[mirage335]

Tried putting the seat upright, no change, as described previously, things still don't work.

I might try to get a new computer module. The seat belt on this chair seems somewhat messed up, as if the belt tensioner has gone off. Maybe a new computer won't 'remember' to lock out stuff like seat tilt.

EDIT: Managed to get tilt barely working by using better gator clamps. Seems electrical resistance is a big thing.

EDIT: Nope, the tilt won't go back the other direction now. Still broken.