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Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Speaker Malfunction (without UQA) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.

One Speaker

    NOTE:

    Some circuits supply audio signals to more than one speaker. It may be necessary to disconnect all speakers on the affected audio circuit when performing circuit tests.

  1. Ignition OFF, disconnect the harness connector at the appropriate P19 Speaker. Ignition ON, A11 Radio ON, mute OFF.
  2. Test for 5 - 7 V between each audio signal circuit terminal 1 and terminal 2 and ground.
    • If less than 5 V 
    1. Ignition OFF, disconnect the appropriate harness connector at the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
    2. Test for infinite resistance between the appropriate signal circuits 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 signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
    • If greater than 7 V 
    1. Ignition OFF, disconnect the appropriate harness connector at the K108 Active Noise Cancellation Module / T3 Audio Amplifier. Ignition ON, A11 Radio ON, mute OFF. Test for less than 1 V between the appropriate signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
    • Go to next step: If between 5 - 7 V 
  3. Ignition OFF, disconnect the appropriate harness connector at the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
  4. Ignition ON, A11 Radio ON, mute OFF. Test for 5 - 7 V between each appropriate audio signal circuit from the A11 Radio and Ground.
    • If less than 5 V 
    1. Ignition OFF, Disconnect the appropriate speaker harness connector at the A11 Radio.
    2. Test for infinite resistance between the signal circuits 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 signal 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.
    • If greater than 7 V 
    1. Ignition OFF, disconnect the appropriate speaker harness connector at the A11 Radio. Ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A11 Radio.
    • Go to next step: If between 5 - 7 V 
  5. Test or replace the P19 Speaker.

All Speakers

  1. Ignition OFF, disconnect the X1 harness connector at the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
  2. 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 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate 
    1. Remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • Go to next step: If the test lamp illuminates 
  4. Ignition ON, A11 Radio ON.
  5. Verify that a test lamp illuminates between the control circuit terminal 3 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X2 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 the test lamp illuminates 
  6. Test for 5 - 7 V between any audio signal circuit from the A11 Radio and Ground.
    • If not between 5 - 7 V 

      Test or replace the A11 Radio.

    • Go to next step: If between 5 - 7 V 
    7. NOTE:

    In the following tests, audio signal frequencies (Hz) will be tested. To prevent misdiagnosis, the door chime must be OFF during testing. Ensure the driver door latch is closed during testing.

  8. Mute OFF, play any track from the test CD. Take note of the frequency (Hz) of the test track selected.
  9. Test for the corresponding Hz AC between the signal circuit and ground.
    • If not the corresponding Hz AC 

      Replace the A11 Radio.

    • Go to next step: If the corresponding Hz AC 
  10. Replace the K108 Active Noise Cancellation Module / T3 Audio Amplifier.
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