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Home >> Pontiac >> 2009 >> G8 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Speaker Malfunction >> Circuit/System Testing >> Amplifier Circuit Malfunction
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Amplifier Circuit Malfunction

WARNING: This page is about a different car, the 2008 Pontiac G8. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the audio amplifier.
  2. Ignition OFF, test for less than 10 Ω between the ground circuit terminals listed below and ground.
    • Terminal 5
    • Terminal 12
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ on the B+ circuit terminals listed below and ground.
    • Terminal 4
    • Terminal 11
    • If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Radio ON, test for 5.0-7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left rear speaker output (+) terminal 1
    • Left rear speaker output (-) terminal 6
    • Right rear speaker output (+) terminal 2
    • Right rear speaker output (-) terminal 7
    • 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.
  5. Ignition OFF, reconnect the amplifier and disconnect the appropriate subwoofer harness connectors.
  6. Radio ON, test for 5.0-7.5 V between the signal circuit terminal 1 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
    • 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 amplifier.
  7. Test for 5.0-7.5 V between the signal circuit 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 amplifier.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
  8. If all circuits test normal, replace the appropriate subwoofer.
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