Hey how are you
What we need is Star Mercedes Scanner to retrieve fault codes ,the SRS air bag should not make it no start ,most likley the anti theft is triggered on .
Most likley you do not have that scanner available ,lets try a Master Reset first and we go from there ,
But yes that is true on scanner you need the dealer scanner to program the air bag and air bag module i believe you meant not fuse box :) to get it programmed
Master reset Procedure
1- Disconect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if battery cables don't reach .
2- Hold cables Together for 60 secs ,then let go
3- Wait 15 minutes
4- Make sure all doors are closed
5- Reconnect battery Cables
6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)
7- Enter the vehicle and attempt to start
Please let me know
ASE Certified Technician