Hyundai: Question for Hyundai Tech

Any idea what the deployment speed threshhold is for the airbags, frontal
collision?

I don't have any such information. I'd figure around 20-30 MPH, but I
don't really know. Your best bet is in sales literature, but my guess is
that Hyundai doesn't even let this information out of Korea for liability
reasons. Technicians here in the U.S. have to sometimes fight for
information as to what is required to make a diagnostic trouble code set.