Cadillac/Buick Reverse Radar Sensor 0263063978 Parking Sensor

Cadillac ATS, XTS, SRX and Buick LaCrosse, Regal models: reversing radar probes (OEM numbers 0263063978, 84711298) installed inside the rear bumper to send/receive ultrasonic signals and monitor rear obstacle distance for parking safety. Installation difficulty medium; labor about 30–40 minutes; requires removing inner bumper trim. If the reverse radar does not alert, false alarms persist, or one-side detection fails, the probe sensor is aging or damaged and should be replaced to restore function.