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HOMESERVICE MANUALSBUICK2019ENVISION BASEREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTINFOTAINMENTCELLULAR, ENTERTAINMENT, AND NAVIGATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1265CIRCUIT/SYSTEM TESTING
2019 Buick Envision Base

Circuit/System Testing

2019 Buick Envision BaseSECTION Circuit/System Testing
  1. Ignition OFF, radio OFF. It may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the X1 harness connector at the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
  3. Test for less than 10 Ω between the ground circuit terminal 8 and ground.
    • If 10 Ω or greater 
    1. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  4. Ignition ON, A11 Radio ON.
  5. Verify that a test lamp illuminates between the control circuit terminal 3 and ground.
    • If test lamp does not illuminate 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the A11 Radio.
    • Go to next step: If test lamp illuminates 
  6. Ignition OFF, radio OFF. It may take up to 2 min for all vehicle systems to power down.
  7. Test for less than 1 V between the control circuit terminal 3 and ground.
    • If 1 V or greater 
    1. Disconnect the harness connector at the A11 Radio, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A11 Radio.
    • Go to next step: If less than 1 V 
  8. Test or replace the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
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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.