The bags deploy on rapid decelleration that the sensors program tells them that the occupant will be thrown foward/at the dash, etc...hard enough to suffer serious or fatal injury.
An impact can be hard, but the truck not decelerated sufficiently, and the bags remain undeployed.
I've never sen an X's deploy, but I've seen plenty of others go off.
It takes a pretty good shot...I have seen some go off offroad, like coming down nose first off ledges, perhaps a 4'-6' drop, on Jeeps who forgot to pull the bag fuse before heading out, etc.
A free falling jeep, at 32' per sec2, for 6', would be going less than 22 mph...as it takes a second of fall to get to that speed...but the rocks below are not likley to cushion anything.
I would have thought a 15 mph impact would be enough, as I got 3/4 head on'd in a company car by a late for work nut job...I was going maybe 10 mph, the other car was going maybe 10 mph turning across oncoming traffic into my bumper to get into a bank entrance, that had I not been there, was already bocked by a camaro, which she also rammed...
:rolleyes:
So my bag went off, cracked one rib. Hers didn't, the camaro's did.
So it seems to be a crap shoot as to if they go off...but, in looking at the respective damage to each car, the deployments seemed to match the absorbed forces.
_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif