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Test Description

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. 4.  The presence of DTC s which begin with "U" indicate some other module is not communicating on the class 2 serial data circuit. The specified procedure will compile all the available information before tests are performed.
Fig 1: Diagnostic System Check - Audible Warnings
G01779839Courtesy of GENERAL MOTORS CORP.
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