See also:

Malfunction
Comfort Access may not function properly if it experiences interference from external sources such as mobile phones, metal objects, overhead power lines, transmission towers, etc. In this case, ...

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

Indicator/warning lamps
The indicator lamp flashes: DSC controls the drive forces and brake forces. The indicator lamp lights up: DSC has failed. ...