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It basically just unplugs and plug the new one in. Here is a picture of the location.
I was looking at the 2005 as this was the original posting I see the location on the 2005 is under the dash but I do not have instructions on how to change it. I will send your information to another expert for help.
Remove the trim panel under the steering wheel for easier access:
Disconnect the harness connector, loosen the locking nut and then unscrew the brake switch from bracket:
2003 Jetta left rear window blue plastic part of the