I saw a thread a while back that said this problem can be cured by cleaning the micro switches in the seat belt latches. I think it was on Jim F's page. You might want to search around first! Ahhh, here it is:

http://pages.prodigy.net/jforgione/MB_srs_sbs.html

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles