Seat Heater switches

Huw Powell audi at
Sat Jan 31 07:18:32 PST 2015

Hi Nick,

In short, what you want to do won't work.

The Audi seat heater switches with multiple heat settings (at least, 
thes that I am familiar with) depend on a sensor in the seat to measure 
the heat level.  There is no potentiometer, per se, to simply adjust the 
current delivered.

You'd need to install the sensor and the control "relay" for each side 
as well as the switch.

I suspect the control units compare the resistance of the sensor with 
the resistance set at the switch to turn the heat on and off at the 
desired temperature.

All the best,


On 1/31/2015 4:51 AM, Nicholas Miller wrote:
> Hey everyone,
> Does anyone have some pairs of Heated seat switches around?  I want to
> retrofit a few of my cars with these Audi/vw switches, as I have a 1
> position button on my heaters for right now.  I'd like to try and retrofit
> the Audi switch into the car.
> Has anyone done this before?  I'm not sure if it will work, but in my head
> it should be simple, I'm assuming its Vin, Gnd, Vout, and Backlight Vin,
> and the switch operates like a potentiometer.
> P.s.  The candidates are 2 MX-5s, a Mazda 3, and a Mitsubishi Eclipse.
> Cause its cold up here in MN.
> Cheers all,
> Nick
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