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Circuit/System Testing

WARNING: This page is about a different car, the 2020 GMC Acadia. 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 T2RR Antenna Roof - Rear and the A11 Radio.
  2. 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 
  3. Replace the T2RR Antenna Roof - Rear.
  4. Ignition ON, A11 radio ON, tune to digital band.
  5. Verify DTC B125B is not set as current and digital reception is improved.
    • If DTC B125B is set as current or digital reception is not improved 

      Replace the A11 Radio.

    • Go to next step: If DTC B125B is not set as current and digital reception is improved 
  6. All OK.
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