Mitsubishi Montero Sport (2004+). Manual - part 578

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-299

.

CIRCUIT OPERATION
The ETACS-ECU receives the input signal from the 
hood switch, and then judges the operation of each 
function.

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TECHNICAL DESCRIPTION (COMMENT)
The hood switch input signal is used for judging the 
operation of the theft-alarm function, so if there is a 
malfunction, these functions may not operate cor-
rectly.

• Malfunction of the hood switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

.

DIAGNOSIS

Required Special Tools:

• MB991223: Test Harness Set

• MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the hood switch.

(1) Remove the hood switch.
(2) Check for continuity between the hood switch.

Q: Is hood switch in good condition?

YES : Go to Step 2.
NO :  Replace the hood switch.

AC003530

CONNECTOR: C-85

AC

C-85

AC003531

CONNECTOR: D-26

JUNCTION BLOCK (REAR)

AC

D-26 (B)

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Hood switch 
unpressed

1 

− 2

Less than 2 ohms

Hood switch 
depressed

1 

− 2

Open circuit

AC003759

1

2

VIEW A

A

AB

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-300

STEP 2. Check hood switch connector A-94 and 
ETACS-ECU connector D-26 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.

Q: Are hood switch connector A-94 and ETACS-ECU 

connector D-26 in good condition?
YES : Go to Step 3.
NO :  Repair or replace them. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

.

STEP 3. Check the harness wires between hood switch 
connector A-94 (terminal No.1) and ETACS-ECU connector 

D-26 (terminal No.31) for damage.

AC201913

1

2

CONNECTOR: A-94

AB

COMPONENT 
SIDE

A-94 (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)

AC201913

1

2

CONNECTOR: A-94

AB

COMPONENT 
SIDE

A-94 (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)

THEFT ALARM

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CHASSIS ELECTRICAL

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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 hood switch connector 

A-94 (terminal No.1) and ETACS-ECU connector D-26 
(terminal No.31) in good condition?
YES : Go to Step 4.
NO :  Repair or replace them. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

.

STEP 4. Check the harness wires between hood switch 
connector A-94 (terminal No.2) and ground.

NOTE: After checking joint connector (5) C-14, check the 
wires. If joint connector (5) C-14 is damaged, repair or replace 
it. Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Are the harness wires between hood switch connector 

A-94 (terminal No.2) and ground in good condition?
YES : Go to Step 5.
NO :  Repair or replace them. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

.

AC201907

11

4

3

9

8

10

5 6

2

1

7

CONNECTOR: C-85

AB

C-85

AC201913

1

2

CONNECTOR: A-94

AB

COMPONENT 
SIDE

A-94 (B)

AC201914

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-14

AB

C-14

THEFT ALARM

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CHASSIS ELECTRICAL

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STEP 5. 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 8: Check the Circuit (Power Supply Line) from the Battery to the 
ETACS-ECU.

ETACS-ECU'S Battery Circuit