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 C350 SRS Light Due to Spilled Liquid on Buckles or Underneath Seat
Mercedes-Benz C350 Problem
Average Mileage: 79,731 mi (61,000 mi - 98,462 mi)
Visitor, 2006 Mercedes-Benz C350, 98,462 mi
Battery died and SRS light came on after installing new battery. NO idea why, there was no moisture or water under the seats.