Body-mounted airbag above door opening

1. A vehicle comprising:

a first pillar and a second pillar spaced along a vehicle-longitudinal axis, the first pillar and the second pillar defining a door opening therebetween;

an airbag above the door opening in an uninflated position and inflatable across the door opening to an inflated position;

a cable above the door opening when the airbag is in the uninflated position, the cable extending across the door opening from the first pillar to the second pillar when the airbag is in the inflated position;

a pyrotechnic retractor below the airbag and the cable when the airbag is in the uninflated position, the pyrotechnic retractor being connected to the cable; and

a tether extending from the pyrotechnic retractor to the cable, the tether being connected to the cable.

2. The vehicle of claim 1 , wherein the pyrotechnic retractor is operatively connected to the cable to pull the cable downward during inflation of the airbag.

3. The vehicle of claim 1 , further comprising a second pyrotechnic retractor below the airbag and the cable when the airbag is in the uninflated position, the second pyrotechnic retractor being connected to the cable.

4. The vehicle of claim 3 , wherein the pyrotechnic retractor is fixed to the first pillar and the second pyrotechnic retractor is fixed to the second pillar.

5. The vehicle of claim 4 , further comprising a third pillar, the second pillar being between the first pillar and the third pillar, the second pillar and the third pillar defining a second door opening therebetween.

6. The vehicle of claim 5 , further comprising a third retractor fixed to the third pillar.

7. The vehicle of claim 1 , wherein the pyrotechnic retractor is fixed to one of the first pillar and the second pillar.

8. The vehicle of claim 1 , further comprising:

a removable door removably engaged with the first pillar and the second pillar; and

a controller programmed to:

deploy the airbag and the cable in response to a vehicle impact and absence of the removable door from the door opening; and

maintain the airbag in the uninflated position in response to certain vehicle impacts and presence of the removable door in the door opening.

9. The vehicle of claim 1 , further comprising a first track on the first pillar and a second track on the second pillar, the cable being movably engaged with the first pillar and the second pillar.

10. The vehicle of claim 9 , wherein the first track, and the second track are each elongated upright.

11. The vehicle of claim 1 , wherein the airbag includes an inflation chamber, the cable being external to the inflation chamber.

12. The vehicle of claim 1 , further comprising:

a third pillar, the second pillar being between the first pillar and the third pillar, the second pillar and the third pillar defining a second door opening therebetween; and

a second cable above the second door opening when the airbag is in the uninflated position, the second cable extending across the second door opening from the second pillar to the third pillar when the airbag is in the inflated position.

13. The vehicle of claim 12 , further comprising a second pyrotechnic retractor and a third pyrotechnic retractor below the airbag and the cable when the airbag is in the uninflated position, the second pyrotechnic retractor being connected to the cable and the second cable, and the third pyrotechnic retractor being connected to the second cable.

14. The vehicle of claim 13 , wherein the pyrotechnic retractor is fixed to the first pillar, the second pyrotechnic retractor is fixed to the second pillar and the third pyrotechnic retractor is fixed to the third pillar.

15. The vehicle of claim 1 , wherein the cable is in tension between the first pillar and the second pillar when the airbag is in the inflated position.

16. The vehicle of claim 1 , wherein the cable is directly connected to fabric of the airbag.

17. A vehicle comprising:

a first pillar and a second pillar spaced along a vehicle-longitudinal axis, the first pillar and the second pillar defining a door opening therebetween;

an airbag above the door opening in an uninflated position and inflatable across the door opening to an inflated position;

a cable above the door opening when the airbag is in the uninflated position, the cable extending across the door opening from the first pillar to the second pillar when the airbag is in the inflated position;

a pyrotechnic retractor below the airbag and the cable when the airbag is in the uninflated position, the pyrotechnic retractor being connected to the cable; and

a tether extending from the pyrotechnic retractor to the airbag.

18. The vehicle of claim 17 , wherein the airbag includes a loop and the cable extends through the loop, the tether extending from the pyrotechnic retractor to the loop.

19. A vehicle comprising:

a first pillar and a second pillar spaced along a vehicle-longitudinal axis, the first pillar and the second pillar defining a door opening therebetween;

an airbag above the door opening in an uninflated position and inflatable across the door opening to an inflated position;

a cable above the door opening when the airbag is in the uninflated position, the cable extending across the door opening from the first pillar to the second pillar when the airbag is in the inflated position;

a pyrotechnic retractor below the airbag and the cable when the airbag is in the uninflated position, the pyrotechnic retractor being connected to the cable; and

a first track on the first pillar and a second track on the second pillar, the cable being movably engaged with the first pillar and the second pillar.

20. The vehicle of claim 19 , wherein the cable is in tension between the first track and the second track when the airbag is in the inflated position.