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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module, ignition ON.
  2. Test for less than 4V between each of the signal circuits listed below and ground:
    • Terminal 1
    • Terminal 2
    • If 4V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON.
    2. Test for less than 1V between the signal circuits and ground.
      • If greater than 1V, repair the short to voltage on the circuit.
      • If less then 1V, replace the A11 Radio.
    • If less than 4V 
  3. Ignition OFF.
  4. Test for infinite resistance between each of the signal circuits listed below and ground:
    • Terminal 1
    • Terminal 2
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Disconnect the X1 harness connector at the A11 Radio.
  6. Test for less than 2Ω in each of the signal circuits listed below end to end:
    • K73 Telematics Communication Interface Control Module Terminal 1 X2
    • K73 Telematics Communication Interface Control Module Terminal 2 X2
    • If 2Ω or greater 

      Repair the open/high resistance on the circuit.

    • If less than 2Ω 
  7. Replace the K73 Telematics Communication Interface Control Module.
  8. Verify that the Connecting to OnStar® message is heard clearly through the audio system when the OnStar® blue button is pressed.
    • If audio is not heard clearly 

      Replace the A11 Radio.

    • If audio is heard clearly 
  9. All OK.
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