I spoke too soon. This morning: christmas tree dashboard, no communication from dashboard to DME, aircon started blowing hot air and idrive screen blinking. maybe there's more water under the carpet or I'm still not getting to the root of the problem. ugh.

Weird thing is I drove about 100 miles yesterday without issue, and we didn't have rain last night.

Battery was down to 12.3V... charged back up to 12.6 still having issues.

Ard perhaps I should listen to your advice and pull up the passenger seat and check the connections... a bad module wouldn't take the entire system down though, would it?