Mitsubishi Montero (2004+). Manual - part 806

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-481

STEP 8. Check the wiring harness between theft-alarm
indicator light connector D-105 (terminal 1) and
ETACS-ECU connector D-224 (terminal 40).
Q: Is the wiring harness between theft-alarm indicator

light connector D-105 (terminal 1) and ETACS-ECU
connector D-224 (terminal 40) in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The
theft-alarm indicator light should illuminate, and the
theft-alarm system should be set normally.

AC204170

CONNECTOR : D-105

HARNESS
SIDE

D-105(B)

AC204174

CONNECTOR : D-224

D-224(B)

HARNESS SIDE

3433

3029

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-482

STEP 9. Check the input signal by using "DATA LIST"
menu of the SWS monitor.
Satisfy the following conditions to check the driver's and front
passenger's door switches.

• Driver's door: Open (driver's door switch is on)

However, the door should be closed when checking the
front passenger's door switch.

• Front passenger's door: Open (front passenger's door

switch is on)
However, the door should be closed when checking the
driver's door switch.

(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-7

(2) Connect SWS monitor kit MB991862 to the data link

connector (13-pin).

(3) 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."

(4) The scan tool should show the following values when each

switch is operated.
NOTE: The scan tool display changes when the driver's or
the front passenger's door is opened. If any of the doors is
open, the system can not be checked correctly.

Q: The scan tool shows the respective normal condition

for item "FRONT DOOR SW."
YES : Go to Step 10.
NO : Refer to Inspection Procedure O-5 "ETACS-ECU

does not receive any signal from the driver's or front
passenger's door switch

P.54B-520

ITEM No. ITEM NAME

NORMAL CONDITION

ITEM 32

FRONT DOOR SW ON

AC309091

MB991911

MB991827

MB991824

MB991806

MB991862

DATA LINK
CONNECTOR
(16-PIN)

DATA LINK
CONNECTOR
(13-PIN)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-483

STEP 10. Check the input signal (by using the pulse check
mode of the monitor.)
Check the input signals from the following switches:

• Key reminder switch

• Driver’s, front passenger’s, rear and back door lock actuator

switch

• Driver’s, front passenger’s and back door lock key cylinder

switch

• Food switch

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, driver’s, front

passenger’s, rear and back door lock actuator switches,
driver’s, front passenger’s and back door look key
cylinder switches, hood switch are operated, does scan
tool MB991958 sound in all cases?
Scan tool MB991958 is sound in all cases : Replace the

ETACS-ECU. The theft-alarm indicator light should
illuminate, and the theft-alarm system should be set
normally.

Scan tool MB991958 does not sound when the key
reminder switch is operated : Refer to Inspection

Procedure P-1 "ETACS-ECU does not receive any
signal from the key reminder switch

P.54B-545

Scan tool MB991958 does not sound when the driver's,
the front passenger's, the rear and the back door lock
actuator switches are operated : Refer to Inspection

Procedure P-6 "ETACS-ECU does not receive signals
from the driver's or the front passenger's door lock
actuator switches

P.54B-587

Scan tool MB991958 does not sound when the driver's,
the front passenger's, the rear and the back door lock
actuator switches are operated : Refer to Inspection

Procedure P-5 "ETACS-ECU does not receive signals
from the driver's and the front passenger's door lock

ITEM NAME

CONDITION

Key reminder switch

Remove and reinsert the
ignition key

Driver's, front passenger's,
rear and back door lock
actuator switches

Lock or unlock each door

Driver's, front passenger's,
and back door lock key
cylinder switches

Operate the door lock key
cylinder at each door

Hood switch

Open and close the hood

AC307591 AB

MB991911

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-484

key cylinder switches

P.54B-570

Scan tool MB991958 does not sound when the hood
switch is operated : Refer to Inspection Procedure P-9

"ETACS-ECU does not receive any signal from the
hood switch

P.54B-622

INSPECTION PROCEDURE N-2: Theft-alarm System: Horn does not sound when the theft-alarm is
triggered.

JOINT
CONNECTOR
(3)

ETACS-
ECU

THEFT-ALARM
HORN RELAY

HORN
RELAY

BATTERY

HORN

(LOW) (HIGT)

THEFT-ALARM
HORN

FUSIBLE
LINK

RELAY
BOX

Horn and Theft-alarm Horn Drive Circuit

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