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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and vehicle systems OFF, disconnect the harness connector X1 at the A11 radio and disconnect the harness connector X2 at the K73 telematics communication interface control module, ignition ON.
  2. Test for less than 1 V between the K73 telematics communication interface control module signal circuit terminal 1 and ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  3. Test for less than 1 V between the K73 telematics communication interface control module low reference circuit terminal 2 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  4. Ignition OFF.
  5. Test for infinite resistance between the K73 telematics communication interface control module signal circuit terminal 1 and ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  6. Test for infinite resistance between the K73 telematics communication interface control module low reference circuit terminal 2 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  7. Test for less than 2 Ω between the K73 telematics communication interface control module signal circuit terminal 1 and the A11 radio cellular telephone voice low reference circuit terminal 20.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  8. Test for less than 2 Ω between the K73 telematics communication interface control module low reference circuit terminal 2 and the A11 radio low reference circuit terminal 6.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  9. Replace the K73 telematics communication interface control module.
  10. 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 
  11. All OK.
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