I had an SRS light on my '98 C230 about a year ago. Turned out that the pin connectors on the side airbag sensor (on the crossmember, beneath the seats) had rusted right off. Check yours, if not rusted right off maybe they could be cleaned to save some $.

Cheers,
Matt

__________________
next oil change -C230- 160000 Km
-Mustang- 70000 Km