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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1258 (Instrument Panel, Gauges & Console) >> Diagnostic Information & Procedures >> Diagnostic System Check - Audible Warnings >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table:

  1. 2.  Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 3.  The Symptom list in SYMPTOMS - INSTRUMENT PANEL, GAGES & Console  will determine the correct diagnostic to use.
  3. 4.  The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
    4. Fig 1: Diagnostic System Check - Audible Warnings
    G02506237Courtesy of GENERAL MOTORS CORP.

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