Seville Ride Level

I have a 1997 Seville that sags when there are passengers in the back seats. Also did this car have airbags when new. Thanks for any help.

is the ride controle lite on?and there were no air bags, a silinoid controle the struts through the computer, my 92 lite is on and my mechanic explained to me that the computer has to be reset through the dealer, if the tires are changed and the ride controle is not disabled then the computer shuts it down, most tire busters are not aware of this