Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the horn system. Refer to CHECKING AFTERMARKET ACCESSORIES in Wiring Systems.
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
- Perform the following if a horn buzzes or has a harsh tone:
- Inspect for debris in the joint where the horn fastens to the vehicle.
- Test the torque of the horn mounting hardware. The horn mounting hardware should be tightened to a torque of 10 N.m (7 lb ft).