Heated Seats!!!! and Service Engine Soon!

I have a 98 grand prix GT! Recently I noticed that my heated seats is not working on the driver's side! The light is still on but the heat is still not working!

Also.... SES light is on!
How do you reset this? It's weird because my car acts funny after staying outside in bad wether! We think this has a lot to do with why the light is on!
Please help me with any info! Thanx! :o)