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Test Description

The number(s) below refer to the step number(s) 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 will determine the correct diagnostic procedure to use.
  3. 4.  The presence of DTCs which begin with "U" indicate that loss of Class 2 communications has occurred.
    Fig 1: Diagnostic System Check - Head Up Display
    G01721657Courtesy of GENERAL MOTORS CORP.
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