One problem related to battery has been reported for the 1999 Oldsmobile Aurora. The most recently reported issues are listed below.
I own a 1999 Oldsmobile Aurora and have noticed the passenger floor accumulating large amounts of water. When I removed the rear seat ( which is where the battery and other electricial wires are located ) the battery compartment is full of water, along with the rear floor board. It has not rained so I'm not sure where the water has come from or how long it has been there. I cleaned the water out, but it has since come back in a very rapid time frame. If you could please contact me it would be great. . Oldsmobile has no information on this for me.