Mitsubishi Montero (2004+). Manual — part 709

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-93

Operating the front passenger’s door lock key cylinder
When you insert the ignition key to the front passenger’s door
lock key cylinder and turn the key counterclockwise to unlock
the door, the ETACS-ECU energizes its door unlock relay for
0.5 second to activate all the door lock actuators. Then all the
doors will be unlocked.

.

Operating the driver’s or front passenger’s door lock
switch
When the door is unlocked by driver’s or front passenger's door
lock switch, the ETACS-ECU energizes its door unlock relay for
0.5 second to activate all the door lock actuators. Then all the
doors will be unlocked.

.

Forgotten Key Prevention Function
If the driver's door is opened with the ignition key
inserted in the ignition key cylinder and then locked
(i.e., the unlock switch integrated in the driver's door
lock actuator is off, and the lock switch is on), the
ETACS-ECU turns on the unlock relay for 0.5 second

after approximately 0.3 second. This prevents the
door from being locked unintentionally. If the system
fails to unlock the door, the ETACS-ECU try to turn
on the unlock relay five times in maximum for 0.5
second every one second.

NOTE: The dotted line indicates that the system is
trying to turn on the unlock relay if the door can not

be unlocked.

AC203005AC

ON(UNLOCK)

OFF

ON

OFF

FRONT
PASSENGER'S
DOOR LOCK KEY
CYLINDER SWITCH

UNLOCK RELAY
OUTPUT

t: 0.5 second

t

ALL DOOR'S LOCK
ACTUATOR

UNLOCK

LOCK

AC203006AC

DRIVER'S OR
FRONT PASSENGER'S
DOOR LOCK
SWITCH

UNLOCK RELAY
OUTPUT

ON(LOCK)

ON(UNLOCK)

ON

OFF

t

t: 0.5 second

OFF

UNLOCK

LOCK

ALL DOOR'S LOCK
ACTUATOR

AC101499 AE

KEY REMINDER

SWITCH

DRIVER'S DOOR

SWITCH

DRIVER'S DOOR LOCK

ACTUATOR SWITCH

LOCK

UNLOCK

LOCK RELAY OUTPUT

UNLOCK RELAY OUTPUT

(OPEN)ON

(CLOSE)OFF

ON

OFF

ON

OFF

t : 0.3 second

T1 : 0.5 second

T2 : 1 second

(KEY REMOVED)

(KEY INSERTED)

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-94

General circuit diagram for the central door locking system

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-95

INSPECTION PROCEDURE C-1: Central Door Locking System: The central door lock system does not
work at all.

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

."

Central Door Lock Power Supply Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-96

.

CIRCUIT OPERATION

• The ETACS-ECU controls the central door lock

system, locking or unlocking all the doors by acti-
vating the central door lock relay (built into the
ETACS-ECU). The ETACS-ECU uses inputs from
the following components:

• Driver's or passenger's door lock actuator

switch

• Driver's or passenger's door lock key cylinder

switch

• Door lock switch, which is incorporated in the

power window main switch or power window
sub switch (front RH)

.

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

ACX02274

FUSIBLE LINK (2)

AF

BATTERY

FUSIBLE LINK

AC000758

CONNECTORS: D-25, D-28

AK

D-25

D-28

ACX02286

CONNECTOR: D-222

AC

JUNCTION BLOCK (REAR VIEW)

ACX02285

CONNECTORS: D-209, D-211, D-217

AK

D-211

D-209

D-217

JUNCTION BLOCK (FRONT VIEW)

AC203774

CONNECTOR: H-10

AB

DRIVER'S DOOR

H-10