Horn Function Circuit Check

Horn Function Circuit Check

Description

Perform answer-back for each operation with horn.

Component Function Check

1. CHECK FUNCTION

1 Use SDT to perform Active Test "MULTIREMOTE ENT".
2 Touch "HORN" to check that it works normally.






Is the operation normal?
YES
Inspection End.
NO
Refer to "Diagnosis Procedure".

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Remote Keyless Entry System: Wiring Diagram [King Cab] Remote Keyless Entry System [King Cab] ] or [Remote Keyless Entry System: Wiring Diagram [Crew Cab] Remote Keyless Entry System [Crew Cab] ].

1. CHECK HORN FUNCTION

Check horn function with horn switch

Do the horns sound?
YES
GO TO 2
NO
Refer to [Horn: Wiring Diagram] Electrical Diagrams.

2. CHECK HORN RELAY POWER SUPPLY

1 Turn ignition switch ON.
2 Perform "HORN" in Active Test mode for "MULTIREMOTE ENT" with SDT.
3 Using an oscilloscope or analog voltmeter, check voltage between IPDM E/R connector E122 terminal 45 and ground.











Is the inspection result normal?
YES
Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.
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 and horn relay harness connector.











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

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.

Is the inspection result normal?
YES
Replace IPDM E/R. Refer to [IPDM E/R: Removal and Installation of IPDM E/R] Service and Repair.
NO
Repair or replace the malfunctioning part.