System functions

PDC incorporates the following functions:

• Acoustic warnings
• Visual warning with multi-audio system controller and Car Communication Computer
• Check Control
• System limits

Acoustic warnings 

The acoustic warnings are emitted by:

> E70

• Mid-range loudspeaker with CHAMP, M-ASK or CCC

  If an object is detected by 2 ultrasonic sensors, the loudspeaker closest to the object is actuated.

  The mid-range loudspeakers can be actuated.

  (depending on the model concerned, the mid-range loudspeakers in the left/right front doors or left/right rear doors are actuated, for example)

  If an object is detected by the central ultrasonic sensors, the mid-range loudspeakers on the left and right-hand sides are actuated together.

  > E87, E90, E91, E92, E93

• 2 acoustic generators (1 front, 1 rear) with radio without audio system

  The PDC control unit directly actuates the acoustic generators (front/rear in vehicle interior). Within the acoustic generator, the control signal is transformed to approx. 48 volts. This voltage excites a piezo ceramic element that together with the resonator (housing) generates a warning tone.

  Up to 09/2006, the tone is in the frequency range of approximately 1 kHz.

  From 09/2006 the tone is in the frequency range of approximately 1.5 kHz (front) or 1.0 kHz (rear).

• Mid-range loudspeaker with RAD 2, M-ASK or CCC

  If an object is detected by 2 ultrasonic sensors, the loudspeaker closest to the object is actuated.

  The mid-range loudspeakers can be actuated.

  (e.g. the mid-range loudspeakers in the front doors, left/right, in the rear shelf, left/right, in the rear doors, left/right, in the rear shelf, left/right or in the rear side trim, left/right are actuated, depending on the vehicle model.)

  If an object is detected by the central ultrasonic sensors, the mid-range loudspeakers on the left and right-hand sides are actuated together.

  > R56

• 1 acoustic generator (rear) with Radio Wave

  The PDC control unit directly actuates the acoustic generators (in rear of vehicle interior). Within the acoustic generator, the control signal is transformed to approx. 48 volts. This voltage excites a piezo ceramic element that together with the resonator (housing) generates a warning tone. The tone is in the frequency range of approximately 1 kHz.

• Mid-range loudspeakers with Radio Wave CD, Radio Boost CD or CCC

If an object is detected by 2 ultrasonic sensors, the loudspeaker closest to the object is actuated. The mid-range loudspeaker on the left/right can be actuated.

If an object is detected by the central ultrasonic sensors, the mid-range loudspeakers on the left and right-hand sides are actuated together.

The distance to the object determines the tone sequence for the acoustic warning (the smaller the distance, the faster the tone sequence).

A distance of less than approx. 25 centimeters is indicated by a continuous tone. The continuous tone is emitted alternately from the front and the rear.

If the vehicle moves away from the object, the warning tone will be cancelled when the distance increases by more than 10 centimeters.

Effective range for acoustic warnings:

• approx. 60 centimeters for the ultrasonic sensors at the two corners of the front bumper
• approx. 70 centimeters for the two middle ultrasonic sensors in the front bumper
• approx. 60 centimeters for the ultrasonic sensors at the two corners of the rear bumper
• approx. 150 centimeters for the two middle ultrasonic sensors in the rear bumper