Is the indicator lamp blinking and if so does it blink slowly or rapidly? Rapid blinking indicates a problem with the trunk lid or luggage cover(possibly not closed properly?) and slow blinking indicates a general malfunction within the system. Gilly had a good suggestion about checking to make sure the unlocking mechanism was folded up after top was opened and extended upward for 20cm(important to push front of top up before operating switch). I had a recent problem lowering my top at a stop light when I drifted forward at maybe 1/2 MPH and the top stopped in the middle of opening. I had to stop, put car in park, turn key off/on and operate the switch. It worked after that. Good luck.

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2002 500SL(Black/Black)
1992 300SE(Black/Black)
1992 190E 2.3(White/Navy)
1999 VW Jetta TDI(Pearl Green)
1986 SAAB 900 Base 3 door(White)
1983 Porsche 911SC(Chiffon)
1977 VW Scirocco(DiamondSilver)