I'm not sure off hand my w124 used to do the same the thing and I would usually get it to go by cycling the key and using the seat switch.

http://www.ps2cho.net/downloads/MB%20CD/W124/w124CD1/Program/ETM/24911000.pdf

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1999 E300DT (131,800) 154,000 Black on Black SOLD

2006 CLK 500 coupe Capri Blue on Grey (zoom,zoom)
47,000mi

04 VW TDI Passat 80,000mi
(Techno)

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