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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B125C or B125D >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Check for the proper operation of the OnStar® System prior to performing this diagnostic. Address any concerns with the OnStar® System prior to diagnosing or repairing the XM radio concern.
  1. Ignition OFF, disconnect the DRR antenna coax from the radio. Connect the EL-48028  to the radio and place on the roof of the vehicle. See Special Tools .
  2. Ignition ON, radio tuned to XM. Verify XM reception has improved.
    • If the reception is not improved, replace the radio.
  3. Ignition OFF, disconnect the antenna coaxial from the digital radio antenna.
  4. Test for less than 5 ohms end to end at the coax center conductor.
    • If greater than the specified range, replace the antenna coax.
  5. Test for less than 5 ohms end to end at the coax outer shield.
    • If greater than the specified range, replace the antenna coax.
  6. Test for infinite resistance between the antenna coax center conductor and the outer shield.
    • If less than the specified range, replace the antenna coax.
  7. If all circuits test normal, replace the digital radio antenna.
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