It is always best to re-install airbag control module last, after all bad air bags, seat belts, impact sensors are replaced/connected. Make sure battery is disconnected any time you are working on SRS system components, not to trip the light because it will store a soft code for the part that was not connected or plugged in properly. If you need to work on the seats, no problem just disconnect the battery and make sure everything is reconnected before you reconnect the battery. Worst case scenario is that you will have airbag light on and you will need to use a diagnostic scan tool to clear air bag codes.