Electronically controlled deceleration
The electronically controlled deceleration (ECD) reacts to a demand from the Active Cruise Control (ACC).
When ACC requires deceleration, DSC responds by applying the disc brakes on all four wheels (maximum rate of deceleration 2.5 m/s2 ).
When the car is on a decent with the speed preset by the driver, ECD automatically applies the brakes in order to keep the car's speed constant at the preset value.
When the brakes are applied automatically in this way, the brake lights are activated in accordance with the requirements of road-safety legislation. The light module does not activate the brake lights unless the vehicle's rate of deceleration is greater than 1m/s2 . This prevents the brake lights from flickering on and off.
Trailer stabilizing control (only in conjunction with trailer module for E60 and E61)
Trailer stabilizing control detects when a trailer is rocking about its vertical axis. The system functions at a speed of about 65 km/h when the trailer socket is in use.
With the aid of the DSC sensors, Dynamic Stability Control (DSC) monitors the vehicle's yaw behavior. If the trailer's rocking motion exceeds the limit, the engine output is reduced. In addition, DSC brakes all four wheels automatically.
If DSC is deactivated or faulty, then the trailer stabilizing control does not work either.
Tyre defect indicator
The Run Flat Indicator (RPA) is not a function of the Dynamic Stability Control system.
RPA is integrated into the DSC control unit as the four wheel speed signals are required for this function.
By comparing the speed signals for all four wheels, the system detects differences in rolling circumference at the individual wheels. This enables the system to recognize a sudden loss of pressure in the tires.