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HOMESERVICE MANUALSBUICK2019ENVISION BASEREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTINFOTAINMENTCELLULAR, ENTERTAINMENT, AND NAVIGATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESONSTAR AUDIO MALFUNCTIONCIRCUIT/SYSTEM TESTING
2019 Buick Envision Base

Circuit/System Testing

2019 Buick Envision BaseSECTION Circuit/System Testing
  1. Ignition OFF/vehicle OFF, and all vehicle systems OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module, ignition ON/vehicle in Service Mode.
  2. Test for less than 4 V between each of the signal circuits listed below and ground:
    • Terminal 1
    • Terminal 2
    • If 4 V or greater 
    1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON/vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuits and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less then 1 V, replace the A11 Radio.
    • Go to next step: If less than 4 V 
  3. Ignition OFF/vehicle 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.

    • Go to next step: If infinite resistance 
  5. Disconnect the X1 harness connector at the A11 Radio.
  6. Test for less than 2 Ω 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 2 Ω or greater 

      Repair the open/high resistance on the circuit.

    • Go to next step: If less than 2 Ω 
  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.

    • Go to next step: If audio is heard clearly 
  9. All OK.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.