My '04 Pacifica comes quietly alive 10 minutes after it has been shut down for the night. The control panel for the HVAC lights up in a dull reddish glow and all the vents start opening and closing. Eventually, the cycle stops and the screen goes black, only to start again a few minutes later. This activity killed a marginal battery several times until I replaced it. One night, I sat in the car for awhile to find out the cause of the battery drain and discovered this clandestine activity.
Of special note, I can no longer select the desired venting. It gives me what it chooses, which can be especially troublesome if I need defrosting. Also, the windshield wipers have done some wacky routines and erratic behavior, occasionally going into full speed wipe for 6 or 7 sweeps when they are in intermittent mode. Also, I no longer have use of the power seats including the lumbar support, any movement or recline, or the seat heaters. This occurred one night when the driver's seat would not return from a reclined position using the door switch, but did respond to several clicks of the key fob. Once it was in position, I touched the door switch again and heard a "pop" from under the seat. The car then filled with the unmistakeable smell of an electronic burn-out.
I have been told that the body computer needs to be replaced, In fact, I have one on hold on e-Bay.
Please help me out a bit here. The dealer wants 180 dollars to go exploring.