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Diagnosis Procedure

CHECK HORN SWITCH
Check horn function with horn switch

Do the horns sound?

YES: GO TO 2.

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

CHECK IPDM E/R POWER SUPPLY

Disconnect IPDM E/R connector.

Check voltage between malfunctioning IPDM E/R harness connector and ground.

(+)			(-)	Voltage (V) (Approx.)
IPDM E/R
Connector	Terminal
E6	Low	44	Ground	Battery voltage
E6	High	45	Ground	Battery voltage

Is the inspection result normal?

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

NO: GO TO 3.

CHECK IPDM E/R POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect IPDM E/R connector and horn relay connector.

Check continuity between IPDM E/R harness connector and malfunctioning horn relay harness connector.

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

Check continuity between driver seat control unit harness connector and ground.

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

Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace harness.

CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

Is the inspection result normal?

INSPECTION END