ok so here are the 3 spots that we always check after a battery replacement and a issue like yours. sometimes a big prefuse blows, there is a box in the rear near the battery and a box under the passenger side front carpet and also the round plate has fuses that allow the battery power transfer from the alternator and starter and front battery.
so you want to make sure power is transferring through that plate as well.
do not try the reset procedure above it will cause you more issues. that rarely fixes an issue.
also you have 3 normal fuse boxes, 2 in the engine bay and one in the right rear storage box where the back seat would be.
its worth it to test for power at these fuse boxes because all the power wires from the prefuse boxes are what feeds power to these smaller fuse boxes.
you will most likely find a blown fuse.
let me know if you need additional help I am the best mercedes tech you will find.
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