Battery drains overnight on 2005 saturn relay

SOURCE: The HVAC fan on my 2005 Saturn Vue won't turn off.

relay may be sticking. may call your dealer and see if there are any service bulletins pertaining to this problem

SOURCE: removal of 2005 Saturn Relay DVD player

when you flip it down look up between the display and the front there are screws in there

SOURCE: Power windows wont open on 2005 Saturn Vue

This is probably the first thing you checked, but the window lock button isn't depressed is it? Assuming it's not locked.. have you checked wiring at the master switch? I don't have a wiring diagram handy but there should be two thick wires, one should have 12v with the key on, and the other should have a constant ground. If either is missing look further into the wiring, possibly a broken wire in the door jam, corroded connection somewhere else etc. If you have good power and a good ground the next place to look is the master switch. If you can figure out which wires coincide with which window switch, back-probe the wires with a digital multimeter. While operating the switch monitor the voltage, you should have -12 or +12 volts, depending on which way you have the leads hooked up. If the switch has power and a ground but isn't outputting the correct power and ground then the switch is bad and needs to be replaced.

SOURCE: 1997 deville, battery drains overnight,pin

I've replaced several rear body control modules that go bad and drain the battery. It is located behind the seat, black box about 4" x 5" rectangle. You can use a hand held scanner to diagnose them, the ones I replaced did throw a code. It is complicated and you need a pinout chart to diagnose it with an ohm meter. The ones I got were new and ran around $350.00