2013 ST3 Heated Seats

As the title says, my heated seats are not working. Specifically the drivers seat. It warms to a very Luke warm feeling but that's it. I've tried pulling the fuse and seeing if that was blown. I've also tried to google it and nothing has come up. I just wondered if it was like a plug in somewhere that has came undone. Anyone else experienced this or know what the fix is? Thanks in advance.