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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular Communication System >> Diagnostic Information and Procedures >> Diagnostic System Check-Cellular Communication >> Test Description

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 or a total malfunction of the class 2 serial data circuit. The specified procedure will determine the condition.
  2. 3. The presence of DTCs which begin with "U" indicate some other system control module is not communicating.
Fig 1: Diagnostic System Check - Cellular Communication
G01587312Courtesy of GENERAL MOTORS CORP.
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