Mitsubishi Outlander GS45X. Manual — part 218

THEFT ALARM

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CHASSIS ELECTRICAL

54A-869

STEP 15. Check the horn (LO) work normally.
Connect the battery as shown, and verify that the horn sounds.
Q: Does the horn (LO) work normally?

YES : Go to Step 16.
NO : Replace the horn (LO).go to Step 16.

STEP 16. Retest the theft-alarm system.
Q: Does the theft-alarm system work normally?

YES : The trouble can be an intermittent malfunction (Refer

to GROUP 00, How to use
Troubleshooting/inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-15

).

NO : Replace the ETACS-ECU.

AC607630AC

THEFT ALARM

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CHASSIS ELECTRICAL

54A-870

Inspection Procedure 5: The activated theft alarm siren sounds even though no faulty operation is
made.<Vehicles with theft alarm sensor>

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communi-
cation circuit are normal.

.

COMMENTS ON TROUBLE SYMPTOM

If the activated theft alarm siren sounds even though
no faulty operation is made, the theft alarm siren may
not be able to receive the signal from the
ETACS-ECU via the LIN cutoff control unit.
NOTE: The theft alarm siren may be sounding by
false alarm. Investigate what kind of situation the
theft alarm siren sounded under. Check if there was
any condition that caused false alarm.

.

PROBABLE CAUSES

• theft alarm siren may be defective

• LIN cutoff control unit 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

Security Alarm Siren Communication Circuit

ETACS-
ECU

LIN CUTOFF
CONTROL UNIT

AC901075BB

Connectors: C-34, C-40

C-34 (BR)

C-40

ACA02655BC

Connectors: C-301, C-312

C-312

C-301

THEFT ALARM

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CHASSIS ELECTRICAL

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DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with

CAN communication system)

STEP 1. Vehicle status check when theft alarm siren is
sounding
(1) Since it is suspected that the theft alarm has sounded

accidentally, investigate whether the vehicle is under the
situation below. Repair if an abnormality is found.

• The windows and sunroof are open.

• Some moving accessories are fitted in the vehicle.

• The interior equipment has been modified before a mal-

function occurs.

(2) Set the sensitivity level of theft alarm sensor to Level 4 by

using the customization function.

(3) Check if the theft alarm siren sounds during the status of

"Ready to be triggered" even though no faulty operation is
made.

Q: Is the check result normal?

YES : Go to Step 2
NO : The diagnosis is complete.

THEFT ALARM

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CHASSIS ELECTRICAL

54A-872

STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan
tool (M.U.T.-III)

P.54A-839

."

(1) Turn the ignition switch to the "ON" position.
(2) Check whether the ETACS-ECU DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU (Refer to

P.54A-733

).

NO : Go to Step 3.

STEP 3. LIN cutoff control unit check
Check for continuity of the LIN cutoff control unit.(Refer to

P.54A-879

.)

Q: Is the check result normal?

YES : Go to Step 4.
NO : Replace LIN cutoff control unit.

STEP 4. Check ETACS-ECU connector C-312, C-301 and
LIN cutoff control unit C-40 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector
Q: Is the check result normal?

YES : Go to Step 5.
NO : Repair the defective connector.

STEP 5. Check the Wiring harness between ETACS-ECU
connector 301 (terminal No. 13) and LIN cutoff control unit
C-40 (terminal No. 3).
Check the signal line for open circuit and short circuit.
Q: Is the check result normal?

YES : Go to Step 6.
NO : Repair the wiring harness.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB