I am a new owner of a gently used 2012 Cayenne S, and I noticed the rear heated seats were not working. None of the lights would light up when either button was pushed. Long story short I was looking through the maintenance records from the initial owner and the dealer 20k service sheet stated that the customer said the rear heated seats did not work, and they charged zero to fix it because ......the rear child lock switch on the drivers door was activated. Sure enough I turned it off and they work. So, while this may be obvious to most, in case there is another new user (or first time with rear heated seats) I figured I would post it. Also I felt a little better since the first owner had the same oversight. I plan to post some reviews and thoughts on accessories here moving forward.