Is it frozen from ice (i dont know where you live)
Do you use it regularlly?
Sorry for the delay,,,very busy with this crazy weather..
The reason i asked if it was used on a regular basis, is because unless its used ALL the time, rust will build up in the cable housing and it wont release,,,cable replacement is probably thew fix, sometimes you can lube the hell out of it with WD-40 and it will loosen, but that takes time and you probably want to drive it :-)
Here's what you can try,,,on the driver side, crawl underneath and grab the cable and pull real hard then let it "snap back",,,do this a few times and sometimes it will free up,,,other than that, its not an easy fix and you will have to resort to the wd-40 and let it soak for 1/2 hour or so, then try it again..you might be able to back off the adjuster for the rear cables, they split off right in that area i was talking about,,,driver side, about 2/3 of the way back from front.
If you have further questions on this, please feel free to reply.
Hey, if you still need to ask me some more questions, do it,,it wont cost extra :-)
This should help you see how it is routed.