Mitsubishi Montero (2002-2004). Manual - part 361

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-491

STEP 12. Check the horn relay.

Q: Is the horn relay normal?

YES : Go to Step 13.
NO :  Replace the horn relay. All the vehicle horn (including 

the theft-alarm horn) should sound when the theft-
alarm system is triggered.

STEP 13. Check the battery power supply circuit to the 
horn relay. Test at horn relay connector A-10X.
(1) Disconnect horn relay connector A-10X and measure the 

voltage available at the wiring harness side of the 
connector.

(2) Measure the voltage between terminal 3 and ground, and 

also between terminal 5 and ground.

• The voltage should be approximately 12 volts (battery 

positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 16.
NO :  Go to Step 14.

BATTERY 
VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

4 

− 5

Open circuit

1 

− Battery (−) 

terminal,
3 

− Battery (+) 

terminal

4 

− 5

Less than 2 ohms

1

2 3

4

5

1

3

4

5

AC204637

RELAY SIDE

AC

HORN RELAY

AC204183

CONNECTOR : A-10X

RELAY BOX SIDE

AD

2 1

5

4

3

1

2

3

4

5

ACX01571AD

CONNECTOR A-10X
(RELAY BOX SIDE)

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-492

STEP 14. Check horn relay connector A-10X for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is horn relay connector A-10X in good condition?

YES : Go to Step 15.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. All the vehicle horn (including the theft-alarm 

horn) should sound when the theft-alarm system is 
triggered.

STEP 15. Check the wiring harness between horn relay 
connector A-10X (terminals 3 and 5) and the battery.
Q: Is the wiring harness between horn relay connector A-

10X (terminals 3 and 5) and the battery in good 
condition?
YES : Replace the ETACS-ECU. All the vehicle horn 

(including the theft-alarm horn) should sound when 
the theft-alarm system is triggered.

NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. All the 
vehicle horn (including the theft-alarm horn) should 
sound when the theft-alarm system is triggered.

AC204183

CONNECTOR : A-10X

RELAY BOX SIDE

AD

2 1

5

4

3

AC204183

CONNECTOR : A-10X

RELAY BOX SIDE

AD

2 1

5

4

3

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-493

STEP 16. Check horn relay connector A-10X and joint 
connector (3) A-17 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Is horn relay connector A-10X and joint connector (3) A-

17 in good condition?
YES : Go to Step 17.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. All the vehicle horn (including the theft-alarm 

horn) should sound when the theft-alarm system is 
triggered.

STEP 17. Check the wiring harnesses among horn relay 
connector A-10X (terminal 4) and joint connector (3) A-17 
(terminal 1).
Q: Are the wiring harnesses among horn relay connector 

A-10X (terminal 4) and joint connector (3) A-17 (terminal 
1) in good condition?
YES : Go to Step 18.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. All the 
vehicle horn (including the theft-alarm horn) should 
sound when the theft-alarm system is triggered.

AC204183

CONNECTOR : A-10X

RELAY BOX SIDE

AD

2 1

5

4

3

AC204167

CONNECTOR : A-17

AF

A-17(GR)

A-17(GR)

14

13

4

1112

5

3

10

8 9

2

7

1

6

AC204183

CONNECTOR : A-10X

RELAY BOX SIDE

AD

2 1

5

4

3

AC204167

CONNECTOR : A-17

AF

A-17(GR)

A-17(GR)

14

13

4

1112

5

3

10

8 9

2

7

1

6

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-494

STEP 18. Check ETACS-ECU connector D-223 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector D-223 in good condition?

YES : Go to Step 19.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. All the vehicle horn (including the theft-alarm 

horn) should sound when the theft-alarm system is 
triggered.

AC204183

CONNECTOR : A-10X

RELAY BOX SIDE

AD

2 1

5

4

3

AC204174

CONNECTOR : D-223

AC

D-223(B)

D-223(B)

HARNESS SIDE

42

43

50

51

45

46

53

54

52

44

48

5655

47

49

41