Heated seats ??

Picked up a nice set of leather seats for my 2004. These seats came out of a 2008 from a salvage yard. Upon further investigation I noticed a switch on each side of both seats. Underneath is the usual wires. And then extra wiring with a relay ? I see two power wires and a ground ? I’m assuming They’re heated seats?? One of the red wires is thinner. Other one is thicker metal ring terminal on end of it. I use to install a lot of car audio. If these are heated seats how would you finish installing them ? Thanks