Seats are out

[ben24]

I just stropped out my rear seats and seatbelts , i also took out my amp and sub ( in the for sale section ) now the airbag and service light have come on

i did disconnect the battery to take of the power lead for the amp but i would of thought that would not of made a differance.

also i had to unplug the rear seat belts from a plug ?

any ideas guys