Dear Doctor: The battery went dead on my 1998 Cadillac Seville. My local shop installed a new battery ($275) that they said is better than the original GM battery. When I got home I tried to lower my driver window but it did not work. I tried the other windows and they were dead. I went back to the mechanic and was told it needed a new computer for the driver’s door and because it’s a new computer it wouldn’t be compatible to the other door computers, and that I would need to do all the doors. What is your opinion? Jim
Dear Jim: When a battery goes dead in some late vehicles, such as your 1998 Cadillac, it can cause multiple electronic problems, including a loss of computer and modules that run the electronics. Both Alldata and Identifix have troubleshooting procedures. The use of a professional scan tool will be needed in order to check the system for fault codes. I find it hard to believe that there is a problem with the other three window motors and/or modules. A broken wire and/or faulty window switch are most likely the problem.