Mitsubishi 380. Manual - part 50

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-197

STEP 13. Check horn relay connector A-06X for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is horn relay connector A-06X in good condition?

YES : Go to Step 14.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the horn sounds normally.

STEP 14. Check the wiring harness between horn relay 
connector A-06X (terminal 4) and horn (LOW) connector 
A-36 (terminal 1).
Q: Is the wiring harness between horn relay connector 

A-06X (terminal 4) and horn (LOW) connector A-36 
(terminal 1) in good condition?
YES : Replace the ETACS-ECU. Verify that the horn sounds 

normally.

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. Verify that 
the horn sounds normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

16DB355A

A-36 (B)

CONNECTOR: A-36,A-37

A-37

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-198

STEP 15. Check horn relay connector A-06X for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is horn relay connector A-06X in good condition?

YES : Go to Step 16.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the horn sounds normally.

STEP 16. Check the horn relay.

Q: Is the horn relay normal?

YES : Go to Step 17.
NO :  Replace the horn relay. Verify that the horn sounds 

normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

BATTERY 
VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

1 

− 4

Open circuit

• Connect 

terminal 2 to the 
positive battery 
terminal

• Connect 

terminal 3 to the 
negative battery 
terminal

1 

− 4

Less than 2 ohms

AC306638

1

4

3

2

2

1

3 4

FRONT OF 
VEHICLE

HORN RELAY

AB

CONNECTOR: A-06X

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-199

STEP 17. Check the battery power supply circuit to the 
horn relay. Measure the voltage at horn relay connector 
A-06X.
(1) Disconnect horn relay connector A-06X and measure the 

voltage available at the relay box side of the connector.

(2) Measure the voltage between terminal 1 and ground, and 

also between terminal 2 and ground.

• The voltage should measure approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 19.
NO :  Go to Step 18.

STEP 18. Check the wiring harness between horn relay 
connector A-06X (terminals 1 and 2) and the battery.
Q: Is the wiring harness between horn relay connector 

A-06X (terminals 1 and 2) and the battery in good 
condition?
YES : No action is necessary and testing is complete.
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. Verify that 
the horn sounds normally.

STEP 19. Check ETACS-ECU connector C-217 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-217 in good condition?

YES : Go to Step 20.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the horn sounds normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

AC209365EL

CONNECTOR A-06X
(RELAY BOX SIDE)

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

16DB307A

CONNECTOR: C-217

HARNESS SIDE

25

26

27

28

29

21

22

23

24

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-200

STEP 20. Check the wiring harness between horn relay 
connector A-06X (terminal 3) and ETACS-ECU connector 
C-217 (terminal 44).

NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-29 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 horn relay connector 

A-06X (terminal 3) and ETACS-ECU connector C-217 
(terminal 44) in good condition?
YES : Go to Step 21.
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. Verify that 
the horn sounds normally.

AC305992

RELAY BOX SIDE

CONNECTOR: A-06X

AC

FRONT OF VEHICLE

16DB307A

CONNECTOR: C-217

HARNESS SIDE

25

26

27

28

29

21

22

23

24

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

JUNCTION BLOCK

(REAR VIEW)

52DB014A

CONNECTOR: C-29