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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (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 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 and X2 harness connectors at the T3 audio amplifier.
  2. Test for less than 10 Ω between the ground circuit terminals listed below 8 and ground.
    • Terminal 8 X1
    • Terminal 12 X2 (UQS)
    • 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 X1 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 8 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 11 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 15
    • Left front low level audio signal (-) terminal 7
    • Right front low level audio signal (+) terminal 14
    • Right front low level audio signal (-) terminal 6
    • Left rear low level audio signal (+) terminal 13
    • Left rear low level audio signal (-) terminal 5
    • Right rear low level audio signal (+) terminal 12
    • Right rear low level audio signal (-) terminal 4
    • Center channel low level audio signal (+) terminal 3 (with UQS)
    • Center channel low level audio signal (-) terminal 2 (with UQS)
    • Subwoofer low level audio signal (+) terminal 1 (with UQS)
    • Subwoofer low level audio signal (-) terminal 9 (with UQS)
    • 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. 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. Insert the audio test CD from the J 39916-A  . See Special Tools .
  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 15
    • Left front low level audio signal (-) terminal 7
    • Right front low level audio signal (+) terminal 14
    • Right front low level audio signal (-) terminal 6
    • Left rear low level audio signal (+) terminal 13
    • Left rear low level audio signal (-) terminal 5
    • Right rear low level audio signal (+) terminal 12
    • Right rear low level audio signal (-) terminal 4
    • Center channel low level audio signal (+) terminal 3 (with UQS)
    • Center channel low level audio signal (-) terminal 2 (with UQS)
    • Subwoofer low level audio signal (+) terminal 1 (with UQS)
    • Subwoofer low level audio signal (-) terminal 9 (with UQS)
    • 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, 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
    • Rear Compartment or Subwoofer speaker control (-) circuit terminal A
    • Rear Compartment or 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. 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.
  13. Play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the appropriate speaker signal 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
    • Rear Compartment or Subwoofer speaker control (-) circuit terminal A
    • Rear Compartment or 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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