Mitsubishi Montero Sport (2004+). Manual — part 444

DOOR

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BODY

42-31

Door Lock Switch Circuit

AC309371

<Vehicles with keyless entry system>

AC309353AB

C-12

CONNECTOR: C-12

AC309309AI

C-40

CONNECTORS: C-39, C-40

C-39

DOOR

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.

CIRCUIT OPERATION
When the front power window switch (incorporated
with door lock switch) or door lock key cylinder
switch (RH) is locked or unlocked, the ETACS-ECU
will lock or unlock the door lock actuator.

.

TECHNICAL DESCRIPTION (COMMENT)
The front power window switch (incorporated with
door lock switch), the door lock key cylinder switch
(RH), the ETACS-ECU, harness or connector may be
defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the front power window switch

• Malfunction of the door lock key cylinder switch

(RH)

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connector

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

AC004311AZ

CONNECTORS: D10, D-26, D-27

D-26 (B)

D-10

D-27 (B)

JUNCTION BLOCK

(REAR)

AC004321

CONNECTORS: F-17, F-18

AE

F-17

F-18

FRONT

DOOR

(RH)

AC004320

FRONT

DOOR

(LH)

CONNECTOR: F-05

AD

F-05

DOOR

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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 <Power window main switch
(incorporated with Door lock switch) check> : Go to

Step 3.

By a Voltmeter <Power window sub switch
(incorporated with Door lock switch) check> : Go to

Step 4.

By a Voltmeter <Door lock key cylinder switch (RH)
check> : Go to Step 5.

STEP 2. Check the input signal (by using the pulse check)
(by using MB991958).
Check the input signal (door lock switch or door lock key cylin-
der switch) 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 or the front passenger's door lock switch

from "LOCK" to "UNLOCK" or vice versa.

(4) Use the passenger’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 21.
NO <The power window main switch (incorporated with
door lock switch) input signal> : Go to Step 6.
NO <The power window sub switch (incorporated with
door lock switch) input signal> : Go to Step 11.
NO <The door lock key cylinder switch (RH) input
signal> : Go to Step 16.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

DOOR

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STEP 3. Check the ETACS-ECU input signal from the
power window main switch (incorporated with door lock
switch) (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

power window main switch (incorporated with door lock
switch) is operated (lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 21.
NO : Go to Step 6.

STEP 4. Check the input signal from the power window
sub switch (incorporated with door lock switch) (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

power window sub switch (incorporated with door lock
switch) is operated (lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 21.
NO : Go to Step 11.

STEP 5. Check the input signal from the door lock key
cylinder switch (RH) (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 (RH) is operated (lock/unlock).

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU and then go to Step 21.
NO : Go to Step 16.

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

7

6

5

4

3

2

1

14

13

12

11

10

9

8

16

15

AC004323

MB991529

GROUND TERMINAL

ETACS TERMINAL

AB