Hi everyone, it's a long time since the last post on this, but I just wanted to share some info- because after 10 years I have fixed one of my tilting seats (I've joined specifically to share this because I'd love someone else to get the benefit of having their rear seats back).
My car is an 03 reg. The drivers seat tilt mechanism broke a decade ago and the passenger seat went last year.
I've had the covers up and found I have two different problems- the good news on the driver's seat first . . .
Having fixed the problem I can now see the answers above are saying very much the same thing, but hopefully anyone who like is finding it hard to visualise the problem will get something out of this.
The side of the seat that is nearest the window has a fastener that looks much like an allen key (you'd never guess I'm not a mechanic). This was out of its socket, hence why the lever on that side could easily be flicked up and down with a little finger! It's not possible to see the hole it should fit into, you have to feel for it with your fingers. If you look closely here there is also a small plastic clip that goes around the 'allen key'- a sort of pincer shape, this should attach around the 'key' and it also was loose. You have to do it blind of course but after a bit of wiggling around the key part will fit into its correct hole, then keep the seat very still and you can manoeuvre the pincer clip under and round- so that it grips round the 'key' and holds it firmly in place. I did this an hour ago and I've moved it up and down A LOT and it works great!
The other side unfortunately has a different problem- everything is in place and all the wires are connected, but it is only when I push the lever (just by handbrake) manually that the seat will tilt forward. If I have any success with this I'll be sure to let you know.
Fingers crossed my first problem is the same for you too and you should be able to solve it as above!