Hi,
My D2 seat issues started the same as yours. The bottom of the “60” seat wouldn’t click into the floor fully and therefore the seat back wouldn’t go more than halfway back up. I managed to get the base to lock in with a bit of physical encouragement, but then the back wouldn’t fix in the upright, locked, position as per my original message.
If you’ve forced the back into the upright position its possible that the square section rod that connects the three locking latches along the back edge of the seat bottom may have been damaged - if you remove the plastic cover on the door side of the seat you’ll see the cable and wheel which connect to the release latch on the top of the seat back. In the middle of the wheel connected to the release cable you’ll see the square section rod protruding into a square receiving hole in the wheel. Make sure you haven’t rounded off this section.
If you can still lift and tilt the seat base, then remove the trim covers and you should be able to see the three locking levers moving backwards and forwards as you pull the seat back release catch on the seat top. As long as they’re moving then I think your seat is still okay. If its not locking then you might want to try fishing around for those bits of flaking / split black plastic as per my original message.
If the three locking levers don’t move when you lift the release catch then you should check the cable is still okay and that the tension spring near the cable end isn’t too loose.
If you still can’t get the levers to move then it might be time to look for a replacement rear seat from a breakers / eBay. I’ve seen plenty come up, you just need to get lucky with the trim spec and condition. I’ve tried to get into the seat but after taking a few tork screws out I got nowhere, so quickly backed out of that approach.
I have a few more photos but my seat is now back together - sorry. The three additional photos below: the first of the whole seat back, the second of the middle locking lever, and the third of the way I found to keep the release cable pulled whilst I fished around for the troublesome bits of plastic!
Hope this helps.
Rob
View attachment 276290 View attachment 276291 View attachment 276292