero (2004+). Manual - part 736

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-201

DIAGNOSIS

Check that power window sub-switches operate normally.
Q: A power window can not work by means of the power 

window main switch. Can you operate the power 
window by means of the corresponding power window 
sub-switch?
YES : Replace the power window main switch. The power 

window main switch is operated, the front 
passenger’s or rear power window function should 
now work normally.

NO :  Refer to Inspection Procedure D-4 "Power windows 

do not work normally by operating the passenger’s 
and rear power window switches 

P.54B-165

."

KEYLESS ENTRY SYSTEM

GENERAL DESCRIPTION CONCERNING THE KEYLESS ENTRY SYSTEM

M1549022000170

The following ECUs affect the functions and control 
of the keyless entry system.

All door lock function

.

Operate the transmitter lock switch
When the transmitter lock switch is pressed, the ETACS-ECU 
energizes its door lock relay to operate all the door lock actua-
tors for 0.5 second thus causing all doors to be locked. 

FUNCTION

CONTROL 
ECU

All door lock function

Operate the transmitter lock switch

ETACS-ECU

Driver’s door unlock function

Press the transmitter unlock switch once

All door unlock function

Press the transmitter unlock switch twice

Keyless entry hazard answerback and horn answerback function

AC203059AC

ON(LOCK)

OFF

TRANSMITTER
LOCK SWITCH

t: 0.5 second

OFF

ON

DOOR LOCK RELAY 
OUTPUT

ALL DOOR'S 
LOCK ACTUATOR 

UNLOCK

LOCK

t

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-202

Driver’s door unlock function

.

Press the transmitter unlock switch once
When the transmitter unlock switch is pressed once, the 
ETACS-ECU energizes its door unlock relay to operate the 
door lock actuator of the driver’s door for 0.5 second thus caus-
ing only the driver’s door to be unlocked.

All door unlock function

.

Press the transmitter unlock switch twice
When the transmitter unlock switch is pressed twice, the 
ETACS-ECU energizes its door unlock relay to operate the 
driver’s door lock actuator and the other door lock actuators for 
0.5 second each in succession. Then, the doors will be 
unlocked.

AC203063AC

ON

(UNLOCK)

OFF

TRANSMITTER
UNLOCK 
SWITCH

t: 0.5 second

OFF

ON

DOOR UNLOCK RELAY 
OUTPUT

DRIVER'S DOOR 
LOCK ACTUATOR 

UNLOCK

LOCK

t

AC203065 AC

ON

(UNLOCK)

OFF

TRANSMITTER
UNLOCK SWITCH

t: 0.5 second

OFF

ON

DOOR UNLOCK 
RELAY OUTPUT

LOCK

UNLOCK

LOCK

UNLOCK

DRIVER'S DOOR 
LOCK ACTUATOR 

t

PASSESNGER'S 
DOOR LOCK 
ACTUATORS

t

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-203

Keyless entry hazard answerback and horn 
answerback function

The hazard answerback and horn answerback function which 
facilities checking of lock or unlock operations even during day-
time is provided. When the lock signal is input from the keyless 
entry transmitter to the ETACS-ECU, the hazard light flashes 
twice and horn sounds once. When the unlock signal is input, 
hazard light flashes once.
NOTE: Hazard answerback function can be disabled by the 
configuration function (Refer to GROUP 54B 

P.54B-635

.)

AC203077AB

LOCK

OFF

UNLOCK

ON

OFF

ON

OFF

Illuminated

Not illuminated

KEYLESS ENTRY
TRANSMITTER 
SWITCH

LOCK RELAY 
OUTPUT

UNLOCK RELAY 
OUTPUT

HAZARD LIGHT 
FLASHING 
STATE

HORN RELAY 
OUTPUT

ON

OFF

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-204

General circuit diagram for the keyless entry system