Seat Heater switches
audi at humanspeakers.com
Sat Jan 31 07:43:49 PST 2015
VAG's schematic symbol for any level of microprocessor control looks
like a single transistor (although this may be one).
The sensor is almost certainly just some sort of thermistor.
What you want, I suppose, is the whole package out of a parts car -
sensor, switch, control unit, all times 2 of course.
Or you could build a timer circuit to turn it on and off for varying
duty cycles. Might be easier.
On 1/31/2015 10:27 AM, Nicholas Miller 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
>> 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
>> 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,
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