I'm not a tech, but it sounds like a wire is not hooked up or a relay or fuse has a problem.
Have you checked your fuses and or relays?
If you were working on the engine, did you unplug anything and forget to hook it back up?
Hope that helps,
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.