Cadillac Buick GM Reverse Radar Probe 84540979 Electric Eye Sensor Replacement

If your Cadillac or Buick reverse radar beacon continuously chirps, or shows no alert or false obstacle readings (e.g., shows obstacle when none present), the rear parking radar probe (sensor eye) may be aging or internal components failing. This sensor works by ultrasonic detection of rear obstacles and provides real-time feedback on the instrument panel or buzzer; replacement with OEM 84540979 ensures electrical protocol compatibility and detection accuracy for Cadillac XT5, XT6, Buick GL8, LaCrosse and other models. When installing, always disconnect vehicle power and ensure the sensor clip aligns with bumper holes to avoid false alarms from misalignment.