See also:

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

2009 BMW X3 Review
There is very little about the 2009 BMW X3 that hasn't already been covered by Cars.com; the 2007 model that Kelsey Mays reviewed is essentially the same vehicle that's offered for 2009. What has ...

HDC Hill Descent Control
The concept HDC is a downhill driving assistant that automatically controls vehicle speed on steep downhill gradients. Without applying the brakes, the vehicle moves at slightly more than walking ...