Gonna throw 'One More Hat Into This Ring' by suggesting that the Electric Seats may also come into play if any structural Stamped Steel Seat Framing sections Fracture or Collapse and then put *random* Crushing or Contact Pressure, Slicing actions or Shorting Wiring on the under-carriage Harnessing, Wire Bundles and on the Interior of Side Panel Switches or their Logic Boards contacts inside.
Unfortunately as this may become the Very Last Place to LOOK for the cause of this Trouble, the ONLY way to investigate much of this is to unwind the E-Torx Four Corners Fasteners, remove the Seat(s) and then REALLY examine everything underneath there... Up Close with a Bright Flashlight for ANY signs of Squashed Insulation or Disturbed GM OEM Taped sections demands a closer inspection.
The Electric Seats are one of those
"Hot At All Times" places that gets subjected to an
enormous amount of Physical & Dynamic Stressing and Strains. These are the places that have always escaped the imagination of GM Engineers in designing Under-Seat Harnessing in a manner that does not invite susceptibility to Parasitice Drain Problems.
The Basics for New Thread Readers:
Having any "Sketchy" Movement in your Electric Seat Slide Rack...?
@Mooseman 's [Solved!] Investigation of a "Stuck Electric Seat Switch" in His Saab causing a Nuisance Parasitic Drain:
So the Saab has cost me a few bucks with a new alternator and battery and it keeps dying in a week or so. So I've got a parasitic draw. Using the multimeter to measure amps, I'm getting a 1.27A draw. Quickly found that my ScanGauge II left plugged into the OBD port would draw over 1.1A and it...
gmtnation.com
And in this Example, a Shorted Wire inside the Driver's Side Door Hinges: