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No (or Noisy) OnStar Audio

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.
No (or Noisy) OnStar Audio

Step Action Yes No
Schematic Reference: OnStar Schematics 
1 Did you perform the OnStar® Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Cellular Communication 
2
  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the radio.
  3. Set volume to a comfortable level.
  4. Activate the OnStar® Call Center button.
Does "Connecting to OnStar®" play through the audio system?		 Go to Step 11  Go to Step 3 
3 Tune the radio to a known good station.
Can the audio be heard through all speaker channels?		 Go to Step 4  Refer to DIAGNOSTIC STARTING POINT - ENTERTAINMENT
4 Does the audio system mute? Go to Step 6  Go to Step 5 
5 Test the entertainment and comfort serial data circuit for an open or a short. Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 11  Go to Step 8 
6 Test the remote playback device audio common signal circuit for short, an open or high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
7 Test the remote playback device right audio signal circuit for short to ground, an open or high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 11  Go to Step 8 
8 Test the remote playback device left audio signal circuit for short to ground, an open or high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS .
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
9 Inspect for poor connections at the harness connector of the vehicle interface unit (VIU). Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS .
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
10
IMPORTANT: Perform the OnStar® setup procedure.
Replace the VIU. Refer to OnStar Vehicle Interface Unit (VIU) Replacement .Did you complete the repair?		 Go to Step 11  -
11 Operate the system in order to verify the repair.
Did you find and correct the condition?		 System OK -
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