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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 242 (Entertainment System) >> Diagnostic Information and Procedures >> Diagnostic System Check - Radio/Audio System >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. 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 will determine the correct diagnostic procedure 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.
Fig 1: Diagnostic System Check - Radio/Audio System
G02422451Courtesy of GENERAL MOTORS CORP.
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