how to turn off srs light

the srs light is on because there is a fault in the airbag system. you will need to have a good MB specialty shop diagnose this and find out what component has failed. until you get the repair done, you need to be aware that your airbag will likely not function in a severe crash. if you decide not to repair the malfunction, the srs light will stay on.

probably a crash sensor but you need code read, good engine anylizer can read it but not inexpensive hand held one