When I got my 97 PA there were codes, some stuff acting like yours in some instances.
I had few fuses that were questionable, one was the power accessories plug in up front and I used a VOM to test each fuse under rear seat & up front. Replaced the AC relay module as well. Even though I had 14.5 volts going into the Delco battery at idle....
I load tested the Delco 800cca battery at a local service centre that had a Midtronics Hand held load tester..my battery read low on voltage and was down to 480cca CCA .
I replaced the battery with the best, an Odyssey AGM type and all is well again.
The PK Ave has tons of lights on, just when u open the doors, and constant drains, so I felt it important to use a high capacity like the odyssey that keeps the headlights burning bright in most conditions. Everything seems to work better and faster (windows) with this battery and I do not seem to suffer the glitches like I use to. In other words these types of cars need a good battery and charging system, otherwise things can sometimes get real strange with a weakening battery or charging system.
When it is cold out...
A real CCA Battery makes a real difference!
Never get corrosion on terminals again with this absorb glass matt sealed battery!
New clean cables ensure power gets delivered properly.
Let there be real strong power!