Basic information
1. To facilitate parking, BMW 3 Series vehicles are equipped with a system that informs the driver of the distance between the rear of the vehicle and any obstacle behind the vehicle. The system consists of several ultrasonic sensors mounted on the rear bumper that measure the distance between the bumper and the nearest obstacle. Information about this distance is transmitted to the driver in the form of a sound signal. The smaller the distance to the obstacle, the higher the signal frequency becomes. If the distance becomes less than 30 cm, the signal becomes constant
System control unit
Withdrawal
2. In models "sedan" And "coupe" remove the right luggage compartment trim panel (see chapter 11, paragraph 27).
3. In the model "tourist" lift the luggage compartment floor panel. Loosen the nut and remove the spare wheel cover. Unscrew the two fastening nuts and remove the panel located between the spare wheel and the rear seat (pic. 26.3).
4. In all models, disconnect the wiring connectors from the unit, remembering their location. Loosen the mounting screws and remove the control box (pic. 26.4, a, b)
Installation
5. Installation is carried out in sequence. reverse withdrawal.
Ultrasonic sensors
Withdrawal
6. Remove the rear bumper (see chapter 11).
7. Disconnect the sensors wiring connectors, disconnect the clamps and remove the sensors from the bumper.
Installation
8. Installation is carried out in the reverse order of removal