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Home >> GMC >> 2016 >> Terrain SL, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Speaker Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 GMC Terrain and 2015 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
    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.

  1. Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
  2. Test for less than 10 Ω between the ground circuit terminal 8 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. 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.
    • 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 and the circuit fuse is good 
    1. Ignition OFF.
    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.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the T3 Audio Amplifier.
    • If the test lamp illuminates 
  4. Ignition OFF, disconnect the X1 harness connector at the T3 Audio Amplifier.
    5. 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.

  5. Verify a test lamp does not illuminate between the control circuit terminal 8 and ground.
    • If the test lamp illuminates 
    1. Disconnect the X1 harness at the A11 Radio.
    2. Verify a test lamp does not illuminate between the control circuit and ground.
      • If the test lamp illuminates, repair the short to voltage on the circuit.
      • If the test lamp does not illuminate, replace the A11 Radio.
    • If the test lamp does not illuminate 
  6. Ignition ON, A11 Radio ON.
  7. Verify a test lamp illuminates between the control circuit terminal 8 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF. Disconnect the X1 harness at the A11 Radio.
    2. 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.
    • If the test lamp illuminates 
  8. Radio ON, mute ON.
  9. Test for 7.5-8.5 V between the control circuit terminal 16 and ground.
    • If greater than 8.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio. Ignition ON.
    2. Test for less than 1 V between the control 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.
    • If less than 7.5 V 
    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.
      • 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 between 7.5-8.5 V 
  10. Radio ON, mute OFF.
  11. Test for less than 1 V between the control circuit terminal 16 and ground.
    • If greater than 1 V 

      Replace the A11 Radio.

    • If less than 1 V 
  12. Test for 5-7 V between the signal circuit terminals listed below and ground:
    • Left front speaker control (+) terminal 11
    • Left front speaker control (-) terminal 12
    • Right front speaker control (+) terminal 9
    • Right front speaker control (-) terminal 10
    • Left rear speaker control (+) terminal 1
    • Left rear speaker control (-) terminal 2
    • Right rear speaker control (+) terminal 4
    • Right rear speaker control (-) terminal 3
    • If less than 5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • 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 X1 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.
    • If between 5-7 V 
  13. Play track number three (50 Hz bass test tone) from the EL-50344-6  Audio Test CD.
  14. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground:
    • Left front speaker control (+) terminal 11
    • Left front speaker control (-) terminal 12
    • Right front speaker control (+) terminal 9
    • Right front speaker control (-) terminal 10
    • Left rear speaker control (+) terminal 1
    • Left rear speaker control (-) terminal 2
    • Right rear speaker control (+) terminal 4
    • Right rear speaker control (-) terminal 3
    • If not between 49-51 Hz AC 

      Replace the A11 Radio.

    • If between 49-51 Hz AC 
  15. Ignition OFF, connect all harness connectors.
  16. Disconnect the harness connector at the appropriate P19 Speaker. Ignition ON, A11 Radio ON.
  17. Test for 5-7 V between the appropriate control circuit terminals listed below and ground:
    • Door speakers or front tweeter speakers: speaker control (-) circuit terminal 1
    • Door speakers or front tweeter speakers: speaker control (+) circuit terminal 2
    • Center I/P speaker: speaker control (-) circuit terminal 1 (with UZ8)
    • Center I/P speaker: speaker control (+) circuit terminal 2 (with UZ8)
    • Left subwoofer speaker control (-) circuit terminal A (with UZ8)
    • Left subwoofer speaker control (+) circuit terminal B (with UZ8)
    • Right subwoofer speaker control (-) circuit terminal C (with UZ8)
    • Right subwoofer speaker control (+) circuit terminal D (with UZ8)
    • If less than 5 V 
    1. Ignition OFF, disconnect the X2 harness connector at the T3 Audio Amplifier.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • 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 T3 Audio Amplifier.
    • If greater than 7 V 
    1. Ignition OFF, disconnect the X2 harness connector at the T3 Audio Amplifier. 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 T3 Audio Amplifier.
    • If between 5-7 V 
  18. Mute OFF, play track number three (50 Hz bass test tone) from the test CD.
  19. Test for 49-51 Hz AC between the appropriate control circuit terminals listed below and ground.
    • Door speakers or front tweeter speakers: speaker control (-) circuit terminal 1
    • Door speakers or front tweeter speakers: speaker control (+) circuit terminal 2
    • Center I/P speaker: speaker control (-) circuit terminal 1 (with UZ8)
    • Center I/P speaker: speaker control (+) circuit terminal 2 (with UZ8)
    • Left subwoofer speaker control (-) circuit terminal A (with UZ8)
    • Left subwoofer speaker control (+) circuit terminal B (with UZ8)
    • Right subwoofer speaker control (-) circuit terminal C (with UZ8)
    • Right subwoofer speaker control (+) circuit terminal D (with UZ8)
    • If not between 49-51 Hz AC 

      Replace the T3 Audio Amplifier.

    • If between 49-51 Hz AC 
  20. Test or replace the P19 Speaker.
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