2000 venture electrical issues

I have a 2000 chevy venture 152,000 miles. Still in pretty good mechanical condition!. Electrical issues are popping up though. The power rear vent windows will not close, the windsheild washer motor does not work and the auto passenger door will not open. All of these started at the same time,several months ago. Today the brake lights are not working but bulbs are ok. We checked all the fuses with a circuit checking thingy and they are all ok. Any suggestions on where to start checking next?

With my 97, I can only address your power door and brake lights not working issues. First, try the reset procedure for you power door listed in your owner's manual. If your third brake light works, but not the other two and if you are getting one or both of the ABS or TCS lights on your dash always staying on, you may have a short in the rear tailight supposed weatherproof plug. Please advise.