A Symptoms - Horns

IMPORTANT: The following steps must be completed before using the symptom tables.
1. Perform Diagnostic System Check - Horns before using the symptom tables in order to verify that all of the following are true:
- There are no DTCs set.
- The body control module (BCM) can communicate via the serial data link. Diagnostic System Check - Horns
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Horns System Description and Operation.

Visual/Physical Inspection
Several of the symptom procedures ask for a careful visual/physical inspection. This step is extremely important, it could lead to correcting a problem without further checks and can save valuable time. These checks include the following:
- Inspect for aftermarket devices which could affect the operation of the Horn System. Refer to Checking Aftermarket Accessories Diagnostic Aids.
- Inspect the easily accessible or visible system components and harness connectors for obvious damage or conditions which could cause the symptom.

NOTE: Refer to Fastener Notice in Service Precautions.

- Perform the following if the horns buzz or have a harsh tone:
- Inspect for debris in the joints where the horns fasten 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).

Intermittents
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose a symptom that does not set a DTC:
- Horns Always On
- Horns inoperative
- Horns Inoperative - One Horn
- Horns - Poor Tone