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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1146 (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 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the XM™ radio antenna coax from the radio receiver. Connect the test antenna.
  2. Turn the ignition ON, radio ON tuned to XM. Is the reception improved?
    • If the reception is not improved, replace the radio.
  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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