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

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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

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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

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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