Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. INSPECTION START 

   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.

2. CHECK HORN FUNCTION 

   Check that horns function properly using horn switch.

   Do horns sound? 

   YES: GO TO  3.

   NO: Check horn circuit. Refer to "WIRING DIAGRAM ".

3. CHECK HORN CONTROL CIRCUIT 
   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	H1	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.

4. CHECK ANTI-THEFT HORN RELAY POWER SUPPLY 
   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-1: Check 10 A fuse [No. 57 located in the fuse and fusible link box].

   NO-2: Check harness for open or short between anti-theft horn relay and fuse.

5. CHECK ANTI THEFT HORN CONTROL CIRCUIT 
   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.

6. CHECK ANTI-THEFT HORN CIRCUIT 
   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.

7. CHECK ANTI-THEFT HORN RELAY 

   Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: Replace anti-theft horn.

   NO: Replace anti-theft horn relay.