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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 257 (Theft Deterrent System) >> Diagnostic Information and Procedures >> Symptoms - Theft Deterrent >> Important Preliminary Checks Before Starting

Important Preliminary Checks Before Starting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. 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 .
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