The SRS (airbag) light can come on if liquids are spilled into the seat belt buckles, or if the liquid pools underneath the seat and gets into the electrical connector for the seat belt pretensioner. Damaged components will require replacement to restore proper airbag operation.Google+
Car Problem Reports
Mercedes-Benz C280 SRS Light Due to Spilled Liquid on Buckles or Underneath Seat
Mercedes-Benz C280 Problem
Dealer and independent mechanic said that the fix is very costly and they dont recommend it. They also say that even after the fix (new sensor, new wiring) there are no guarantees that the SRS light wont come on. And I thought Mercedes Benzs were cars that last. Not even 100,000 miles on the car.