I'm NOT sure if this extends up to 2005, but in the mid-nineties on up, the common problem was the dome light switches.
They are not a "pin switch" visible sticking out of the door post for the door to hit when closed.
They are cleverly hidden inside the doors on the actual door latches.
They get dirt/moisture/road salt in them and slowly drain the battery.
If you pull the dome light bulbs the battery still drains because the switches stay powered up, connected to relay(s) and/or the GEM module.
If your 2005 is set up that way, the switches are very likely the problem.
I have replaces a number of them for customers, but on my old 1995 parts runner Exploder, I simply pulled the wire connecters off of all the switches, including inside the rear hatch.
Ended the problem, and the dome lights still work on manual.
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