To see if the relay is stuck closed he can simply remove it and re-insert it a couple of times and see/listen to see if the clutch "clicks" when it's removed and inserted with the key off.
Automatic sliding doors that don't work properly often have a side effect of parasitic battery draw and that's why I asked. If the AC relay and the sliding doors are not it then you'll want to find what is drawing the current. There are lots of videos out there on finding parasitic amp draw. It's a bit of a methodical and meticulous, process but it can be done and at least isolated to a specific circuit that is causing it.