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Home >> Cadillac >> 2007 >> XLR Base >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 13 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1025-B1125 >> Circuit/System Testing >> DTC Set By The Radio
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DTC Set By The Radio

WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the appropriate audio amplifier harness connector for the inoperative low level audio signal circuit.
  2. Ignition ON, radio ON, test for 5.0-7.5 volts between the appropriate low level audio signal positive (+) circuit 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. Ignition ON, radio ON, test for 5.0-7.5 volts between the appropriate low level audio signal negative (-) circuit and ground.
    • If less than the specified range, test the signal circuit for a short to ground or 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 audio amplifier.
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