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Hello. First time on this Forum. I was told that my SJB is bad by someone who looked at my car due to my tail lights and license plate light suddenly stopped working. Breaks, signals, and front lights, all interior stuff all still work. New bulbs put in everything and fuses checked and replaced as needed. I don't trust the place that worked on my car, so I would like to know if the overall sjb is bad, how do other things continue to work? Does the sjb only control the back tail lights?? What are all the things it does control? I don't want to spend the money to replace this if I don't have to. Please help if you can. Thank you.