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Home >> Cadillac >> 2008 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 284 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Digital Radio Poor or No Reception (with UYS) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the digital radio antenna coax cable from the A11 radio. Connect the EL-48028  Digital Radio Test Antenna to the radio and place on the roof of the vehicle.
  2. Ignition ON, radio tuned to XM channel 1.
  3. Verify DTC B125C is not set as current and XM reception is improved.
    • If DTC B125C is set as current or XM reception is not improved 

      Replace the A11 radio.

    • If DTC B125C is not set as current and XM reception is improved 
  4. Ignition OFF, disconnect the digital radio antenna coax cable from the T4G cellular phone, navigation, and digital radio antenna.
  5. Verify the digital radio antenna coax cable passes the coax cable component test. Refer to Component Testing.
    • If the coax cable does not pass the test 

      Replace the antenna coax cable

    • If the coax cable passes the test 
  6. Test or replace the T4G cellular phone, navigation, and digital radio antenna.
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