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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Image Display Cameras) >> Diagnostic Information and Procedures >> DTC B1784 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the navigation antenna coax cable connector at the Vehicle Performance Data Recorder. Connect the EL-49903  GM OnStar antenna diagnostic tool kit to the K161 Vehicle Performance Data Recorder, place the test antenna on the roof of the vehicle.
  2. Ignition ON, infotainment system ON, Vehicle Performance Data Recorder selected.
  3. Verify DTC B1784 is not set.
    • If DTC B1784 is set 

      Replace the K161 Vehicle Performance Data Recorder.

    • Go to next step: If DTC B1784 is not set 
  4. Ignition OFF, disconnect the navigation antenna coax cable at the T15 Navigation Antenna Signal Splitter.
  5. Verify the 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 T15 Navigation Antenna Signal Splitter.
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