I have a 2000 escalade. I have an intermediate problem with the power windows, radio and wiper that stops working at the same time.

I had the same problem... Its the bcm or body control module. Its located in your center counsole. At first I was able to fix mine by using a giant zip tie and securing the electrical connection into the bcm unit because it was just making a bad connection. That worked for about six months untill in completely stopped working and I bought a used one for 80 bucks.

Check your relay switched under the hood, Escalade relays known fry and burn up causing things like this. Flip open fuse box and the are 1 x 1" squares, usually light grey if they are factory. pull one out at a time and if you see any browning or yellowing that is probably what is happening. Pull it out run to a Napa or Auto Zone and for $15.99 replace and see if that fixes it for ya. Worked for me and my daytime running light issue.