Diagnosis Procedure

Check horn function using horn switch

Do the horns sound? 

YES: GO TO 2.

NO: Refer to "TYPE A : WIRING DIAGRAM - HORN - ".

1. Turn ignition switch ON.
2. Perform "ACTIVE TEST" ("HORN") using CONSULT-Ill.
3. Check voltage between malfunctioning horn relay harness connector and ground.
   VOLTAGE REFERENCE CHART
   
   

   (+)			(-)	Test item		Voltage (V) (Approx.)
   Horn relay			Ground
   Connector		Terminal
   E11	Low	1		HORN	ON	Battery voltage → 0 → Battery voltage
   E18	High	3			Other than above	Battery voltage

   Is the inspection result normal? 

   YES: GO TO  4.

   NO: GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and horn relay connector.
3. Check continuity between IPDM E/R harness connector and malfunctioning horn relay harness connector.
   CONTINUITY REFERENCE CHART
   
   

   IPDM E/R		Horn relay		Continuity
   Connector	Terminal	Connector	Terminal
   E6	44	E11	1	Existed
   	45	E18	3

4. Check continuity between driver seat control unit harness connector and ground.
   CONTINUITY REFERENCE CHART
   
   

   IPDM E/R		Ground	Continuity
   Connector	Terminal
   E6	44		Not existed
   	45

   Is the inspection result normal? 

   YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

   NO: Repair or replace harness.

Refer to "INTERMITTENT INCIDENT ".

Is the inspection result normal? 

INSPECTION END