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Test Description

The number below refers to the step number on the diagnostic table.

  1. 8:  If the remote radio audio output (-) circuit is shorted to voltage, then the vehicle communication interface module (VCIM) has been damaged and requires replacement.
No (or Noisy) OnStar Audio

Step Action Yes No
Schematic Reference: OnStar Schematics 
Connector End View Reference: Cellular Communication Connector End Views 
DEFINITION: This procedure is for diagnosing problems during OnStar® audio following a button press from the OnStar® button assembly.
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Turn the ignition ON, with the engine OFF.
  2. Turn ON the radio.
  3. Set volume to a comfortable level.
  4. Press the OnStar® Center Call button.
Can the Connecting to OnStar message be heard playing through the audio system at all?		 Go to Step 3  Go to Step 4 
3 Test the remote radio audio output (-) circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 11 
4 Does the radio mute once the OnStar® Call Center button is pressed? Go to Step 5  Go to Step 9 
5 Is any distortion heard? Go to Step 7  Go to Step 6 
6 Test the remote radio left audio signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 7 
7 Test the remote radio left audio signal circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 8 
8  Test the remote radio audio output (-) circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 11 
9
  1. Turn the ignition OFF.
  2. Disconnect the vehicle communication interface module (VCIM) connector C2.
  3. Turn the ignition ON, with the engine OFF.
  4. Turn ON the radio.
  5. Set volume to a comfortable level.
  6. Using a fused jumper, short the cellular mute signal circuit to a good ground.
Does the radio mute?		 Go to Step 13  Go to Step 10 
10 Test the cellular mute signal circuit for an open.
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
11 Inspect for poor connections at the harness connector of the VCIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
12 Replace the radio. Refer to Radio Replacement in Entertainment.
Did you complete the repair?		 Go to Step 14  -
13
IMPORTANT: Perform the OnStar® setup procedure.
Replace the VCIM. Refer to Communication Interface Module Replacement .Did you complete the repair?		 Go to Step 14  -
14 Operate the system in order to verify the repair.
Did you find and correct the condition?		 System OK Go to Step 2 
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