If your 2003 Volkswagen Jetta radio is not working, it could be due to a variety of reasons. Here are a few common causes and solutions
Loose or damaged wiring Check the wiring harness that connects the radio to the car’s electrical system. Make sure all of the connections are tight and secure. If any of the wires are damaged, you will need to replace them.
Blown fuse Check the fuse box for a blown fuse that could be preventing the radio from getting power. If you find a blown fuse, replace it with a fuse of the same amperage.
Bad radio If the radio itself is bad, you will need to have it repaired or replaced.