What does it mean when the Civic displays 'Check Rear Radar Sensor'?
3 Answers
The Civic displaying 'Check Rear Radar Sensor' likely indicates that one of the radar sensors is not functioning properly. You can turn the key to the second position, shift into reverse, and walk around the radar sensors to identify which one isn't responding by sound. Function of radar sensors: Radar sensors use Frequency Modulated Continuous Wave (FMCW) radar to detect moving or stationary targets. Even under extreme weather conditions, low-frequency radar can clearly detect high-dielectric objects such as cars, trains, trucks, and cargo. In most outdoor applications, high-frequency radar can detect a wider range of objects and is more powerful than ultrasonic sensors. Radar sensors are ideal for collision avoidance in mobile equipment like reach stackers, forklifts, mining vehicles, as well as port machinery such as transport vehicles, loaders, and handling devices. T30R series radar sensors: The T30R sensor is a long-range alternative to ultrasonic sensors, providing more reliable detection and positional feedback in extreme outdoor conditions and other challenging environments. Compared to traditional 24GHz radar sensors, it features a shorter blind zone, higher accuracy, and the ability to detect targets across a wider range.
When the Civic displays the warning to check the reverse radar sensors, it usually indicates an issue with the reverse system. This warning primarily checks whether your radar probes are functioning correctly. If left unrepaired, you might not hear the alert tone while reversing, increasing the risk of scraping objects. Common causes include the probes being covered by mud, dust, or water droplets, blocking the sensing; or the sensors themselves may be damaged due to aging or impact; there could also be loose wiring or a fault in the vehicle's control module. I've encountered this a few times myself—initially thinking it was minor, but later almost hit a wall while reversing. I recommend first cleaning the probes with a damp cloth to see if the warning clears. If it persists, don’t ignore it—visit a professional repair shop promptly, as malfunctioning radar can be quite dangerous, especially when parking at night. Regular maintenance of the probes to prevent dirt buildup and cautious driving can help avoid such issues.
I just bought this Civic not long ago, and a warning popped up in the car about checking the reverse radar sensors. I panicked immediately because it helps avoid collisions while reversing. It means the radar system might be malfunctioning, commonly due to the sensors being covered by dirt or snow and unable to detect; it could also be due to loose connections or damaged sensors. Last time, I tried wiping the sensors with a soft cloth myself, and the warning light went off, saving me repair costs. However, if the light stays on after cleaning, it's best to take it to the dealership for diagnosis—don’t mess with the wiring. Small issues like this shouldn’t be ignored, or reversing safety becomes a problem. I’ve even experienced a scrape due to radar failure, which was a big hassle. Make it a habit to clean the sensors during car washes, and you’ll stay much safer.
