Mitsubishi Evolution X. Manual - part 1083

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-693

STEP 8. Measure the voltage at ETACS-ECU connector 
C-307.
(1) Disconnect ETACS-ECU connector C-307, and measure 

the voltage wiring harness side.

(2) Measure the voltage between ETACS-ECU connector-307 

(terminal No. 2) and the body ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 10.
NO :  Go to Step 9.

STEP 9. Check the Wiring harness between ETACS-ECU 
connector C-307 (terminal No. 2) and fusible link (36).

• Check the power supply line for open circuit.

Q: Is the check result normal?

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 :  Repair the wiring harness between ETACS-ECU 

connector C-307 and fusible link (36).

STEP 10. Check ETACS-ECU connector C-317 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-317 in good condition?

YES : Go to Step 11.
NO :  Repair the damaged parts.

STEP 11. Check the Wiring harness between ETACS-ECU 
connector C-317 (terminal No. 2,9) and center panel unit 
connector C-124 (terminal No. 15,12).
NOTE: Also check joint connector C-103 for loose, corroded, or 
damaged terminals, or terminals pushed back in the connector. 
If joint connector C-103 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

• Check the input/output lines for open circuit and short cir-

cuit.

Q: Is the check result normal?

YES : Go to Step 12.
NO :  Repair the wiring harness between ETACS-ECU 

connector C-317 and center panel unit connector 
C-124.

AC402679 FH

Harness side: C-307

THEFT ALARM

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CHASSIS ELECTRICAL

54A-694

STEP 12. Retest the system.
Q: Does the theft-alarm 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.

Inspection Procedure 2: The interior alarm does not work normally while the theft-alarm is triggered.

CAUTION

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

.

TECHNICAL DESCRIPTION (COMMENT)

If the interior alarm does not work normally, the input 
signal circuits to the components below, 
ETACS-ECU, or combination meter built-in tone 
alarm may have a problem.

• Hood switch

• All of the door switches

• Trunk latch switch

.

TROUBLESHOOTING HINTS

• The ETACS-ECU may be defective

• Combination meter 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:

• 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)

THEFT ALARM

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CHASSIS ELECTRICAL

54A-695

STEP 1. 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.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.54A-685

."

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

YES : Diagnose the ETACS-ECU (Refer to 

P.54A-582

).

NO :  Go to Step 2.

STEP 2. Using scan tool MB991958, check actuator test. 
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the actuator test mode.

• Item 12: Tone alarm

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Replace the combination meter.

STEP 3. Retest the system.
Check that the theft-alarm works normally.
Q: Does the theft-alarm 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.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

THEFT ALARM

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CHASSIS ELECTRICAL

54A-696

Inspection Procedure 3: Theft-alarm horn does not sound while the theft-alarm system is triggered.

CAUTION

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

Theft-alarm Horn Circuit

ETACS-ECU

RELAY
BOX

FUSIBLE
LINK

36

THEFT-ALARM
HORN
RELAY

THEFT-ALARM
HORN

AC709111

Connector: A-18X

AI

AC708949

Connector: A-09

AF