Component Tests and General Diagnostics

HORN FUNCTION





Description
Perform answer-back for each operation with horn.




Component Function Check
1.CHECK FUNCTION
1. Select HORN in "ACTIVE TEST" mode with CONSULT-III.
2. Check the horn (high/low) operation.





Is the operation normal?
YES - Inspection End.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Electrical Diagrams.
1.CHECK HORN FUNCTION
Check horn function with horn switch
Do the horns sound?
YES - GO TO 2
NO - [1][2]Electrical Diagrams.
2.CHECK HORN RELAY POWER SUPPLY
1. Turn ignition switch ON.
2. Perform "ACTIVE TEST" ("HORN") with CONSULT-Ill.





3. Using an analog voltmeter or an oscilloscope, check voltage between IPDM E/R connector E17 terminal 44 and ground.





Is the inspection result normal?
YES - Repair or replace open harness between IPDM E/R and horn relay.
NO - GO TO 3
3.CHECK HORN RELAY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R and horn relay connector.





3. Check continuity between IPDM E/R harness connector (A) and horn relay harness connector (B).





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





Is the inspection result normal?
YES - GO TO 4
NO - Repair or replace harness.
4.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - Replace IPDM E/R. Service and Repair.
NO - Repair or replace the malfunctioning part.