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Important Preliminary Checks Before Starting

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the Diagnostic System Check - Theft Deterrent  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 vehicle theft deterrent description and operation in order to familiarize yourself with the system functions. Refer to Vehicle Theft Deterrent (VTD) Description & Operation .
  3. Review the content theft deterrent description and operation in order to familiarize yourself with the system functions. Refer to Content Theft Deterrent (CTD) Description & Operation .
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