Right front passenger seat back is in full recline mode - will not return to upright position.

If it's binding the circuit breaker will shut off the recline motor. You have to replace the entire back frame to replace the motor

Question edited for full 'make model (what it is)'.
Question moved from Spanish car company Seat pronounced See-At.

It sounds like a broken return spring. Contact them with a view to a warranty repair or purchasing the part.

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Not sure if you can. Was the motor not operating? Shoot 12 volts to it through jumper wires, see if that helps.

return the seat to store for warranty

Regarding the passenger seat, to allow someone into the back seat, push the seat back lever DOWN. This will flip the back of the seat forward and allow the seat to slide forward. Simply push firmly on the seat back (no need to touch the lever) and it will return to its original position.

If you pull the seat back lever UP, you can adjust the recline angle of the seat back. Pulling the lever UP will also let you fold the seat and slide it forward, however, it will not return to its original position.

Sorry, cannot solve your airbag question.

I just encountered this problem with my 2000 Ford Excursion. After fighting with it for several hours I realized that the section of the seat that is facing up towards the roof of the vehicle was applying pressure to the back of the seat that was facing down and preventing the back of the seat from coming up when I pulled the lever. So, the next time I pushed the seat up that is facing the roof while I pulled the lever and this resovled my problem.

On W-Body vehicles, the front seats are secured to the floorpan by two front hook attachments and two rear bolts installed to nuts welded to the floorpan.
The manually operated two-way front adjusters provides only fore and aft movement of the seat. When the seat adjuster handle located on the front seat is pulled up, the seat adjusters unlock, permitting travel of the seat. When the seat is in the desired position and the seat adjuster handle is released, the seat locks in place.
A power operated six-way seat adjuster is available. The adjusters are activated by three 12 volt, reversible, permanent magnet motors with a built-in circuit breaker. The motors are energized by a switch bolted on the seat side panel.
The three motors drive the front seat and rear vertical actuators and a horizontal actuator. When the adjusters reach the limit of travel, torque is absorbed through the rubber mounted grommets located between the motor and the support. An overload relay is provided in the circuit and will open should excessive stall be applied.
The optional 60/40 split bench front seats have seat back head restraints on the driver's and passenger's seat back. The head restraints are designed so they cannot be removed from the seat back without first inserting a small rounded tool inside the head restraint support tube to release the locking tab. The 60/40 split bench seat is equipped with a reclining mechanism on both the driver's and passenger's side. The recliner lever is located on the outboard side of the spring cushion. When the lever is pulled upward, the spring loaded dual linear reclining unit located in the cushion frame is released, allowing the seat back to be pushed rearward or allowing the spring loaded reclining unit to bring the seat back forward.
Bucket seats are equipped with manual reclining mechanisms. An optional six-way power seat adjuster is available. Some bucket seats are equipped with inertia seat back locks. This system allows the seat back to fold forward without requiring the occupant to release a locking lever or access to the rear seat area. During a sudden stop or deceleration, or if the front of the vehicle is nose down, the inertia system of the seat back lock will engage, holding the seat back in its rest position. A release lever is provided to allow manual release of the seat back lock when the vehicle is in the nose down position. The release lever is located at the lower rear outboard corner of the seat back.
Some W-Body vehicles (notably Pontiac coupes) have passenger front seats equipped with an E-Z Entry device. This is actuated, in an unoccupied seat, by completely folding the seat back forward disengaging the adjuster, and sliding the front seat forward to gain access to the rear seat area. To return the seat to its normal position, return the seat back to its rest position, and slide the entire seat rearward, engaging the adjuster.
W-Body rear seats are available in several styles including a rear seat with an integral child restraint device.

the gear broke or the bar inside is broken,take it to a body shop and have them dis -assemble the covering on the rear of the seat then you can see the problem

I would first check the fuse panel & see if fuse is burned out. The next thing I would check is the switch, wiggle it sideways, etc to see if the contacts are dirty. Last, these motors sometimes go bad, as mine did, so I got another seat for $50 at the wrecking yard & just exchanged it. There is also a slight possibility that the wire harness came unplugged under the seat or at the switch, but that is pretty remote. Rick

check the adjusting bar on the pass. door side of seat.