GM Service Manual Online
For 1990-2009 cars only

Important: The following steps must be completed before using the symptom tables.

  1. Perform the Diagnostic System Check - Radio/Audio System before using the Symptom Tables in order to verify that all of the following are true:
  2. • There are no DTCs set.
    • The control module(s) can communicate via the serial data link.
  3. Review the system operation in order to familiarize yourself with the system functions. Refer to the following system operations:
  4. •  Radio/Audio System Operation
    •  Video System Operation

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the Entertainment System. Refer to Checking Aftermarket Accessories
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom.

    •  Radio Poor Reception
    •  Radio Controls Inoperative - Rear Seat
    •  Radio Display/Illumination Inoperative with Park Lamps On
    •  Rear Seat Audio Power Indicator Always On
    •  Steering Wheel Controls Inoperative
    •  Speakers Inoperative - One or More
    • For Video Entertainment System Symptoms, refer to Video System System Check .