Seat Heater switches

[Cody Forbes]

Right, so rather than the minutely complicated closed loop feedback system that Audi uses, one could very simply use a multi-position rotary and a couple high wattage resistors (or a timer/voltage regulator) to have multiple open loop options.

-Cody Forbes (mobile)

> On Jan 31, 2015, at 1:05 PM, Huw Powell <audi at humanspeakers.com> wrote:
> 
> Because the heaters themselves, the elements, are either on or off.
> 
> The key is to turn them on and off automagically to maintain a set temperature.
> 
>> On 1/31/2015 12:27 PM, Cody Forbes wrote:
>> Why not just a multi-position rotary switch with three or so settings?
>> 
>> -Cody Forbes (mobile)
>> 
>>> On Jan 31, 2015, at 10:27 AM, Nicholas Miller <chance9121 at gmail.com> wrote:
>>> 
>>> 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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