Originally Posted by BenzRepair

I believe your remote system is fine (your lock and unlock signal verifies it); however, either your pump under the seat is bad, or the signal itself (I'm sorry to say likely to be the pump; that's assuming you already checked the fuse). Mechanical resistance on the driver door is likely a bad locking cylinder, unless the cylinder locking "finger" is stuck.

Your radio will need to be tested by a facility with the appropriate equipment to hook up to it, to eliminate some other expensive possibilities, I'm afraid.