Seat Heater switches

[Huw Powell]

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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