Mitsubishi Montero (2002-2004). Manual - part 354

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-463

STEP 4. Check the input signal (by using the pulse check 
mode of the monitor.)
Check the following switches and input signals:

• Key reminder switch

• All door switches

Operate scan tool MB991502 according to the procedure below 
to display "PULSE CHECK."

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

Check if scan tool MB991502 sounds or not.

Q:  When the key reminder switch and each door switch 

are operated, does scan tool MB991502 sound in each 
case?
YES : Replace the ETACS-ECU. Verify that the dome light 

illuminates normally.

NO : 

• Scan tool MB991502 does not sound when the 

ignition key is removed and reinserted: Refer to 
Inspection Procedure P-1 "ETACS-ECU does not 
receive any signal from the key reminder switch 

P.54Bc-49

."

• When one of the doors is opened and closed, 

scan tool MB991502 does not sound: Refer to 
Inspection Procedure P-4 "ETACS-ECU does not 
receive any signal from all the door switches 

P.54Bc-62

."

ITEM NAME

CONDITION

key reminder switch

Remove and reinsert the ignition 
key

Each door switch

Open or close one of the doors

AC204222AB

16-pin

13-pin

MB991502

MB991862

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-464

INSPECTION PROCEDURE M-3: Interior Light: The ignition key hole illumination light does not 
illuminate or go out normally.

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

."

Ignition Key Hole Illumination Light Circuit

ACX02274

FUSIBLE LINK (1)

AE

BATTERY

AC204170

CONNECTOR : D-28

BB

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-465

.

CIRCUIT OPERATION

• When the driver's door is opened with the ignition 

switch at "ACC" position, the ETACS-ECU illumi-
nates the ignition key hole illumination light.

• The ignition key hole illumination light goes out in 

30 seconds after the driver's door is closed. The 
ignition key hole illumination light remains illumi-
nated for 30 seconds after the ignition key is 
pulled out.

• The ETACS-ECU operates the ignition key hole 

illumination light according to the input signals 
from the following switches:

• Ignition switch (IG1): OFF

• Key reminder switch: OFF

• Vehicle condition

• Ignition switch: ACC position

• Ignition key is inserted in the ignition key cyl-

inder

.

TECHNICAL DESCRIPTION (COMMENT)
Is the ignition key hole illumination light does not illu-
minate, the input circuits from the switches described 
in "CIRCUIT OPERATION", the key reminder switch 
(ignition key hole illumination light bulb) or the 
ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The driver's door switch may be defective

• The key reminder switch (key reminder switch or 

ignition key hole illumination light bulb) may be 
defective

• 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

AC204172

CONNECTOR : D-202

AF

AC204174

CONNECTOR : D-224

D-224(B)

AG

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-466

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 

P.54Bb-25

."

AC204222AB

16-pin

13-pin

MB991502

MB991862