is this a 78 450sl or an 88 560sl?trunk latch is mechanical with vacuum conn for lock.if you are trying to unlock make sure that you first turn key counter clockwise and then push button in.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg