Passenger seat belt will not release from the retracted position in my 2000 z3

You can't it is not designed that way. The seatbelt mechanism is damaged and needs to be replaced.

of course it possible to access this retractor , you just need to locate the small round circles in the lower part of trim and gently pry the covers off , screws will be evedent , you will need a 6 mm star (five sided) drive socket wrench to remove the retractor though

Not quite sure what you mean by got around passenger seat. But if the seat is blocking the belt from retracting, then you only need to unbolt the seat from the floor enough to manipulate the belt around the seat. Or just completely unbolt it all the way, you just need a 14mm deep socket and a ratchet. But if you mean the belt just won't retract, then you'll need a new retractor assembly. I hope this info helps!

The safety belts are sensible to release speed (u have to release it kinda smooth).Also they are sensibile to car inclination (lean) may not release whel when rise/fall position.If locked,u may have to shake a little the belt so the locking spring/balls to unlock.Eventualy ,when driving it can release by itself.One thing is for shure:no sudden moves:it locks again (as in the impact scenario)Cheers

The reason is the belt mechanism is damaged and the belt needs to be replaced. What happens is the gears lock this usually only happens when the vehicle is in a collision or has a major and hard stop

The problem:
The set belt stop has been lost so the seat belt retracts too far when the seat is laid flat. When laid flat the release mechanism lock as it should when not level. So the seat cannot be raised up as the belt is too tight and locked.
The Solution:
1) Push the two little clips to release and remove the headrests.
Pull the grey lever on the right of the seat base, lift seat base up and forward toward the front seat..
2) See two red capped leversat the back of the two seat hinges and lever them to the upward position, this releases the seat.
Rock the very heavy seat unit upwards and lift complete unit upwards.
3) Take it out of the car and turn 180% so that the back of the seat and base are in the upward position and the seat belt will pull out as it should
4) Replace the missing belt locking stop (I used a tie pin permanently fixed using super glue).
5) Fold seat back down and test then either re-fit seat unit or leave out to decrease fuel consumption..

There is a sensor right at the bottom of the seat belt, that sensor works hand In hand with the airbag sensor. The solution is to replace the whole belt

if you take the bolt out of the top of the seat belt you should be able to free it up it needs to roll back a bit before it will release

Your 1991 model Accord has automatic front retracting shoulder belts and, more than likely, the power retractor motor has gone bad on the passenger side front. If the shoulder seat belt is not in the retracted position, up close against the seat, when the car is running, the seat belt light will stay lit on your dash. Have the seat belt motor inspected and replaced if necessary.

I just solved the problem for a stuck rear center seat belt in my 2002 Jetta.

Flip the base seat cushion forward against the front seat backs. Trace down along the belt to its tether point on the floor. The belt is sewn around a steel loop. The loop is anchored to a black steel hook. A thin silvery retainer plate is spring tensioned on top of the loop to prevent it from sliding off of the hook when the seat back is folded.

Therefore, you need to press the silvery retainer plate away from the hook (push up) to allow the loop to be slid from the hook. The belt was tight with the seat back in the upright position, so it was necessary to fold the seat back forward to create slack in the belt. Now push the belt loop towards the trunk and slide it off of the end of the hook (only possible with the retainer plate pushed up out of the way).

Now with total release of tension on the system via the bottom end of the seat belt being untethered and with the seat back returned to the upright position, normal extension and retraction of the belt will be reestablished. Next, simply extend the seat belt and slide the loop back into place over the floor hook. It snaps past the silvery retainer plate without all the effort required to hold the plate up during removal of the loop during disassembly.

Check again, the seat belt should be extending and retracting properly. Now just put the seat cushion back into regular position and you will be able to safely buckle up three people across the back seat.

It took about as long to do this repair as it has taken to post this answer to the problem. Note, the seat belt safety mechanism only allows normal extension and retraction of the belt when the seat back is upright.