Security Control System (DTC/Circuit Diagnosis)

Perform inspection in accordance with procedure that confirms malfunction.

Which procedure confirms malfunction?

Component Function Check 1

GO TO 2.

Component Function Check 2

GO TO 4.

Check that horns function properly using horn switch.

Do horns sound?

YES

GO TO 3.

NO

Check horn circuit. Refer to appropriate Wiring Diagram .

1. Disconnect horn relay.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector and horn relay harness connector.

   IPDM E/R		Horn relay		Continuity
   Connector	Terminal	Connector	Terminal
   E119	23	H-1	1	Yes

4. Check continuity between IPDM E/R harness connector and ground.

   IPDM E/R		Ground	Continuity
   Connector	Terminal
   E119	23		No

Is the inspection result normal?

YES

Replace IPDM E/R. Refer to Removal and Installation .

NO

Repair or replace harness.

1. Disconnect anti-theft horn relay.
2. Check voltage between anti-theft horn relay harness connector and ground.

   (+)		(-)	Voltage (V)
   Anti-theft horn relay
   Connector	Terminal
   E8	2	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

NO

Check 10 A fuse [No. 57 located in the fuse and fusible link box].

NO

Check harness for open or short between anti-theft horn relay and fuse.

1. Disconnect IPDM E/R connector.
2. Check continuity between IPDM E/R harness connector and anti-theft horn relay harness connector.

   IPDM E/R		Anti theft horn relay		Continuity
   Connector	Terminal	Connector	Terminal
   E119	22	E8	1	Yes

3. Check continuity between IPDM E/R harness connector and ground.

   IPDM E/R		Ground	Continuity
   Connector	Terminal
   E119	22		No

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace harness.

1. Check continuity between anti-theft horn relay harness connector and anti-theft horn harness connector.

   Anti-theft horn relay		Anti-theft horn		Continuity
   Connector	Terminal	Connector	Terminal
   E8	3	E231	1	Yes

2. Check continuity between anti-theft horn relay harness connector and ground.

   Anti-theft horn relay		Ground	Continuity
   Connector	Terminal
   E8	3		No

Is the inspection result normal?

YES

GO TO 7.

NO

Repair or replace harness.

Refer to Component Inspection .

Is the inspection result normal?

YES

Replace anti-theft horn.

NO

Replace anti-theft horn relay.