Mitsubishi Montero Sport (2004+). Manual - part 576

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-291

NOTE: After checking joint connector C-10, check the wires. If 
joint connector C-10 is damaged, repair or replace it. Refer to 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Are the harness wires between data link connector C-69 

(terminal No.1 and 9) and ETACS-ECU connector D-27 
(terminal No.48 and 55) in good condition?
YES : Go to Step 5.
NO :  Repair them. Scan tool MB991502 should 

communicate with the switch signals.

STEP 5. Measure the resistance at the ETACS-ECU ground 
circuit.

(1) Disconnect ETACS-ECU connector D-11 and measure at 

the harness side.

(2) Measure the resistance between terminal 10 and ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with 

this range?
YES : Replace the ETACS-ECU. Scan tool MB991502 

should communicate with the switch signals.

NO :  Go to Step 6.

AC201909

8

19

7

6

5

16

15

17 18

4

3

2

10 11 12 13

1
9

14

CONNECTOR: C-10

AB

C-10

AC201084

JUNCTION 
BLOCK (REAR)

D-11

COMPONENT SIDE

AB

CONNECTOR: D-11

1

2

3

4

5

7

9

10

6

8

11

12

AC004007AC

D-11 
HARNESS CONNECTOR:
COMPONENT SIDE

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-292

STEP 6. Check ETACS-ECU connector D-11 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is ETACS-ECU connector D-11 in good condition?

YES : Go to Step 7.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Scan tool MB991502 

should communicate with the switch signals.

STEP 7. Check the harness wires between ETACS-ECU 
connector D-11 and ground.

NOTE: After checking junction block connector D-13, check the 
wires. If junction block connector D-13 is damaged, repair or 
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion 

P.00E-2

.

Q: Are the harness wires between ETACS-ECU connector 

D-11 and ground in good condition?
YES : Go to Step 8.
NO :  Repair them. Scan tool MB991502 should 

communicate with the switch signals.

AC201084

JUNCTION 
BLOCK (REAR)

D-11

COMPONENT SIDE

AB

CONNECTOR: D-11

1

2

4

5

3

6

8

9

7

10

11

13

14

12

16

17

201918

15

AC201086

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-293

STEP 8. Recheck for malfunction.
Q: Is a malfunction eliminated?

YES : This procedures 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 6: The Key Reminder Switch Signal is not Sent to the ETACS-ECU.

AC004252 AB

Key Reminder Switch Input Signal Circuit

THEFT ALARM

TSB Revision

CHASSIS ELECTRICAL

54-294

.

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

.

TECHNICAL DESCRIPTION (COMMENT)
The key reminder switch input signal is used for judg-
ing the operation of the following functions. Thus, if 
there is a malfunction, these functions may not oper-
ate correctly.

• Ignition key tone alarm function

• Forgotten key prevention function

• Dome light dimming function

• Keyless entry system

• Theft-alarm function

.

TROUBLESHOOTING HINTS

• Malfunction of the key reminder switch

• Malfunction of the ETACS-ECU 

• Damaged harness wires or connectors 

.

AC003622

CONNECTOR: C-72

AD

C-72 (B)

AC003444 AB

CONNECTOR: D-11, D-13

D-11

D-13

JUNCTION BLOCK (REAR)

AC003433

CONNECTOR: D-16

AC

D-16