Horn Function

HORN FUNCTION





Component Function Check
1.CHECK FUNCTION 1
1. Disconnect vehicle security horn relay.
2. Perform "VEHICLE SECURITY HORN" in "ACTIVE TEST" mode of "THEFT ALM" of "BCM" using CONSULT-III.
3. Check the horn operation.





Is the operation normal?
YES - GO TO 2.
NO - Go to SEE Diagnosis Procedure.
2.CHECK FUNCTION 2
1. Reconnect vehicle security horn relay.
2. Disconnect horn relay.
3. Perform "VEHICLE SECURITY HORN" in "ACTIVE TEST" mode of "THEFT ALM" of "BCM" using CONSULT-III.
4. Check the horn operation.





Is the operation normal?
YES - INSPECTION END
NO - Go to SEE Diagnosis Procedure.




Diagnosis Procedure
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. [1][2]Electrical Diagrams.
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.





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





Is the inspection result normal?
YES - Replace IPDM E/R. Service and Repair.
NO - Repair or replace harness.
4.CHECK VEHICLE SECURITY HORN RELAY POWER SUPPLY
1. Disconnect vehicle security horn relay.
2. Check voltage between vehicle security horn relay harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO-1 - Check 10 A fuse [No. 36 located in the fuse block (J/B)].
NO-2 - Check harness for open or short between vehicle security horn relay and fuse.
5.CHECK VEHICLE SECURITY HORN CONTROL CIRCUIT
1. Disconnect IPDM E/R connector.
2. Check continuity between IPDM E/R harness connector and vehicle security horn relay harness connector.





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





Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace harness.
6.CHECK VEHICLE SECURITY HORN CIRCUIT
1. Disconnect vehicle security horn connector.
2. Check continuity between vehicle security horn relay harness connector and vehicle security horn harness connector.





3. Check continuity between vehicle security horn relay harness connector and ground.





Is the inspection result normal?
YES - GO TO 7.
NO - Repair or replace harness.
7.CHECK VEHICLE SECURITY HORN RELAY
SEE Component Inspection.
Is the inspection result normal?
YES - Replace vehicle security horn.
NO - Replace vehicle security horn relay.




Component Inspection
1.CHECK VEHICLE SECURITY HORN RELAY
1. Turn ignition switch OFF.
2. Disconnect vehicle security horn relay.
3. Check voltage between vehicle security horn relay terminal and ground under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace vehicle security horn relay.