Download 2019 Honda CR-V Backup Sensors Access User’s Information Manual – How the Backup Sensors Work Backup Sensors The sensors are ready for operation when the backup sensor switch is turned to ON and the shift lever is moved to Reverse. The sensors operate by emitting ultrasonic waves. They calculate the distance between each sensor and a detected object by measuring the time it takes for the ultrasonic waves to reach the sensor after being reflected by the detected object.
The sensors are designed to beep when the rear bumper is approaching a detected object. May not detect an object, if the distance from the corner sensor or center sensor to the obstacle is less than 20 cm (0.7 ft). The sensors detect the closest object. The sensors may not detect taller vehicles or objects. While driving in Reverse and towing, the system will beep. When this occurs, turn the backup sensor switch to OFF.