On my HHR wish list, wish there was a way to just heat the back portion and not the bottom of the seat at times. Anyone else thought of this? Wonder if one could find the wire that heats the bottom and install a switch that would open that circuit and just heat the back portion.

 

The two elements are in series. Do you know what to do?

Heated Seat – Driver

 

No, Your help would be appreciated.

 

And note that the t-stat is in the seat cushion. Too dangerous for me.

Here is the wiring diagram as a PDF a little different from the schematic
heatedseats.pdf

 

It's to complicated to go through on here.

 

Guess it's more complicated than I thought. Thanks for the info.

 

Since they are in series the voltage is dropped half across each element so we would need to build a step down circuit to supply the correct voltage across the element. If not it will burn out the element quickly and it could get to hot and possible cause a fire. If the elements were constructed in parallel we could just use a switch. In a parallel circuit the voltage is full across both and you can use a switch to turn it off.
Do you understand basic electronics? If you understand what I just told you we could probably do it.

 

Thanks Greg, I do understand basic electronics, now that I understand how it operates, it's more work than I thought. Thanks again!

 

I would be more worried about the thermostat, it could get mighty hot.

 

That's why you would need circuitry to lower the voltage to the correct level. As I look at it again it may still not work correctly if the module don't like it. I'm not sure that it don't monitor it's output for anomalies.