How do i release stuck c4 seat runners

flip the 40 side forward, then release the seat back on the 60 side so you can get behind the seat. Place a small shaving mirror on the floor under the latch and use a screwdriver to push the latch up. After the seat released you find out that there were 2 latches on the 60 side, and the one over by the 40 side must have been caught on something. You should now open and close the seat a couple of times.

the lever activates cables to either side of the seat runners
one side has broken or come off
reach under the seat (from the back gives the most space and replace or re-clip that cable to the bar

need to check under the seat or even remove the seat if you cant see the problem. there is a wire that breaks connecting the two rail releases. find the wire and reconnect it

check for the release wire fully releasing the lock on that side. when you pull on the release lever it is to pull both release locks so the seat will move.

If the latch releases on both sides, then it may be jammed sideways just enough to hold it from sliding. Check if the seat sits evenly on the runners-move the left side back and forth to get the right side sliding. You may have to get a screwdriver or prying tool under the latch on the right runner, to make sure it releases fully. If it is a wire from the lever to the right latching tab on the runner, they get easily stretched.

on the 99 the front seats are identical. assuming there was little change in 2000 you unbolt both seats and move the passenger seat over to the driver side. while it is out, you set the sliders manually to be in the middle position and the passenger seat will be stuck there. If you can get light up inside there you will see a cable connector has released at one end meaning it will not release the dog to permit sliding so you may have to pull it manually with a vise grip in order to move the seat forward on the sliders to get at the bolt heads in the rear. unplug the battery before you unplug the seats.

Try pushing back as you work the switch forward and backward. The most likely problem is a stuck runner. Remove the two front bolts and the two rear nuts from the seat legs and tilt the seat backwards to clean and lubricate the runners

No, you would have to remove the seat completely any way.

Move seat all the way back, remove bolts
Move seat all the way forward, remove bolts
Tilt the seat forward to unplug any connectors

The seat position is changed through the use of a cable that runs through a flexible tunnel, under the seat. In one case that I'm aware of, this cable got stuck around a projecting seat spring under the seat. When the seat was reclined and moved backward or forward, the cable caught on the seat spring and the seat had insufficient slack in the cable to release from the reclined position.

so after completely tearing the seat apart I found 2 wires going up to the seat belt mechanism from under the seat, these wires got caught in the seat mechanism underneath and were shredded. There must be a small solenoid inside the seat belt mechanism because I could hear it click after I repaired the wires(this circuit is live even with the ignition off) Im not sure how it all works but this solved my problem.