I will be replacing my seats soon (hopefully they should be here the end on next week) and have been looking into the problem of the pre-tensioner that when you disconnect the loom to the seats the SERV and AIRBAG lights come on.
All that is required to extinguish (spelling) the lights is a 3.4 Ohm resistor across the 2 pre-tensioner wires in the connector on each seat plus the 2 wires that go to the drivers seat belt clip also need to be linked out to stop the stupid buzzer sounding when you are driving.
Hope this helps.
Paul