I have just had a c class auto 200cdi 2004 converted with hand controls, one of the main reasons i got this one was front and rear parktronic ! So my dismay to find its not working, :fail, it goes into have star this Thursday hopefully shine some light on where problems is. One small problem I'm having also, hoping someone has an Answer is, in the boot there is a cross member running under parcel shelf, it has 2 black plastic plugs about 12cm x 6cm with spring mechanism behind them? wondering what they are for? ( seem to go into rear seat top) thought at 1st it maybe for auto head rests, however they do not appear to move when i press switch.