2000 retained accessory power problems

I have a 2000 Astro which has developed a problem with the retained accessory power. It started one day when my dome light would not go off after closing the door. I used the dome light overide button on by the headlight switch to turn the dome light off. I also started having problems with my power door locks, when I try to lock the doors all the doors lock but the driver's side it will lock then unlock making me lock the driver's door manually. Is there a schematic of the electrical system somwhere so I can track the problem down I do not want to carry it to a mechanic it seems like it should be easy to fix.