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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Theft Deterrent System) >> Symptom Testing >> Symptoms - Theft Deterrent >> Important Preliminary Checks Before Starting

Important Preliminary Checks Before Starting

WARNING: This page is about a different car, the 2002 GMC Safari, 2002 Chevrolet Astro, 2001 GMC Safari, and 2001 Chevrolet Astro. 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 module(s) 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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