Mitsubishi Outlander GS45X. Manual - part 211

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-841

HOW TO DIAGNOSE THE CAN BUS LINES

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)

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it 

matches the vehicle being diagnosed.

• If they match, go to step 8.

• If not, go to step 5.

5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again 

that it matches the vehicle being diagnosed.

• If they match, go to step 8.

• If not, go to step 5.

8. Select the "OK" button.
9. When the optional equipment screen is displayed, choose 

the one which the vehicle is fitted with, and then select the 
"OK" button.

DIAGNOSIS CODE CHART

M1547001400166

DTC No.

Description

Reference page

B120A

Theft alarm siren error

P.54A-842

B120B

Theft alarm sensor error

P.54A-844

B120C

Theft alarm siren Flat Battery

P.54A-847

U1006

Theft alarm siren LIN timeout

Refer to GROUP 54B - 
Diagnostic Trouble Code Chart 

P.54B-23

U1007

Theft alarm sensor LIN timeout

Refer to GROUP 54B - 
Diagnostic Trouble Code Chart 

P.54B-30

U1539

Theft alarm siren LIN checksum

P.54A-848

U1540

Theft alarm SNSR. LIN checksum

P.54A-849

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-842

DIAGNOSTIC TROUBLE CODE PROCEDURES 

 

<VEHICLES WITH THEFT ALARM SENSOR>

DTC B120A Theft alarm siren error

CAUTION

Before replacing the ECU or sensor, ensure that the power supply circuit, the ground circuit and the 
communication circuit are normal.

.

DIAGNOSTIC FUNCTION

• The theft alarm siren communicates with the 

ETACS-ECU by the LIN via the LIN cutoff control 
unit. The diagnostic trouble code No. B120A is 
set if the communication data between the 
ETACS-ECU and theft alarm siren has an error 
when the relay inside the LIN cutoff control unit is 
ON (alarm is not activated.)

.

PROBABLE CAUSES

Malfunction of theft alarm siren

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

TSB Revision

CHASSIS ELECTRICAL

54A-843

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.
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 2.

STEP 2. Theft alarm siren operation check
(1) Set the theft alarm to the "Ready to be triggered" condition.
(2) Open the driver's door by using the ignition key.
(3) Check that the theft alarm siren sounds.
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 :  Go to Step 3.

STEP 3. Replace the theft alarm siren temporarily, and 
check whether the diagnostic trouble code is set.
Check again if the diagnostic trouble code is set to the 
ETACS-ECU.
(1) Erase the diagnosis trouble code.
(2) Turn the ignition switch from the LOCK (OFF) position to the 

ON position.

(3) Check if diagnostic trouble code is set.
Q: Is the DTC set?

YES : Replace the ETACS-ECU.
NO :  Replace the theft alarm siren.

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54A-844

DTC B120B Theft alarm sensor error

CAUTION

Before replacing the ECU or sensor, ensure that the power supply circuit, the ground circuit and the 
communication circuit are normal.

.

DIAGNOSTIC FUNCTION

The theft alarm sensor communicates with the 
ETACS-ECU via the LIN bus line. If the diagnostic 
trouble code No. B120B is set, the theft alarm sensor 
itself may be defective.
NOTE: 

.

•

Diagnostic trouble code No.B120B may be set 
when the theft alarm sensor cover is improperly 
installed or is removed. Check if the theft alarm 
sensor cover is properly installed.

•

Diagnostic trouble code No.B120B is set when 
the ultrasonic wave transmission/reception part of 
the theft alarm sensor is covered. Check if the 
ultrasonic wave transmission/reception part of the 
theft alarm sensor was covered.

.

PROBABLE CAUSES

Malfunction of the theft alarm sensor

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)