Mitsubishi Montero Sport (2004+). Manual - part 573

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-279

NOTE: After checking intermediate connector C-85, check the 
wires. If intermediate connector C-85 is damaged, repair or 
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion 

P.00E-2

.

Q: Is the harness wire between horn relay connector C-100 

(terminal No.3) and theft-alarm horn connector A-91 
(terminal No.1) in good condition?
YES : Go to Step 11.
NO :  Repair it. The theft-alarm horn should sound when the 

theft-alarm system is triggered.

STEP 11. Check that the theft-alarm horn is installed 
properly.
NOTE: The theft-alarm horn is grounded to the body through 
the installation bolts.
Q: Is the theft-alarm horn installation in good condition?

YES : Go to Step 12.
NO :  Repair it. The theft-alarm horn should sound when the 

theft-alarm system is triggered.

STEP 12. 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.

AC201907

11

4

3

9

8

10

5 6

2

1

7

CONNECTOR: C-85

AB

C-85

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-280

INSPECTION PROCEDURE 3: Headlights do not Flash when the Theft-alarm System is Triggered.

Headlight Drive Circuit

AC003830

CONNECTOR: C-70

AI

C-70

AC003830

CONNECTOR: C-85

AH

C-85

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-281

.

TECHNICAL DESCRIPTION (COMMENT)
If the headlights work normally, the ETACS-ECU may 
be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Damaged harness wires or connectors

.

DIAGNOSIS

STEP 1. Check the headlight operation.
Q: Do the headlights illuminate normally?

YES : Go to Step 2.
NO :  Check the headlight circuit.

STEP 2. Check the ETACS-ECU.

(1) Disconnect the ETACS-ECU connector D-26 and measure 

at the harness side.

(2) Lighting switch OFF position.

(3) Check that the headlight illuminates when terminal number 

29 and ground.

Q: Do the headlights illuminates?

YES : Replace the ETACS-ECU. There is no action to be 

taken.

NO :  Go to Step 3.

AC003524

CONNECTOR: D-26

AC

JUNCTION BLOCK (REAR)

D-26 (B)

AC201902

1

2

8 7

4

10

5

11

12

6

9

3

CONNECTOR: D-26

AB

COMPONENT SIDE

JUNCTION BLOCK (REAR)

21

22

23

24

25

26

27

28

29

30

31

32

D-26 (B)

21

22

23

24

25

26

27

28

29

30

31

32

AC003845

D-26 HARNESS CONNECTOR:
COMPONENT SIDE

AC

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-282

STEP 3. Check the harness wires between joint connector 
C-70 (terminal No.26) and ETACS-ECU connector D-26 
(terminal No.29).

NOTE: After checking intermediate connector C-85, check the 
wires. If intermediate connector C-85 is damaged, repair or 
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion 

P.00E-2

.

Q: Are the harness wires between joint connector C-70 

(terminal No.26) and ETACS-ECU connector D-26 
(terminal No.29) in good condition?
YES : Go to Step 4.
NO :  Repair or replace them. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

. The 

headlights are flash when the theft-alarm system is 
triggered.

AC201908

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

CONNECTOR: C-70

AB

C-70

AC201902

1

2

8 7

4

10

5

11

12

6

9

3

CONNECTOR: D-26

AB

COMPONENT SIDE

JUNCTION BLOCK (REAR)

21

22

23

24

25

26

27

28

29

30

31

32

D-26 (B)

AC201907

11

4

3

9

8

10

5 6

2

1

7

CONNECTOR: C-85

AB

C-85