To allow for safer parking, proximity sensors can be mounted in the front or rear bumpers.
These color-matched sensors emit ultrasonic sound waves that the human ear cannot detect.
These piezo sensors are used to transmit and receive coded sound waves. The control unit determines the distance between the sensor and an obstacle by measuring the time taken for the sound wave to leave and return to the sensor. Normally 4 sensors are used to allow for full coverage across the width of the vehicle.
Proximity to obstacles can be indicated by separate audible and visual alarms, or by integrating warning sounds with the vehicle’s audio system.
If a trailer is attached to a coupling, the rear sensors are disabled automatically when the harness plug is inserted. Front sensors can be disabled manually in stop start or stop and go traffic.