Mercedes airbag life=15 years.
Your car: 1989
Current year: 2005
~15 years, yes?

That is why the SRS light is coming on. Dealer must inspect / replace bags.
Or you can remove light bulb.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro