Mitsubishi Montero Sport (2004+). Manual - part 574

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-283

STEP 4. Recheck for malfunction.
Q: Is a malfunction eliminated?

YES : This procedure is complete. (If no malfunctions are 

found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Point 

− How to 

Cope with Intermittent Malfunction 

P.00-7

.)

NO :  Go to Step 1.

INSPECTION PROCEDURE 4: Panic Alarm Function does not Work.

.

TECHNICAL DESCRIPTION (COMMENT)
If the keyless entry system is normal, the 
ETACS-ECU is defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU 

• Damaged harness wires or connectors 

.

DIAGNOSIS

Required Special Tools:

• MB991223: Test 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 (Vehicles without 

CAN communication system)

• MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the keyless entry system.
Q: Does the keyless entry system work normally?

YES : Go to Step 2 <when using scan tool MB991958> or 3   

<when using a voltmeter>.

NO :  Solve the problem first. Refer to GROUP 42. Keyless 

Entry System 

− Diagnosis 

P.42-154

.

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-284

STEP 2. Check the input signal (by using pulse check).

Check the input signals from the transmitter "PANIC" switch.

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 to the data link connector.
(2) Check that the tone alarm of scan tool MB991958 sounds 

when the input signal enters.

Q: Does the tone alarm of scan tool MB991958 sound when 

the input signal enters?
YES : Replace the ETACS-ECU. The panic alarm should 

work normally.

NO :  Check the transmitter input signal circuit. Refer to 

GROUP 42, Keyless Entry System 

− Diagnosis 

P.42-154

.

STEP 3. Check the input signal (by using a voltmeter).

Check the input signals from the transmitter "PANIC" switch.
(1) Use special tool MB991529 to connect a voltmeter between 

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the 

data link connector.

(2) Check that the voltmeter indicator deflects once when the 

input signal enters.

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU. The panic alarm should 

work normally.

NO :  Check the transmitter input signal circuit. Refer to 

GROUP 42, Keyless Entry System 

− Diagnosis 

P.42-154

.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC003527

GROUNDED TERMINAL

ETACS-ECU 
TERMINAL

MB991529

AB

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-285

INSPECTION PROCEDURE 5: Scan Tool MB991958 Communication is not Possible.

ETCS-ECU Power Supply and Scan Tool Communication Circuit

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-286

.

CIRCUIT OPERATION
The ETACS-ECU receives switch signals from the 
data link connector.

.

TECHNICAL DESCRIPTION (COMMENT)
The harness wires between the ETACS-ECU power 
supply line or the ETACS-ECU and the data link con-
nector may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Damaged harness wires or connectors

.

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 (Vehicles without 

CAN communication system)

• MB991529: Diagnostic Trouble Code Check Harness

AC004003AC

CONNECTOR: C-10

C-10

AC004002

AC

CONNECTOR: C-69

C-69 (B)

AC003445

JUNCTION BLOCK (REAR)

D-11

D-13

CONNECTORS: D-11, D-13

AC