It's supposed to be activated by a weight sensor in the passenger seat. I think it's something like 60 pounds in the seat activates it. Although that's the passenger airbag itself...
As far as the light, the only idea I could think of would to be unsolder the lamp for that light... (I'm assuming it's a led or something... if it's one big display then I have no clue)...
Messing with air bag systems is generally frowned upon...
