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Home >> Cadillac >> 2007 >> CTS Base, 3.6 7, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Digital Radio Poor or No Reception >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac SRX. 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 before using this diagnostic. Address any concerns with the OnStar® System prior to diagnosing or repairing the XM radio concern.
  1. Ignition OFF, disconnect the antenna coax from the digital radio receiver (DRR). Connect the EL-48028  to the DRR. See Special Tools .
  2. Turn the ignition ON, radio ON tuned to XM. Verify XM reception has improved.
    • If the reception is not improved, replace the DRR.
  3. Ignition OFF. Disconnect the DRR antenna from the coaxial cable. Test the resistance of the antenna coaxial cable center conductor from end to end. Verify the resistance is less than 5 ohms.
    • If the resistance is greater than 5 ohms, replace the antenna coaxial cable.
  4. Test the resistance of the antenna coaxial cable outer shield from end to end. Verify the resistance is less than 5 ohms.
    • If the resistance is greater than 5 ohms, replace the antenna coaxial cable.
  5. Test the resistance of the antenna coaxial cable between the center conductor and the outer conductor. Verify there is infinite resistance between both conductors.
    • If there is less than infinite resistance between the inner conductor and the outer conductor of the coaxial cable, replace the antenna coaxial cable. If the coaxial cable tests normal, replace the digital radio antenna.
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