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Home >> Chevrolet >> 2021 >> Trailblazer L >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular, Entertainment, And Navigation >> Diagnostic Information and Procedures >> No Global Positioning System (GPS) Reception >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the GPS coax cable connector at the K73 Telematics Communication Interface Control Module.
  2. Connect the EL-49903  OnStar Antenna Diagnostic Tool Kit to the K73 Telematics Communication Interface Control Module. Place the test antenna on the roof of the vehicle, ignition ON.
  3. Verify DTC B2462 is not set.
    • If DTC B2462 is set 

      Replace the K73 Telematics Communication Interface Control Module.

    • Go to next step: If DTC B2462 is not set 
  4. Ignition OFF, disconnect the EL-49903  GM OnStar antenna diagnostic tool kit from the K73 Telematics Communication Interface Control Module
  5. Disconnect the K73 Telematics Communication Interface Control Module GPS coax cable at the T4E Cellular Phone and Navigation Antenna.
  6. Test the coax cable between the K73 Telematics Communication Interface Control Module and the T4E Cellular Phone and Navigation Antenna. Refer to component testing.
    • If the coax cable does not pass the test 

      Replace the coax cable.

    • Go to next step: If the coax cable passes the test 
  7. Test or replace the T4E Cellular Phone and Navigation Antenna.
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