Side airbag assembly

1. A restraint system comprising:

a seat including a seatback and a seat bottom extending from the seatback in a seat-forward direction;

a first airbag fixed to the seatback at a side of the seat and a second airbag fixed to the seat bottom at the side of the seat, the first and second airbags each inflatable to an inflated position; and

the second airbag in the inflated position overlapping the first airbag in the inflated position in a seat-rearward direction;

wherein the seatback is pivotable relative to the seat bottom between an upright position and a reclined position, the second airbag in the inflated position overlaps the first airbag in the inflated position when the seatback is in the upright position and when the seatback is in the reclined position.

2. The restraint system of claim 1 , wherein the first and second airbags are fluidly separated from each other.

3. The restraint system of claim 1 , wherein the second airbag in the inflated position extends in the seat-forward direction farther from the seatback than the first airbag in the inflated position.

4. The restraint system of claim 1 , wherein, in the inflated position, the second airbag abuts the seatback in the upright position and is spaced from the seatback in the reclined position.

5. The restraint system of claim 1 , further comprising an inflator supported by the seatback, the inflator is in fluid communication with the first airbag and the second airbag.

6. The restraint system of claim 5 , further comprising a fill tube assembly extending from the inflator to the second airbag, wherein the fill tube assembly extends along the seatback and the seat bottom.

7. The restraint system of claim 6 , wherein the fill tube assembly includes a fill tube and a cover enclosing the fill tube, the fill tube and the cover are flexible relative to the seat.

8. The restraint system of claim 6 , wherein the inflator initiates inflation of one of the first airbag and the second airbag prior to the other of the first airbag and the second airbag.

9. The restraint system of claim 1 , further comprising an external tether extending from the first airbag to the second airbag, the external tether fixed to the first airbag and the second airbag.

10. The restraint system of claim 9 , wherein at least one of the first airbag and the second airbag is disposed between the external tether and the seat.

11. The restraint system of claim 1 , wherein the seat has an occupant seating area, the first and second airbags are disposed outboard of the occupant seating area relative to the seat.

12. The restraint system of claim 1 , wherein the seatback includes a bottom at the seat bottom and a top spaced from the bottom, the first airbag is disposed closer to the bottom than the top of the seatback.

13. The restraint system of claim 12 , wherein the seat bottom includes a back end at the seatback and a front end spaced from the back end in the seat-forward direction, the second airbag is disposed closer to the back end than the front end of the seat bottom.

14. The restraint system of claim 13 , wherein the seat has an occupant seating area, the first and second airbags are disposed outboard of the occupant seating area relative to the seat.

15. The restraint system of claim 1 , wherein the seat bottom includes a back end at the seatback and a front end spaced from the back end in the seat-forward direction, the second airbag is disposed closer to the back end than the front end of the seat bottom.

16. The restraint system of claim 1 , wherein the seat is rotatable between a vehicle-forward position and a vehicle-rearward position.

17. The restraint system of claim 16 , further comprising a processor and a memory storing instructions to inflate the first and second airbags in response to detecting an impact when the seat is in the vehicle-forward position.

18. The restraint system of claim 1 , wherein, in the inflated position, the first airbag abuts the seat bottom when the seatback is in the upright position and is spaced from the seat bottom when the seatback is in the reclined position.

19. A restraint system comprising:

a seat including a seatback and a seat bottom extending from the seatback in a seat-forward direction;

a first airbag fixed to the seatback at a side of the seat and a second airbag fixed to the seat bottom at the side of the seat, the first and second airbags each inflatable to an inflated position; and

the second airbag in the inflated position overlapping the first airbag in the inflated position in a seat-rearward direction;

wherein the seatback includes a bottom at the seat bottom and a top spaced from the bottom, the first airbag is disposed closer to the bottom than the top of the seatback;

wherein the seat bottom includes a back end at the seatback and a front end spaced from the back end in the seat-forward direction, the second airbag is disposed closer to the back end than the front end of the seat bottom.

20. The restraint system of claim 19 , wherein the seat has an occupant seating area, the first and second airbags are disposed outboard of the occupant seating area relative to the seat.