Do you have a button pic? Do buttons do left, right, and middle heating? Does a panel need to be replaced? Time to go parts hunting.

Yes
Just type in Rear heated seats bmw e53 On google.
Can't really upload many pictures since all of them have to be manually resized and it's just something out of previous century that I don't do anymore. This forum needs a major update.

I use tap a talk for that reason. It's Not been showing unread posts correctly though.