Sup everyone,
I'm new here and this happend to me last week. I have a 2008 S550. I changed my rear battery and front sam module due to corrosion. The other day my alarm fob, headlights/tail lights, AC, windshield wipers, turn signal, horn, door locks, and power seats stopped working as if they aren't getting any power. The funny thing is that the dash illuminates and radio comes on, but gauges doesn't move showing fuel level. I checked all fuses? I can't fathom the idea that all these things stooped working @ the same time. Has anyone experience this before? What could it be?