I had to remove my entire interior a couple weeks ago. A tube fell off just above where the front passengers feet go. The tube leaked water into the entire car, then it sat at my office for 3 weeks. EVERYTHING was moldy. In any case, after reassembling everything I had one wire connector under the passenger seat that didn't seem to have a home. I'll attach a picture. I can't remember if it is extra, or supposed to be plugged into something.
Also, air bag light went on due to taking the seats out. Oops.