Mitsubishi Montero Sport (2004+). Manual — part 448

DOOR

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BODY

42-47

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CIRCUIT OPERATION
When the driver's inside door knob is operated to the
lock side, the ETACS-ECU will output the door lock
signal for 0.5 second. If the driver's door side door
lock key cylinder is operated to the unlock side, the
ETACS-ECU will output the unlock signal for 0.5 sec-
ond.

.

TECHNICAL DESCRIPTION (COMMENT)
The front door lock actuator (LH), the door lock key
cylinder (LH), the ETACS-ECU, harness or connec-
tor may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the front door lock actuator (LH)

• Malfunction of the door lock key cylinder switch

(LH)

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connector

AC309309AK

CONNECTOR: C-39

C-39

AC004311AE

CONNECTORS: D10, D-26, D-27

D-26

D-10

D-27

JUNCTION BLOCK

(REAR)

AC004320

F-06

F-12

CONNECTORS: F-06, F-12

AC

FRONT

DOOR

(LH)

DOOR

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991529: Diagnostic Trouble Code Check Harness

• 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. Choose method of ETACS-ECU input signal check
Q: Is the ETACS-ECU input signal check performed by

scan tool MB991958 or a voltmeter?
By Scan tool MB991958 : Go to Step 2.
By a Voltmeter <The door lock actuator switch (front:
LH) check> : Go to Step 3.
By a Voltmeter <The door lock key cylinder switch (LH)
check> : Go to Step 4.

STEP 2. Check the input signal (by using the pulse check)
(by using MB991958).
Check the ETACS-ECU input signal [door lock actuator (front:
LH) or door lock key cylinder switch (LH)] by using scan tool
MB991958.

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 scan tool MB991958 to the data link connector.
(2) Operate scan tool MB991958 as follows:

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

(3) Move the driver's inside door lock knob from "LOCK" to

"UNLOCK" or vice versa.

(4) Use the driver’s door lock key cylinder to lock and unlock

the doors.

(5) Check that scan tool MB991958 sounds
Q: Does the tone alarm of scan tool MB991958 sound when

the input signal enters?
YES : Replace the ETACS-ECU and then go to Step 15.
NO <The door lock actuator (front: LH) input signal> :

Go to Step 5.

NO <The door lock key cylinder switch (LH) input
signal> : Go to Step 10.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

DOOR

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BODY

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STEP 3. Check the ETACS-ECU input signal from the door
lock actuator switch (front: LH) (by using a voltmeter).
(1) Use special tool MB991529 to connect a voltmeter between

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.

(2) Check that the voltmeter indicator deflects once when the

door lock actuator switch (front: LH) is operated
(lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 15.
NO : Go to Step 5.

STEP 4. Check the input signal from the door lock key
cylinder switch (LH) (by using a voltmeter).
(1) Use special tool MB991529 to connect a voltmeter between

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.

(2) Check that the voltmeter indicator deflects once when the

door lock key cylinder switch (LH) is operated (lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 15.
NO : Go to Step 10.

STEP 5. Check door lock actuator (front: LH) connector
F-12 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are the connectors in good condition?

YES : Go to step 6.
NO : Repair or replace the damaged components. Refer to

GROUP 00E

P.00E-2

, Harness Connector inspection.

Then go to Step 15.

7

6

5

4

3

2

1

14

13

12

11

10

9

8

16

15

AC004323

MB991529

GROUND TERMINAL

ETACS TERMINAL

AB

7

6

5

4

3

2

1

14

13

12

11

10

9

8

16

15

AC004323

MB991529

GROUND TERMINAL

ETACS TERMINAL

AB

AC309370

CONNECTOR: F-12

F-12

FRONT DOOR <LH>

AC

1

3 2

4

6 5

COMPONENT SIDE

DOOR

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STEP 6. Check the front door lock actuator switch (front:
LH).
(1) Remove the door latch assembly (Refer to

P.42-140

).

(2) Follow the table to check the resistance when the door lock

actuator switch (front: LH) is operated (lock/unlock).

Q: Is the front door lock actuator switch (front: LH)

damaged?
YES : Replace front door lock actuator assembly (front: LH),

go to Step 15.

NO : Go to Step 7.

STEP 7. Check ETACS-ECU connector D-10 <Vehicles
without keyless entry system> or D-27 <Vehicles with
keyless entry system> for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors in good condition?

YES : Go to step 8.
NO : Repair or replace the damaged components. Refer to

GROUP 00E

P.00E-2

, Harness Connector inspection.

Then go to Step 15.

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

At the LOCK
position

1

− 2

Less than 2 ohms

At the UNLOCK
position

1

− 2

Open circuit

5

6

1

2

3

4

AC004327AB

VIEW A

A

LOCK

UNLOCK

AC202002

6 5 4

1

2

7

3
8

41

43

51

42

50

44

52

46 45

53

49

47

30

48

56

55

D-27 (B)

D-10

JUNCTION
BLOCK (REAR)

CONNECTORS: D-10, D-27

AB

D-27 COMPONENT SIDE

D-10 COMPONENT SIDE

21

22

23

24

25

26

27

28