Mitsubishi Montero (2004+). Manual - part 708

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-89

STEP 2. Use scan tool MB991958 to select "ECU COMM 
CHK" on the SWS monitor display.

Check the following ECUs:

• ETACS-ECU

• RV meter

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) Connect SWS monitor kit MB991862 to the data link 

connector (13-pin).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) 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."

(5) Scan tool MB991958 should show "OK" on the "ECU 

COMM CHK" menus for both the "ETACS ECU" and the 
"CENTER DISP." menus.

Q: Is "OK" displayed on both the "ETACS ECU" and 

"CENTER DISP." menu?
"OK" are displayed for all the items : Go to Step 3.
"NG" is displayed on the "ETACS ECU" menu : Refer to 

Inspection Procedure A-3 "Communication with 
ETACS-ECU is not possible 

P.54B-42

."

"NG" is displayed on the "CENTER DISP." menu : Refer 

to Inspection procedure A-6 "Communication with RV 
meter is not possible 

P.54B-69

."

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-90

STEP 3. Check the input signal by using "FUNCTION 
DIAG." menu of the SWS monitor.

Turn the ignition switch to the "ON" position to check the input 
signals from the following switches.
Operate scan tool MB991958 according to the procedure below 
to display "CENTR. DIS. ALM."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "BUZZER."
6. Select "CENTR. DIS. ALM."

When the RV meter display switch is operated, check that nor-
mal conditions are displayed on the items described in the table 
below.

Q: Are normal conditions displayed on the "BUZZER" and 

"beep data"?
Normal conditions are displayed for all the items : 

Replace the ETACS-ECU. Verify that the RV meter 
operating sound function works normally.

The scan tool does not show the respective normal 
condition for item "BUZZER." : Replace the ETACS-ECU. 

Verify that the RV meter operating sound function 
works normally.

The scan tool does not show the respective normal 
condition for item "beep data." : Refer to Inspection 

Procedure O-10 "ETACS-ECU does not receive 
signals from any control switches 

P.54B-542

."

ITEM NO.

ITEM NAME

NORMAL 
CONDITION

ITEM 43

BUZZER

ON

ITEM 60

beep data

ON (2 kHz)

AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-91

CENTRAL DOOR LOCKING SYSTEM

GENERAL DESCRIPTION CONCERNING THE CENTRAL DOOR LOCKING SYSTEM

M1549021100088

The following ECUs affect the functions and control 
of the central door locking system.

Door lock function

.

Operating the driver’s or front passenger’s door lock key 
cylinder
When you insert the ignition key to the driver’s or front passen-
ger’s door lock key cylinder and turn the key clockwise to lock 
the door, the ETACS-ECU energizes its door lock relay for 0.5 
second to activate all the door lock actuators. Then all the 
doors will be locked.

.

FUNCTION

CONTROL ECU

Door lock function

Operating the driver’s or front passenger’s door lock key 
cylinder

ETACS-ECU

Operating the driver’s or front passenger’s door lock switch
Operating the driver’s door inside lock knob

Door unlock function

Operating the driver’s door lock key cylinder
Operating the front passenger’s door lock key cylinder 
Operating the driver’s or front passenger’s door lock switch

Forgotten key prevention function

AC203730AB

ON 

(LOCK)

OFF 

DRIVER'S OR 
PASSENGER'S
DOOR LOCK 
KEY CYLINDER 
SWITCH

0.5 second

OFF

ON

LOCK RELAY 
OUTPUT

ALL DOOR'S 
LOCK 
ACTUATOR 

UNLOCK

LOCK

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-92

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

.

Operating the driver’s door inside lock knob
When the door is locked by driver's door inside lock knob, the 
ETACS-ECU energizes its door lock relay for 0.5 second to 
activate all the door lock actuators. Then all the doors will be 
locked.

Door unlock function

.

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

.

AC203009

ON(LOCK)

ON(UNLOCK)

OFF 

t: 0.5 second

OFF

ON

DRIVER'S OR
FRONT 
PASSENGER'S
DOOR LOCK 
SWITCH

LOCK RELAY
OUTPUT

ALL DOOR'S 
LOCK ACTUATOR

UNLOCK

LOCK

AC

t

AC202980AC

UNLOCK

LOCK 

t: 0.5 second

OFF

ON

UNLOCK

LOCK

t

DRIVER'S DOOR
INSIDE LOCK KNOB

LOCK RELAY OUTPUT

ALL DOOR'S LOCK
ACTUATOR

AC200017AD

ON 

(UNLOCK)

OFF 

DRIVER'S
DOOR LOCK 
KEY CYLINDER 
SWITCH

t: 0.5 second

BACK DOOR 
LOCK 
ACTUATOR 

OFF

ON

UNLOCK RELAY 
OUTPUT

LOCK

UNLOCK

LOCK

UNLOCK

DRIVER'S 
DOOR LOCK 
ACTUATOR 

UNLOCK

LOCK

t

PASSESNGER'S 
DOOR LOCK 
ACTUATOR

t