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Home >> GMC >> 2014 >> Terrain SLT, 4D Utility >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> Speaker Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Terrain and 2010 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Amplifier Circuit Malfunction

  1. Ignition OFF, disconnect the X3 harness connector at the T3 audio amplifier.
  2. Ignition OFF, test for less than 10 Ω between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, disconnect the X1 harness connector at the T3 audio amplifier.
  5. Connect a test lamp between the control circuit terminal 8 and ground.
  6. Ignition ON, turn the A11 radio ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
  7. If all circuits test normal, refer to Radio and Amplifier Output Circuit Testing.

Radio and Amplifier Output Circuit Testing

  1. Ignition OFF, disconnect the X1 harness connector at the T3 amplifier.
  2. Ignition ON, radio ON, test for 4-8 V between the control 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 3
    • Right rear speaker control (-) terminal 4
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
    3. 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.
  3. Insert the audio test CD from the J 39916-A  CD and Cassette Diagnostic Audio Kit. See Special Tools .
  4. Play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the control 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 3
    • Right rear speaker control (-) terminal 4
    • If not the specified value, replace the A11 radio.
  5. Ignition OFF, reconnect the X1 harness connector at the T3 audio amplifier.
  6. Disconnect the harness connector at the appropriate T19 speaker.
  7. Ignition ON, radio ON, test for 4-8 V between the appropriate control circuit terminals listed below and ground:
    • Door speakers, front tweeter speakers, or center I/P speaker: speaker control (-) circuit terminal 1
    • Door speakers, front tweeter speakers, or center I/P speaker: speaker control (+) circuit terminal 2
    • Left subwoofer speaker control (-) circuit terminal A
    • Left subwoofer speaker control (+) circuit terminal B
    • Right subwoofer speaker control (-) circuit terminal C
    • Right subwoofer speaker control (+) circuit terminal D
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the T3 audio amplifier.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the T3 audio amplifier.
    8. 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. Play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the appropriate control circuit terminals listed below and ground.
    • Door speakers, front tweeter speakers, or center I/P speaker: speaker control (-) circuit terminal 1
    • Door speakers, front tweeter speakers, or center I/P speaker: speaker control (+) circuit terminal 2
    • Left subwoofer speaker control (-) circuit terminal A
    • Left subwoofer speaker control (+) circuit terminal B
    • Right subwoofer speaker control (-) circuit terminal C
    • Right subwoofer speaker control (+) circuit terminal D
    • If not the specified value, replace the T3 audio amplifier.
  9. If all circuits test normal, replace the appropriate T19 speaker.
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