GM Service Manual Online
For 1990-2009 cars only

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

  1. Perform the Diagnostic System Check - Vehicle , before using the Symptom Tables in order to verify that all of the following are true:
  2. • There are no DTCs set.
    • The control modules can communicate via the serial data link.
  3. Review the system operation in order to familiarise yourself with the system functions. Refer to Telematics Description and Operation .
  4. Refer to the following symptom list, this list will enable the user to verify the customer complaint and narrow it to its source.

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to Checking Aftermarket Accessories .
    • Inspect for 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:

    •  Telematics Call Center Remote Function Requests Inoperative
    •  Unable to Contact Telematics Call Center
    •  No or Noisy Telematics Audio
    •  Global Positioning System (GPS) Data Not Current or Inaccurate