Well, it was finally cold enough to use the heated seats in my 2003 CL-S. The switches both light up, but only the passenger seat gets warm. Any ideas what might be going on or what I might be able to check on my own.

Thanks!

 

Could be a fuse but more likely the wires are burnt out in the heating pad. The pad is under the seat cover. If you search for it, you can fix it yourself by removing the leather cover and soldering the broken connection.