stereo/climate control
 

Hi,my stepson just purchased a 1991 ls 400. there seems to be a problem with the electrical system. There is no power to the stereo or the climate control I checked fuses all were fine.Someone said maybe if the battery was dead to long there was a code that had to be reentered at a dealer. I'm not sure if thats right though? The car did sit for 3 or 4 mos before he bought it. Also the power seats don't work. I dont think they would be related but i'm not sure.Anybody with any advice that has the time or has had similar problems i could sure use a starting point.thanks in advance