Seat Heater switches

[Nicholas Miller]

I think I've seen this in the diagrams.  It states "relay" but it looks
like a transistor.  This is the item you refer to?  I could get ahold of
those and replicate it in my car.  The trick is then if the installed
heater will play nice.  Is it literally a heat sensor that communicates
back to this relay, or does it just know to vary the current/voltage?

Either way, understand it may be an all or nothing package.  I don't care
for my 1-setting Mazda 3 heaters... They are a bit all or nothing.

On Sat, Jan 31, 2015 at 6:18 PM, Huw Powell <audi at humanspeakers.com> wrote:

> 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,
>
> Huw
>
>
> 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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