On my 2009 Collins vans(GM chassis) the feed for the body control solenoid is under the drivers seat.Trouble is it is very poorly attatched to a mini fuse.I have had them become loose killing 12v power to the body control solenoid. When this happens, no warning lights, elec. door, heaters ..nothing!If you have these check them out.Affix the 12v feed better and you'll be ok.
Jim
