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Home >> Cadillac >> 2019 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B2462 (without UE1/UI3, CW1) >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF/vehicle OFF, disconnect the navigation antenna coax cable connector at the K74 Human Machine Interface Control Module. Connect the EL-49903  GM OnStar antenna diagnostic tool kit to the K74 Human Machine Interface Control Module, place the test antenna on the roof of the vehicle.
  2. Ignition ON/vehicle in Service Mode, infotainment system ON, navigation selected.
  3. Verify DTC B2462 is not set or that the NO GPS symbol/message is not displayed on the radio display.
    • If DTC B2462 is set or the NO GPS symbol/message is displayed 

      Replace the K74 Human Machine Interface Control Module.

    • Go to next step: If DTC B2462 is not set or if the NO GPS symbol/message is not displayed 
  4. Ignition OFF/vehicle OFF, disconnect the radio navigation coax cable at the.
  5. Verify the radio navigation coax cable passes the coax cable component test. 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 
  6. Test or replace the T2RR Antenna - Roof Rear.
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