Water can damage the weight sensor in the front, passenger seat, causing the SRS (airbag) light to illuminate. There is an electrical component in the seat cushion susceptible to fluid damage. Any spills should be dried up immediately in order to try and prevent damage to the sensor.
Car Problem Reports
Mercedes-Benz E320 SRS Light Due to Water Damage on Passenger Seat Weight Sensor
Mercedes-Benz E320 Problem
Average Mileage: 70,000 mi (40,000 mi - 100,000 mi)
Visitor, 2003 Mercedes-Benz E320, 70,000 mi
SRS light omes on when startcar. If someone sets on seat and I go on a drive and have to stop and get out and restart car light may go out
Visitor, 2005 Mercedes-Benz E320, 100,000 mi
not fixed yet, just keep the seat belt buckled
Visitor, 2003 Mercedes-Benz E320, 40,000 mi
SRS Light on. Sensor changed.