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Symptoms - Horns: Notes

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The following steps must be completed before using the symptom tables:
  1. Perform Diagnostic System Check - Vehicle , before using the symptom tables in order to verify that all of the following are true:
    • There are no DTCs set
    • The control modules can communicate via the serial data link
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to Description and Operation .
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