Sound signals
When the distance to the object behind is dangerously reduced, a periodic sound signal is given. As you get closer, the frequency of the signal increases, and when there is less than 30 cm to the obstacle, the sound becomes continuous.
Signaling stops after three seconds if the vehicle is moving (e.g. parallel to the wall) there is no approach to the obstacle.
A malfunction in the system is indicated by a continuous high tone sounding when the system is turned on. In this case, contact a BMW workshop for troubleshooting.
The presence of the PDC system does not relieve the driver from the need to independently assess the distance to obstacles. Objects that fall into the dead zone of the sensors are not recognized by the system and do not trigger an alarm. Object recognition can also go beyond what is physically possible with ultrasonic measurements, for example with drawbars and trailer hitches, as well as thin objects and varnished surfaces.
Loud sound sources such as a radio can drown out PDC signals.
To maintain the full functionality of the sensors, they should be kept clean and de-iced. It is unacceptable to hit the sensors with jets of steam for a long time. In this case, the distance should not be less 10 cm