Hyundai Sonata: Airbag Module / Passenger Airbag (PAB) Module Description and Operation
		
		
		
Passenger Airbag (PAB) module is located in the passenger 
crash pad. This PAB contains 2 firing squibs of airbag and 1 firing 
squib of active vent. Depending of crash speed or the tightening of seat
 belt, it is decided a timing about both 2 firing squibs of airbag and 1
 firing squib of active vent. At the moment of vehicles collisions, the 
firing squib of active vent make airbag distended and then consecutively
 leaked gases of airbag through a hole at once. These operations reduce 
an injury of the passenger's head. At first, the active vent sets a 
rapid deployment of airbag by keeping the pressure, after deployment of 
airbag it emits the gases of upper airbag. The Working Principle of 
Tether Cutter: When receive an electrical signal, Tether Cutter cuts a 
strap which is been attached Active vent in order to open a hole of 
upper airbag.The working range of Active Vent
1) If occupant in passenger seat is not belted, active vent is disposed in the end of crash event regardless of crash severity.
2) If occupant is belted and crash severe enough to require 2
 stage passenger airbag deployment is occurred, active vent is activated
 to optimize occupant protection.
3) Low-Speed + Belted : Inflator of Primary Fire + 2 Stage & Active Vent disposal in the end of crash event.
| Never attempt to measure the circuit resistance of the airbag
 module (squib) even if you are using a specified tester. If the circuit
 resistance is measured with a tester, accidental airbag deployment will
 result in serious personal injury. | 
   Removal 
1.
Disconnect the battery negative cable and wait for at least three minutes before beginning work.
2.
Remove the driver airbag module from the steering wheel after pressing the snap  ...