Same problem with my 2006 4Runner
Hi there!
I had the same problem but unfortunately none of the methods in here worked for me. Appreciate everyone trying to help solve the issue and want to contribute my own experience and solution.
Vehicle: 2006 4Runner (this solution should work with any 4th Gen 4Runner)
Problem: Driver side rear passenger seat won't go up after seat top is folded down
Expected behavior: After folding seat top down, the whole seat should disengage and fold up and forward.
I basically ended up taking the entire seat apart as much as is possible without removing it entirely. The reason I couldn't remove it entirely is because there are 4 bolts at the front base of the seat, two of which are located under the seat itself and cannot be removed unless the seat is folded up and forward. After deconstructing as much of the seat as possible (without removing) it became apparent to me that even if I had removed the seat, that would not have been enough to unlatch the seat.
Deconstruction:
I removed the handle lever that is pulled to fold the seat. This is a very difficult part to remove while the seat is stuck in the down position. Access to the phillips screw that holds the handle on is very limited. The only reason I was able to remove it is because the screw was already loose. The screw is hidden by a snap on cover.
With the handle removed, I was able to remove the cover to the latch mechanism. Upon inspection I noticed there is a cable (similar to a bicycle brake cable) that was unseated from its bracket. I secured it back into its bracket but the seat still did not release. I then had to take apart the back plastic panel on the seat, doing so requires the seat cushion padding be released first. To do that you must first release the velcro flaps from the seat cushion to ease the tension. The seat cushion will then unlatch in the back by pushing the back flaps down toward the floor. Be careful, I didn't push it down at first and broke part of the plastic hook that holds it in place. Now with the back panel and back part of the seat cushion partially removed, I was able to expose enough of the mechanism that releases the back latches. There are two levers that get pulled by bicycle style cables. The lever near the middle of the seat can be accessed from above near the seat buckle with the seat cushion partially removed. The other lever mechanism located nearest the other back seat can be located from behind the seat near the base of the latch itself. You can stick a screw driver in there to push the levers and release the latch.
Function:
The back seat latch release is initiated by 3 contact points or junctions.
- Contact point (1) is located at the handle to release the seat. Two cables are pulled at this contact point, one cable releases the upper part of the seat. As the upper part of the seat folds forward, it tensions a lever that pulls a second cable. The second cable is for the two latches that secure the base of the seat - It pulls the lever at the next contact point (contact point 2).
- Contact point (2) is located at the side mid of the seat, beneath part of the yellow warning sticker at the base of the seat. This contact point is another lever that pulls a cable. This lever pulls the final contact point (contact point 3)
- Contact point (3) are the final levers that release the latches to the back seat, so technically there are 2 contact points here. Between contact point (2) and point (3) the cable splits into a Y. From here the two cables release the final latch mechanism that holds the seat down.
After releasing both latches and folding the seat up (at contact point 3), I was able to inspect how the whole thing works. Somehow the seat magically started to behave properly again, I was able to fold it down and latch it into place and then through normal means release the seat again. I did this many times and it was released normally every time. Something must have shaken loose or fallen back into place to make it behave normally again. But after spending a whole day getting it to work again, I decided never to go through all of this trouble again. The next part is not for everyone, but if you are like me and hold functionality above looks, then maybe its for you too. Or if you want an easy way to release the seat but don’t mind the cosmetics of it all, then read on.
The final Mod (function over looks):
I cut a hole on the bottom side cover of the seat in order to access Contact point (2). Pulling the lever at this point will release the back seat. If the seat ever gets stuck again, all I need to do is use my hand to pull this lever and release the seat.