See also:

Activating HDC
Press the button; the LED above the button lights up. ...

Controls on the interior rearview mirror
Controls on the interior rearview mirror ▷ LED, arrow 1. ▷ Buttons, arrow 2. ▷ The hand-held transmitter, arrow 3, is required for programming. ...

The concept
The system is functional at speeds beginning at approx. 20 mph/30 km/h. It maintains the speed that was set using the control elements on the steering wheel. The system brakes on downhill gradie ...