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Home >> Buick >> 2018 >> Enclave Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1025, B1035, B1045, or B1055: Audio Output Circuit Short >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Without Amplifier without UK6

  1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
  2. Radio ON, test for 5.0 - 7.5 V between the signal circuit terminal A 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. Test for 5.0 - 7.5 V between the signal circuit terminal B 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.
  4. If all circuits test normal, replace the speaker.

Without Amplifier with UK6

  1. Ignition OFF, disconnect the X2 harness connector at the Auxiliary Radio/HVAC Control.
  2. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left Rear Low Level Audio Signal (+) - terminal 1
    • Left Rear Low Level Audio Signal (-) - terminal 2
    • Right Rear Low Level Audio Signal (+) - terminal 3
    • 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 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. Ignition OFF, reconnect the X2 harness connector at the Auxiliary Radio/HVAC Control. Disconnect the harness connector at the appropriate speaker.
  4. Radio ON, test for 5.0 - 7.5 V between the signal circuit terminal A 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 for front speaker circuits, replace the radio; for rear speaker circuits, replace the auxiliary radio/HVAC control.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal for front speaker circuits, replace the radio; for rear speaker circuits, replace the auxiliary radio/HVAC control.
  5. Test for 5.0 - 7.5 V between the signal circuit terminal B 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 for front speaker circuits, replace the radio; for rear speaker circuits, replace the auxiliary radio/HVAC control.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal for front speaker circuits, replace the radio; for rear speaker circuits, replace the auxiliary radio/HVAC control.
  6. If all circuits test normal, replace the speaker.

With Amplifier UQG without UK6

  1. Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) - terminal 5
    • Left front low level audio signal (-) - terminal 13
    • Right front low level audio signal (+) - terminal 6
    • Right front low level audio signal (-) - terminal 14
    • Left rear low level audio signal (+) - terminal 7
    • Left rear low level audio signal (-) - terminal 15
    • Right rear low level audio signal (+) - terminal 8
    • Right rear low level audio signal (-) - terminal 16
    • 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. If all circuits test normal, replace the audio amplifier.

With Amplifier UQA/UQS without UK6

  1. Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal 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
    • 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. If all circuits test normal, replace the audio amplifier.

With Amplifier UQG with UK6

  1. Ignition OFF, disconnect the X2 harness connector at the Auxiliary Radio/HVAC Control.
  2. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left Rear Low Level Audio Signal (+) - terminal 1
    • Left Rear Low Level Audio Signal (-) - terminal 2
    • Right Rear Low Level Audio Signal (+) - terminal 3
    • 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 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. Ignition OFF, reconnect the X2 harness connector at the Auxiliary Radio/HVAC Control. Disconnect the X3 harness connector at the audio amplifier.
  4. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left rear low level audio signal (+) - terminal 7
    • Left rear low level audio signal (-) - terminal 15
    • Right rear low level audio signal (+) - terminal 8
    • Right rear low level audio signal (-) - terminal 16
    • 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 auxiliary radio/HVAC control.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the auxiliary radio/HVAC control.
  5. Test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) - terminal 5
    • Left front low level audio signal (-) - terminal 13
    • Right front low level audio signal (+) - terminal 6
    • Right front low level audio signal (-) - terminal 14
    • If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  6. If all circuits test normal, replace the audio amplifier.

With Amplifier UQA/UQS with UK6

  1. Ignition OFF, disconnect the X2 harness connector at the Auxiliary Radio/HVAC Control.
  2. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left Rear Low Level Audio Signal (+) - terminal 1
    • Left Rear Low Level Audio Signal (-) - terminal 2
    • Right Rear Low Level Audio Signal (+) - terminal 3
    • 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 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. Ignition OFF, reconnect the X2 harness connector at the Auxiliary Radio/HVAC Control. Disconnect the X3 harness connector at the audio amplifier.
  4. Radio ON, test for 5.0 - 7.5 V between the appropriate signal circuit terminal listed below and ground.
    • 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
    • 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 auxiliary radio/HVAC control.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the auxiliary radio/HVAC control.
  5. Test for 5.0 - 7.5 V between the appropriate signal circuit terminal 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
    • If less than the specified range, test the appropriate 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 appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  6. If all circuits test normal, replace the audio amplifier.
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