by Trail X » Thu Feb 21, 2013 10:22 am
It's probably the glass lock that is activating and deactivating. I haven't looked nor thought much of it before, but mine seems to have some sort of lockout functionality for the glass section, so it cannot be opened while the liftgate is open. Of course, I'm going from recollection here, but I seem to recall it making some sort of lock noise after the tailgate is lifted a few inches. Whatever sensor it's getting it's signal from is where I'd begin my check.
Odd indeed.