None of the buttons/functions are working on my right front seat. The drivers seat still works.

Update!!!

I found the circuit card burned up. I need a new/used seat controller for the right front seat on my 1991 940SE Turbo Wagon

 

I'd like to know what's up with this too...I have a heated seat swich that isn't working properly on my 240. I was told that "swiches just wear out" when they couldn't find the problelm.

 

Are you 100% sure the Stop button isn't pushed down?

Also check here for a wiring diagram.
http://www.volvotechinfo.com/WD123/

 

wtf? Stop button?

 

Yes some have one on the car. You can't miss it if it has it. It is a Big RED button and has STOP above the switch.