Hey guys, I just found out my right-front (passenger) seat heating does not work at all. When I turn on the heater (in front of the center armrest), the little LED indicates that it should work, but the seat remains cold.
Where should I start?
I checked the wiring under the seat, everything looks great, no breaks or any other type of damages.

 

if you unplugged the connector to inspect for corrosion and properly clicked it back together. I suppose using an ohm meter to check the seat elements for an open or high reading is your next step. Just take readings on driver side as you know they are correct and compare. There was a recent post about someone using an aftermarket heater under the skin, required a separate switch install.. If I recall the OEM element comes with new cover only $$$

 

Try toggling the **** from cold to hot a few times.

 

Most likely something along these lines: Seat heater switching off

Heating for the seats works in two stages: first, a resistive wire mat turns on for quick heat. Second, while the mat is actively warming, small Peltier elements in the seat cushion and back switch on and begin heating. After some amount of time (not sure if it's strictly time-based or based on Peltier temp), the mats switch off and the seat blower drives air through the heater elements and out the cushion perforations. I find the air flow is most noticeable in the middle of the seat cushion.

There was a known issue with older cars where the heating elements didn't work correctly; the service procedure was to replace the elements. Since your indicator lights come on, that suggests to me that the seat control module is working okay and the problem lies between the module and the heater. There's not really a way to test this without at least unbolting the seat though. You should be able to get access to the back heater by removing the seat back with the seat in the car, but any farther access will require seat removal. I would probe for current at the back heater connector; if you get power then it's likely the climate elements and I would pick up replacements before removing the seat.

If you get used parts, the facelifted cars do have a different duct system and slightly different positioning of the components.