Questions like this are asked and answered all the time here. There are specific items that are required replacement items when a deployment occurs or when an airbag light comes on...and there are some items that are "check only". Check out this website for the EXACT answers to your questions including fault code charts. This site tells you exactly what needs to be replaced and how to access them (seat belts & all) on over 3500 cars. It's a pay site, but it's little money well spent to get the correct answers and to see exactly what you're after...it uses pictures, not text, so you can see what you're looking for.
http://www.airbagsolutions.com
http://www.airbagsolutions.com/demo.aspx
http://www.airbagsolutions.com/vehicles_list.aspx
Good Luck...it's not too bad of a job & if your state allows it, used parts or parts from eBay should be ok
Here's a site that will explain everything you need to know about airbag lights and resetting the system.
http://www.airbagsolutions.com/
This website gives you the procedure for diagnosing and resetting airbag lights. See if your car is listed here.
http://www.airbagsolutions.com/vehicles_list.aspx
On a 2004 GMC truck, the airbag module is located underneath the carpet at the foot of the driver's seat. It can be accessed by pulling out the driver's seat.
The 1999 Honda Accord airbag computer module can be found behind the kick plate. The module will be on the passenger side.
The airbag module is the blue module box under the dashboard near the feet of the driver.
The 2002 Acura airbag control module is located on the firewall in the engine compartment. The airbag control module will be on the drivers side of the firewall.
The keyless entry module on a1998 Honda Accord is located underneath the dashboard. It is housed on the driver-side the of dash close to the main relay.
The driver's side airbag module is in the center of the steering wheel If it has a front pasenger airbag the module is in the right side of the instrument panel.
I have a 2001 s-10 ext cab with 60-40 front seats. The module was located under the 20% of the drivers seat where a center console would be. It was under the carpet. I had to cut the carpet to get to it. Hope this helps.
under the driver seat
The control module is located under the passenger seat.
look for places that say airbag
I found it under driver seat
The airbag module on an 04 Toyota Sienna is located at the front of the engine compartment. It monitors for impacts which cross a threshold which triggers the airbags.