Retrofitting seat heaters?
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Thread: Retrofitting seat heaters?

  1. #1
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    Retrofitting seat heaters?

    Okay, here is where I am at.

    I have retrofitted GT3 seats installed in the car.

    I have a new dash panel with the seat heater buttons.

    I know I need the wiring, but apparently I am missing a "Onboard Network Controller"?

    Does this make sense to anyone?

    If so, is there a part #?

    It is almost warm enough to where I don't need them for the summer, so I really want to get them working!

    Thanks for the help.

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    Re: Retrofitting seat heaters?

    Maybe someone with heated seats and Durametric can help confirm this (I don't have heated seats either), but I suspect there is a DME module or link thru one of the computers necessary to make it work.

    I don't know about Porsche, but when I tried to retrofit seat heaters into a Subaru, I was surprised to learn that they had completely different wiring harnesses from the factory, depending whether or not the car had heated seats as an option. I stupidly thought that they would just leave some unused connectors hidden away if you didn't order it. I suspect Porsche is similar in that regard, so I don't know whether you will be able to make the necessary connections or not.

    I doubt anything on a modern Porsche operates: battery:fuse box:switch:device (except for my radar detectoricon ).
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    Re: Retrofitting seat heaters?

    Does anyone else know? I would think with the right parts, it shouldn't be that hard.

    Thanks again for the help.

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    Re: Retrofitting seat heaters?

    There is an aftermarket heat seater option. I think they sell for $90 or so. Its completely aftermarket, so it comes even with its own switch but I am sure you can use yours. eBay and a Porsche replica seat company out of Cananda has these.
    Tomasz

    Apologies for spelling mistakes, most of them are keyboarding errors. To enjoy this forum I run out of time to proof read.

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    Re: Retrofitting seat heaters?

    I don't know the part number, but yes, you do need a controller as well as the wiring. The biggest obstacle you'll need to overcome is the wiring, imo. All Porsches have a huge wiring harness that is unique to that particular car and it's factory options - AFAIK you'll have to hack into the wiring harness in order to get the wiring up to the buttons on your dash panel. That's a tall order - the harness is huge and if you get it wrong, you're looking at thousands of dollars in parts and labor to acquire and install a new one. The wiring harness is the first part made for each car, and the assembly process can't begin until it is ready. I believe getting a new one also takes about three months.

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    Re: Retrofitting seat heaters?

    Well that doesn't sound too pleasant. I was thinking it could be 'hot wired' between the switch, the new control panel with the heater buttons, and the new seats. At least that's what I was hoping for. Hard to believe that no one has pulled this off with factory parts.

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    Re: Retrofitting seat heaters?

    The custom wiring harness does make it pretty hard to retrofit many of the factory options, that's for sure...

    brad
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    Re: Retrofitting seat heaters?

    Quote Originally Posted by Brians View Post
    . . . Hard to believe that no one has pulled this off with factory parts.
    I can tell you that one of the problems you will have, even if you try to "hot wire" it as you say (e.g. by tapping into another 12V line or preferably, the fuse box directly), is finding those connector plugs that are specific to the seat connector, dash panel, etc. Those "factory parts" are not easily available.

    There is almost no uniformity or standard design for those plugs - there are usually a myriad of designs/sizes even within a single car, depending on their function; and without an appropriate wiring harness, you would probably have to cannibalize another car with seat heaters to get those connectors.

    If you are really good with electronics, I suppose you could try to direct solder or jury-rig some kind of connection at the dash/switch panel and seat connection, if you can figure out the appropriate terminals. But, if the dash panel is somehow tied into the DME, then you may still get some kind of error message (though maybe that could be addressed with PIWIS or Durametric?).

    I don't mean to dampen your enthusiasm, but having been down this road before, I tend to agree with Thomasz - that you may have to look to an aftermarket solution (which is what I ended up doing with my Subaru after facing similar issues as you).
    Last edited by KS-CS; 03-04-2009 at 08:31 PM.
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    Re: Retrofitting seat heaters?

    Okay, let's assume I "settle" for the aftermarket solution. Is there a possibility I could blend the aftermarket parts with the stock? I am thinking replacing the aftermarket switches with the stock dash switch, and use the stock seat heaters vs. the aftermarket seat heaters. In essence, just use the aftermarket wiring to power the seats. Does that sound reasonable?

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    Re: Retrofitting seat heaters?

    I think the switches should be changed to the OEM ones. Absolutely!

    But I do not think that there is a stock solution for the GT3 seats. So, I am not sure if buying stock heaters for NON GT seats is worth the premium...

    Have you found the company that offers this? Wish they were an advertiser.
    Tomasz

    Apologies for spelling mistakes, most of them are keyboarding errors. To enjoy this forum I run out of time to proof read.

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    Re: Retrofitting seat heaters?

    Well, let me explain.

    The seats are from a GT3, but they are the leather sport seats with the alcantara inserts, with the heaters already in place.

    Does that make any difference to anyone who is following this thread?

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    Re: Retrofitting seat heaters?

    Ohh. They will never fit. You must sell them to me.

    Just kidding on teh fit. Now I understand. How did you find these?
    Tomasz

    Apologies for spelling mistakes, most of them are keyboarding errors. To enjoy this forum I run out of time to proof read.

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    Re: Retrofitting seat heaters?

    I found them trolling the classifieds on 6speed Online (sorry Ken!). They were hanging around for a while and made an offer. Bolted right up. Very sweet. I also have the alcanara GT3 RS wheel, shifter, e-brake handle, and console cover. I'd love to get the doors redone in leater/alcantara as well. On the wish list.

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    Re: Retrofitting seat heaters?

    Quote Originally Posted by Brians View Post
    Okay, let's assume I "settle" for the aftermarket solution. Is there a possibility I could blend the aftermarket parts with the stock? I am thinking replacing the aftermarket switches with the stock dash switch, and use the stock seat heaters vs. the aftermarket seat heaters. In essence, just use the aftermarket wiring to power the seats. Does that sound reasonable?
    Well in essence, that was what I was suggesting you could do in my post above - if you can figure out which wires to attach to which terminals on the switch and heater connectors. But if you're going to do that, then you don't really need the aftermarket kit to begin with - just go down to Radio Shack and buy some wire, etc.

    Here's what I would suggest: a mock-up - try to wire together your switch panel and seat heater, with a 12V battery and inline fuse, outside the car (before you go tearing things apart) and see if you can make it work that way first . . . that's what I would do.
    Last edited by KS-CS; 03-05-2009 at 08:18 PM.
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    Re: Retrofitting seat heaters?

    I am so jelaous. Good luck.
    Tomasz

    Apologies for spelling mistakes, most of them are keyboarding errors. To enjoy this forum I run out of time to proof read.

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    Re: Retrofitting seat heaters?

    Quote Originally Posted by Brians View Post
    I found them trolling the classifieds on 6speed Online (sorry Ken!). They were hanging around for a while and made an offer. Bolted right up. Very sweet. I also have the alcanara GT3 RS wheel, shifter, e-brake handle, and console cover. I'd love to get the doors redone in leater/alcantara as well. On the wish list.
    Brian,
    I don't care where you get them from, but they sound like regular sport seats with heaters (what I have in my car) and not "GT3 seats" in that they aren't the carbon fiber shell deep dish with belt cut-outs as those don't have seat heaters because the cushions are removeable.
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    Re: Retrofitting seat heaters?

    Kman, I thought you had the GT3 seats installed. Or do you switch back and forth? I am trying to decide if I want to go teh GT3 seat route or Sport Seats or just stick with the standard ones I have. I guess Cayman GT should have at least the Sport Seats...
    Tomasz

    Apologies for spelling mistakes, most of them are keyboarding errors. To enjoy this forum I run out of time to proof read.

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    Re: Retrofitting seat heaters?

    Quote Originally Posted by K-Man S View Post
    Brian,
    I don't care where you get them from, but they sound like regular sport seats with heaters (what I have in my car) and not "GT3 seats" in that they aren't the carbon fiber shell deep dish with belt cut-outs as those don't have seat heaters because the cushions are removeable.
    Of course you are right Ken. They are not the carbon fiber shell with belt cut-outs. They are the sport seats with Alcantara inserts. They are from a GT3, but I guess that doesn't make them GT3 seats. My bad.

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    Re: Retrofitting seat heaters?

    Quote Originally Posted by KS-CS View Post
    Well in essence, that was what I was suggesting you could do in my post above - if you can figure out which wires to attach to which terminals on the switch and heater connectors. But if you're going to do that, then you don't really need the aftermarket kit to begin with - just go down to Radio Shack and buy some wire, etc.

    Here's what I would suggest: a mock-up - try to wire together your switch panel and seat heater, with a 12V battery and inline fuse, outside the car (before you go tearing things apart) and see if you can make it work that way first . . . that's what I would do.
    Good idea with the battery and inline fuse!

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    Re: Retrofitting seat heaters?

    It is extremely unlikely that the Porsche seat heater switches are capable of carrying the current necessary for seat heaters. Those are very light-duty switches. Plan on installing relays capable of handling around 30amps! If my CS was here at the house, I'd go out and turn the heaters on/off without the engine running. That would let one listen for the sound of a relay and give a hint where they normally hide them. Perhaps someone whose car in nearby could try this and post what they experience.
    L8apx


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