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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B2485 >> Circuit/System Testing

Circuit/System Testing

  1. Verify that the T4S wireless communication antenna - Bluetooth ® is properly connected to the K73 telematics communication interface control module and is not damaged.
    • If the antenna is disconnected 

      Connect the T4S Bluetooth ® antenna to the module.

    • If the antenna is damaged 

      Test or replace the T4S Bluetooth ® antenna

    • If the antenna is connected and not damaged 
  2. Ignition ON.
  3. Verify DTC B2485 is not set.
    • If the DTC is set 
    1. Test or replace the T4S Bluetooth ® antenna.
    2. Clear the DTC, ignition OF.
    3. Ignition ON.
    4. Verify the DTC is not set.
      • If the DTC is set

        Replace the K73 telematics communication interface control module.

      • If the DTC is not set
    5. All OK.
    • If the DTC is not set 
  4. All OK.
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