Mitsubishi Montero (2002-2004). Manual — part 258

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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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 MB991502 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54Ba-8

."

Central Door Lock Power Supply Circuit

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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.

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)

AC203774

CONNECTOR: H-10

AB

DRIVER'S DOOR

H-10

ACX02285

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

AK

D-211

D-209

D-217

JUNCTION BLOCK (FRONT VIEW)

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991502: Scan Tool (MUT-II)

• MB991862: SWS Monitor Kit

STEP 1. Use scan tool MB991502 to select "ECU COMM
CHK" on the SWS monitor display.
Check the following ETACS-ECU.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502. Also con-
nect SWS monitor kit MB991862 after turning on scan tool
MB991502.
(1) Connect scan tool MB991502 to the data link connector

(16-pin).

(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 MB991502 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 MB991502 should show "OK" on the "ECU

COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication

with ETACS-ECU is not possible

P.54Bb-25

."

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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STEP 2. Check the battery power supply circuit to the
ETACS-ECU. Test at ETACS-ECU connector D-222.
(1) Disconnect ETACS-ECU connector D-222, and measure at

the junction block side.

(2) Measure the voltage between terminal 12 and ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Go to Step 5.
NO : Go to Step 3.

STEP 3. Check the ETACS-ECU connector D-222 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the ETACS-ECU connector D-222 in good condition?

YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the central door locking system

should now works normally.

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222

ACX01570

19

20

1817 1615 141312 1110 9 8 7

6 5 4 3 2 1

AB

CONNECTOR D-222
(JUNCTION BLOCK SIDE)

AC204174

CONNECTOR : D-222

AB

1

2

3

5

6

4

9 8

121110

13

15 14

16

17

7

19

20

18

JUNCTION BLOCK SIDE

D-222