The smart junction box is in the right side kick panel here are diagrams of the location. You may need to get it problems for about $130.00 at a shop but I have seen them plug and play as well. Check out the diagrams (Below) Please let us know what happens. Cheers. 05 Mustang Smart Junction Box. The Mustang series of junction boxes is a rugged industrial grade electrical connector that has been around since 1989. The box is available in a variety of configurations and offers high-quality connectivity in a compact size for use with the SMART System family of panels and modules.
Hey I litterally got my car back today from the same problem. Water leaked into the smart junction box 3 months ago and I finally saved up to spend $1000+ to buy a new SJB. But all I paid was $276 total and Ford dealership just recoded and installed software that was reset when the SJB(GEM Module) got wet.. This Video will show you how to replace your interior Fuse Box in your 05-09 Mustang (Also known as SJB-Smart Junction Box or Anti-Theft Fuse Box)How to tell.