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No (or Noisy) OnStar Audio

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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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