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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC B125C: Satellite Antenna Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF/Vehicle 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/Vehicle in Service Mode, 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.

    • Go to next step: If DTC B125C is not set as current and XM reception is improved 
  4. Ignition OFF/Vehicle OFF, disconnect the digital radio antenna coax cable from the T2RR Antenna - Roof Rear.
  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

    • Go to next step: If the coax cable passes the test 
  6. Test or replace the T2RR Antenna - Roof Rear.
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