2009 Kia Sportage - Airbags and shaking

airbag light stays on
brakes work fine but at 70 mph front end shakes brakes were replaced 2 times with new pads and rotors about 12000 on new brakes when the problem starts happening?

This needs a hands on diagnosis.
Airbag problems should only be repaired by persons trained in those systems.
Brake problems can be from inferior parts or driving habits.