Both seat heaters work, passengers seat's switches all work. The driver's seat has never worked since purchasing it used. It didn't come with the fuse panel diagram, so I just pulled every fuse and they're all good. I think it might be the the driver's side power seat control module, but don't know how to test it and the passengers doesn't swap over The part costs 150. used making it a bit pricey to buy and see if it does the trick. I have pulled the module out opened it and checked for scorch/damp marks or other obvious signs of failing components.. It looks really good.... Any help will go a long way please and thank you!