Mitsubishi Montero (2002-2004). Manual - part 360

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-487

STEP 4. Check the fusible link (2) line of the power supply 
circuit to the theft-alarm horn relay. Test at theft-alarm horn 
relay connector A-11X.
(1) Disconnect theft-alarm horn relay connector A-11X and 

measure the voltage available at the relay box 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 7.
NO :  Go to Step 5.

STEP 5. Check theft-alarm horn relay connector A-11X for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is theft-alarm horn relay connector A-11X in good 

condition?
YES : Go to Step 6.
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-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

1

2

3

4

5

ACX01571AC

CONNECTOR A-11X
(RELAY BOX SIDE)

AC204183

CONNECTOR : A-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-488

STEP 6. Check the wiring harness between theft-alarm 
horn relay connector A-11X (terminals 3 and 5) and fusible 
link (2).
Q: Is the wiring harness between theft-alarm horn relay 

connector A-11X (terminals 3 and 5) and fusible link (2) 
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.

STEP 7. Check theft-alarm horn relay connector A-11X and 
theft-alarm horn connector A-04 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are theft-alarm horn relay connector A-11X and theft-

alarm horn connector A-04 in good condition?
YES : Go to Step 8.
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-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

AC204167

CONNECTOR : A-04

HARNESS 
SIDE

A-04(B)

A-04(B)

AB

1

AC204183

CONNECTOR : A-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-489

STEP 8. Check the wiring harness between theft-alarm 
horn relay connector A-11X (terminal 4) and theft-alarm 
horn connector A-04 (terminal 1).
Q: Is the wiring harness between horn relay connector A-

11X (terminal 4) and theft-alarm horn connector A-04 
(terminal 1) in good condition?
YES : Go to Step 9.
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.

STEP 9. Check theft-alarm horn relay connector A-11X and 
ETACS-ECU connector D-223 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are theft-alarm horn relay connector A-11X and ETACS-

ECU connector D-223 in good condition?
YES : Go to Step 10.
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.

AC204167

CONNECTOR : A-04

HARNESS 
SIDE

A-04(B)

A-04(B)

AB

1

AC204183

CONNECTOR : A-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

AC204183

CONNECTOR : A-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

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

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-490

STEP 10. Check the wiring harness between theft-alarm 
horn relay connector A-11X (terminal 1) and ETACS-ECU 
connector D-223 (terminal 49).

NOTE: Also check intermediate connector D-27 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connectors D-27 is damaged, repair 
or replace the damaged component(s) as described in GROUP 
00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between theft-alarm horn relay 

connector A-11X (terminal 1) and ETACS-ECU 
connector D-223 (terminal 49) in good condition?
YES : Go to Step 11.
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.

STEP 11. Check the fit of the theft-alarm horn.
NOTE: The theft-alarm horn is grounded to the vehicle body via 
its mounting bolt.
Q: Is the theft-alarm horn installed correctly?

YES : Replace the ETACS-ECU. All the vehicle horn 

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

NO :  Install the theft-alarm horn correctly. All the vehicle 

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

AC204183

CONNECTOR : A-11X

RELAY BOX SIDE

AE

2 1

5

4

3

A-11X

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

AC204170

CONNECTOR : D-27

AH

10

4

8

7

3

9

5

1

6

2