Mitsubishi Montero (2002-2004). Manual — part 289

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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General circuit diagram for the keyless entry system

SYMPTOM PROCEDURES

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SWS SYMPTOM PROCEDURES

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SYMPTOM PROCEDURES

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INSPECTION PROCEDURE E-1: Keyless Entry System: Keyless entry system does not operate.

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"

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CIRCUIT OPERATION
A receiver is incorporated in the ETACS-ECU. This
receiver receives a lock or unlock signal from the
transmitter.

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TROUBLESHOOTING HINTS

• The transmitter may be defective

• The ETACS-ECU may be defective

Transmitter ("LOCK"/"UNLOCK") Input Signal

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 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.
(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

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STEP 2. Check the input signal (by using the pulse check
mode of the monitor.)
Check the input signals from the transmitter.
(1) Connect scan tool MB991502 to the data link connector

(16-pin).

(2) Operate scan tool MB991502 as follows:

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

(3) Push the transmitter "LOCK" or "UNLOCK" switch.
(4) Check that scan tool MB991502 sounds.
Q: When the transmitter "LOCK" or "UNLOCK" switch is

pushed, does scan tool MB991502 sound?
YES : Replace the ETACS-ECU. Verify that all the doors

can be locked or unlocked by using the transmitter.

NO : Refer to Inspection Procedure P-10 "The ETACS-

ECU does not receive a signal from the lock, unlock
switch or panic switch

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AC204222AB

16-pin

13-pin

MB991502

MB991862

AC204222AB

16-pin

13-pin

MB991502

MB991862