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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Speaker Circuit Malfunction - without Amplifier

    NOTE:

    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 harness connector at the appropriate speaker.
  2. Radio ON, mute OFF, test for 5.0-7.5 volts between each audio signal circuit terminal 1 and terminal 2 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Insert the EL-50334-6 Audio Test CD from the EL-50334-50   EL-50334-50  USB Cable and Adapter Kit.
  4. Play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between each signal circuit terminal 1 and terminal 2 and ground.
    • If not the specified value, replace the A11 radio.
  5. If all circuits test normal, replace the speaker.

Speaker Circuit Malfunction - with Amplifier

    NOTE:

    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 X1 harness connector at the T3 audio amplifier.
  2. 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. Disconnect the X3 harness connector at the T3 audio amplifier.
  5. Ignition ON, radio ON, verify a test lamp illuminates between the remote enable signal circuit terminal 13 and ground.
    • If the test lamp does not illuminate, test the remote enable signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
  6. Radio ON, mute OFF, test for less than 1 V between the amplifier control circuit terminal 6 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  7. Test for 4-8 V between the audio signal circuit terminals listed below and ground.
    • Left front low level audio signal (+) terminal 9
    • Left front low level audio signal (-) terminal 1
    • Right front low level audio signal (+) terminal 10
    • Right front low level audio signal (-) terminal 2
    • Left rear low level audio signal (+) terminal 11
    • Left rear low level audio signal (-) terminal 3
    • Right rear low level audio signal (+) terminal 12
    • Right rear low level audio signal (-) terminal 4
    • If less than the specified range, test the signal 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 signal circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  8. Insert the EL-50334-6 Audio Test CD from the EL-50334-50   EL-50334-50  USB Cable and Adapter Kit.
  9. Mute OFF, play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground.
    • Left front low level audio signal (+) terminal 9
    • Left front low level audio signal (-) terminal 1
    • Right front low level audio signal (+) terminal 10
    • Right front low level audio signal (-) terminal 2
    • Left rear low level audio signal (+) terminal 11
    • Left rear low level audio signal (-) terminal 3
    • Right rear low level audio signal (+) terminal 12
    • Right rear low level audio signal (-) terminal 4
    • If not the specified value, replace the A11 radio.
  10. Ignition OFF, reconnect all harness connectors at the T3 audio amplifier.
  11. Disconnect the harness connector at the appropriate T19 speaker.
  12. Ignition ON, radio ON, test for 4-8 V between the appropriate speaker signal terminals listed below and ground:
    • Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (-) circuit terminal 1
    • Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (+) circuit terminal 2
    • Subwoofer speaker control (-) circuit terminal A
    • Subwoofer speaker control (+) circuit terminal B
    • 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.
  13. Mute OFF, play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground.
    • Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (-) circuit terminal 1
    • Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (+) circuit terminal 2
    • Subwoofer speaker control (-) circuit terminal A
    • Subwoofer speaker control (+) circuit terminal B
    • If not the specified value, replace the T3 audio amplifier.
  14. If all circuits test normal, replace the appropriate T19 speaker.
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