Diagnostic Aids
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OnStar® RemoteLink™ applications or "apps" downloads are available to owners of certain mobile devices. Unwanted or inadvertent horn activations have been associated with these applications to which the customer may be unaware. Contact the GM Technical Assistance Center regarding information on a remedy for this situation.
A short to ground in the horn relay control circuit or a short to voltage in the horn control circuit will cause the horn to sound continuously until the horn overheats and become inoperative.
Rotate the steering wheel while pressing the horn pad to identify intermittent and poor connections within the steering column.
If diagnosing a Horn- Poor Tone condition, inspect the following:
- Debris or water in the horn assembly.
- Proper horn mounting hardware torque. Refer to Fastener Tightening Specifications .
- Debris in the joint where the horns attach to the vehicle.
- Debris in direct contact with the horn
- Vehicle components vibrating while the horn is sounding