Mitsubishi Montero (2004+). Manual — part 801

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-461

STEP 3. Check the input signal by using "DATA LIST"
menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON or START

• Driver’s door: open

Operate scan tool MB991958 according to the procedure below
to display "ETACS ECU."

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."

Check that normal conditions are displayed on the items
described in the table below.

Q: Are normal conditions displayed on the "IG SW (IG1)"

and "FRONT DOOR SW"?
Normal conditions are displayed for all the items : Go to

Step 4.

Normal condition is not displayed on the "IG SW (IG1)" :

Refer to Inspection Procedure O-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1)

P.54B-505

."

Normal condition is not displayed on the "FRONT
DOOR SW" : Refer to Inspection Procedure O-5

"ETACS-ECU does not receive any signal from the
driver's or the front passenger's door switch

P.54B-520

."

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 30

IG SW (IG1)

ON

ITEM 32

FRONT DOOR SW

ON

AC309091

MB991911

MB991827

MB991824

AB

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-462

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 MB991958 according to the procedure below
to display "PULSE CHECK."

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

Check if scan tool MB991958 sounds or not.

Q: When the key reminder switch and each door switch

are operated, does scan tool MB991958 sound in each
case?
Buzzer of scan tool MB991958 sounds normally :

Replace the ETACS-ECU. Verify that the dome light
illuminates normally.

Scan tool MB991958 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.54B-545

."

When one of the doors is opened and closed, scan tool
MB991958 does not sound : Refer to Inspection

Procedure P-4 "ETACS-ECU does not receive any
signal from all the door switches

P.54B-559

."

ITEM NAME

CONDITION

key reminder switch

Remove and reinsert the ignition
key

Each door switch

Open or close one of the doors

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-463

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 MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-10

."

IGNITION
KEY HOLE
ILLUMINATION
LIGHT

RELAY
BOX

FUSIBLE
LINK

1

ETACS-
ECU

· FRONT DOOR SWITCH
· IGNITION SWITCH (IG1)
· KEY REMINDER SWITCH

INPUT SIGNAL

Ignition Key Hole Illumination Light Circuit

ACX02274

FUSIBLE LINK (1)

AE

BATTERY

AC204170

CONNECTOR : D-28

BB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-464

.

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• 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

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

AC204172

CONNECTOR : D-202

AF

AC204174

CONNECTOR : D-224

D-224(B)

AG