A few hours ago I went to get in my car and found that I couldn't de-activate the alarm with my key (I have a 12/94 prod 540). The key worked alright less than an hour before but this time it was a no-go. I ended up having to pull the fuse for the anti-theft system (the one in front of the EBox under the rear seat on the driver's side) to get the friggin alarm to shut up;



(credit goes to shogun for posting these pictures in another thread)

My question is this, what will I need to do to get things back to normal? (replacing the fuse just sounds the alarm again) Is it usually just a low/dead battery in the key that's the problem or will I end up having to visit a dealer to get this straight?