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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1639 (Theft Deterrent System) >> Diagnostic Information and Procedures >> Symptoms-Theft Deterrent >> Important Preliminary Checks Before Starting

Important Preliminary Checks Before Starting

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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 And 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 and Operation .
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