SRS message in MB w211.
Child seat sensor under the front passenger seat needing replaced, or wired out so the computer wont get this error again. This is one of many big problems with W211 cars.
It can also be seatbelt problem, to much volt going in to the belt relay.
My W211 had have this SRS messeges many times.
1. stering clock damaged cousing SRS problem.
2. 14 days later one of seven computer damaged.
3. 7 months later SRS, Childseat sensor damaged or making error for no reason.
4 time five days ago SRS error again, passenger seat belt relay damaged, to much volts going in.
This doesn´t mean that SRS mean airbag, it can be all safety future with passenger safety like those a have had.
Hope this help even orginal post is 5 years old