Boxster Seat Heater Connections and Pathways
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Thread: Seat Heater Connections and Pathways

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    Seat Heater Connections and Pathways

    Hi all,
    So I'm working on putting together a project to put stock seat heaters into my 987.2. It appears to be an impossible task - but I choose to do this and the other things not because they are easy, but because they are hard. Actually, I just want to enjoy my new to me boxster into the spring and fall a little more.

    The problem I'm having is that there appear to be resources for the 986, wiring diagrams etc available on the internet but nothing for a 2011 987.2. I've installed a new AC controller with seat heater buttons but am having having real difficulty learning if my 12 way power seats already have heating elements in them that just need to be turned on? Or if I need to purchase new elements/cushions. Shop manual says that heating elements are now only sold in cushions. Oh, then there's the issue about what gets connected to what. Went to the dealer the other day and asked if a technician could guide me/help if I paid for their time and was told they couldn't due to liability reasons.

    So here are my specific questions for this group...
    1) Is it true that the seat heater connection goes from the AC Controller, to the front computer and from the front computer to the seat heating elements? If this is the case does the front computer need to be replaced with one that had standard heated seats added? Or is this a modifiable feature on a PIWIS?
    2) Two of the four pin sections on my AC controller were unoccupied when I replaced my old one with the new one with the seat heater buttons on it (banks 1&3 were occupied, 2&4 were not). Does anybody have a wiring diagram for where the AC controller connections run to on the electronics side?

    I think if I can get those two questions answered I'll be headed in the right direction. Love my car, and I don't mind the challenge of solving an interesting engineering issue for me.
    Many Thanks,
    Stephan

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    Re: Seat Heater Connections and Pathways

    Sent me a PM. I can help you out with the schematic portion of your question.
    2009 Boxster Base

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    Re: Seat Heater Connections and Pathways

    So the latest on my attempt to retrofit seat heaters into my 2011 Boxster. Installed the new AC Controller unit that has the seat heat buttons on it. Lights come on, it looks great. It was a 10 minute install that I'm compiling a video of now. (Lights for seat heaters turn on, but seat heat doesn't). Next I purchased a Durametric Pro to turn on the seat heat at the Vehicle Electrical System Control unit. So two parts of the seat heat pathway are a go. (Durametric Pro is very cool by the way, while I was at it I changed my side marker lights to be turn signals and turned off the seat belt chime).

    Next steps will be checking to see if my currently installed 12 way power seats have heating elements installed that just need to be plugged in somewhere OR if I need to purchase heating units, and have them installed. Alternatively, may just get used seats off of ebay that have the units installed already. The final step will be checking to see if I have any wires going from the Vehicle Electrical System Control Unit to the seats already. (Thank you to members who sent me wiring diagrams). If those aren't in place I'll need to run new wires and might take it to a shop to do that.

    Now that we're into summer it's less of an issue. But for me the fun is in the challenge of doing this and learning about my car. I'm compiling videos and pictures and will put out a summary if I'm successful.

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    Re: Seat Heater Connections and Pathways

    Hi. Any progress on your project? I’d like to do the same on my 2011 987. It has sport seats that weren’t available with heaters.

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    Re: Seat Heater Connections and Pathways

    Hi, I'm also interested in this. I just replaced the climate control unit from manual to auto with the heated seats buttons on a 987.1. I'm trying to figure out the wiring for heated seats buttons. Right now they don't even light up and I'm not sure if the existing harness has wiring for them.

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    Re: Seat Heater Connections and Pathways

    OK So I've made significant progress - but still not there yet. I've installed the new climate control unit and the unit lights up. To me that says there's a connection between it and the gateway. The longest amount of time was spent looking for heated seats and I finally found some - It was tough to locate Grey, 12 way power, lumbar, memory, heated seats with crests. But I found some on e-bay and purchased for $450 + $350 shipping. They installed easily. So now I've got the heated seats, I've got the climate control unit. Now I just need to run the wires - which is also not as easy as first suspected. I need to get access to the fuse box that's above the passenger side foot well and run two wires from there to the Vehicle Electrical System Control Unit which is somewhere by the drivers side fuse box (I believe). I haven't located the VESCU yet, and the fuse box is behind an obstruction I haven't figures out how to get past yet either. Once the wires are run from there, I need to run wires from the VESCU to the yellow connectors on the seats. Pin 8,9 and possibly 13 - but I'm still finalizing wiring diagrams for that part.

    I really need the most help locating the VESCU at the moment and figuring out 1) how to access it 2) what size wires to run from fuse connections to the VESCU, and then again what size wires to run from the VESCU to the seats themselves.

    I have the durametric pro and have turned activated seat heat on the gateway menu....but the seats I have still need the connection from the VESCU to the seats and from the fuse box to the VESCU.

    I'm still enjoying learning about the car and hope to have heated seats by fall of 2019 (at this pace)....but I'm closer now than I have ever been.

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    Re: Seat Heater Connections and Pathways

    Continue to make progress-
    Where I am at the moment...
    Used heated seats, grey, with crests, put in.
    Climate control unit with heated seats button put in.

    Now I'm looking to make the necessary wiring connections. Not sure what's present yet till I get to the Vehicle Electrical System Control Module and see which wires are in the connections. I know that I'll need to wire from the VESCM to the seats at least. I found out how to access the VESCM. It's under the drivers side dash and to access it I need to remove a number of the dash trim pieces. If you're following along in the shop manual to access the VESCU you need to look up WM 702419, WM701919, WM978319 and WM97109. Those are the instructions that will get me to the VESCU.

    Next challenge is to figure out how to add a wire to the VESCM wiring harnesses. (Specifically, I'm looking to add a wire to part A of the attached picture.
    Anybody know how to do that?

    All help appreciated!
    Stephan

    Seat Heater Connections and Pathways-img_0463-jpg

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    Re: Seat Heater Connections and Pathways

    Have you thought about going outside the existing harness and running your own stand alone harness from a strong enough power source (maybe even straight from the battery)? If you have the switches lighting up - run a lead to a relay and a 3 step pot. Any lights on closes the relay. Depending on the setting - varying current goes to the heater.

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    Re: Seat Heater Connections and Pathways

    I'm assuming that the power comes from the Vehicle Electrical System control module once it gets the information from the climate control unit. (at least that's what the wiring diagram looks like). I'm essentially working backwards, trying to keep the existing architecture as much as possible. Your way sounds like it would work and I'll go that route if I can't figure out how to add a wire to the VESCM harness.

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    Re: Seat Heater Connections and Pathways

    Need help adding a wire to an existing wiring harness. I am going to be working to access the Vehicle electrical system control module under the steering wheel in coming weeks and I want to be prepared to add a wire to the spade-type connector on A1 & A2 and B25&26. The wiring harness connection is the kind that has a lever locking it into the VESCM. I'm wondering if anybody has experience adding a spade connector to this connection (or this type of connection - similar connection type located in the frunk ECM). My best bet is to find a wiring harness I can pull one spade connector out of I think and just splice/solder the connection in.

    All help appreciated.

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    Re: Seat Heater Connections and Pathways

    OK made some significant progress. Still not there yet...
    1) I found out how to access the vehicle electrical system control module under/behind the drivers dash panel. Instructions for removing that panel were found on the PCA Boxster Registry. There was a devil of a dash screw that was hard to get to on the upper left part of the steering column but the rest were pretty straight forward. Whoever did that write up did a great job as all screws were easily identifiable. Everying (pretty much) is a Torx 20. Except for the carpeted connection to the center console which is a Torx 30.
    2) I added two wires to the VESCM - Plug B - Spot 25 and 26. One goes to the heated seat (pin 8), the other I have to connect to a power source somewhere. To be as OEM as possible I need to connect to the electrical distribution system behind the passenger side glove box. Still working out how to access that. For the moment that wire (connected to pin 26) is wrapped up in the center console.
    3) I don't know if I need to add another ground connector to the yellow connector under the seat that now has pin 8 connected. Will look into this.
    4) I ran my wire from the VESCM to the seat through the door sill. Got instructions for how to access that area off of PCA Boxster Registry as well.
    5) I got my pins/connectors from a harness to a 981 I purchased off of e-bay for $50. The wires are 14 gauge (I think).... I'm hoping thick enough to handle the current. If not this could be a costly attempt at something. I have videos of everything and if this works I'll be putting together a full write up. If it doesn't work and bursts into flames i'll let ya'll know as well.
    Stay tuned.
    6) I haven't connected the passenger side connections yet. I'm really trying to see if I can just do the drivers side first. Passenger side connections to VESCM are plug A pins 1&2. They would also go to pin 8 in the passenger seat connector TSX17.

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    Re: Seat Heater Connections and Pathways

    So hooked the power wire going to the VESCM to a 15Amp fuse for the cigarette lighter. Tried turning the whole system on, no joy. Hooked up the durametric to make sure that heated seats installed was on in the gateway - they are.... but still no heat. Wonder if I need to actually go to the 80Amp electrical distribution module (Fuse bank F behind the glove box).... but I don't know. Also wondering if I need to make a wired connection from the actual seat heater buttons on the climate control module somewhere. I thought that connection was in place as the lights for the seat heaters light up when the button is pressed.... but that might be another avenue to look into also. I also have not gotten my voltmeter out to check connections etc. either. At the very least, I haven't fried anything that I know of and the car still runs well. So I haven't damaged anything too gravely. And all my modifications are reversible. Alas, still no joy.

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    Re: Seat Heater Connections and Pathways

    New area to focus on in my continued quest. The first is the question I'm posting here. From Bank D of the climate control unit there's supposedly a wire that runs to NTC. From my army days that stands for National Training Center. I don't know what that means in the car or where it would be located. My guess is a thermostat somewhere from my own brief online search. I'm attaching a sub picture of the wiring diagram from the back of the climate control unit. Anybody that can tell me where the wire from the 'Left Seat' button runs to will be a hero.
    See attached imageSeat Heater Connections and Pathways-screen-shot-2019-04-15-1-56-30-pm-png
    Last edited by sweinland; 04-15-2019 at 12:03 PM. Reason: trying to attach an image

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    Re: Seat Heater Connections and Pathways

    Temperature probe. See https://www.te.com/usa-en/products/s...s-sensors.html

    Good luck.

    Joe Henley

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    Re: Seat Heater Connections and Pathways

    Looks like the wire from the left seat terminal (on the AC/heater controller) goes to the NTC sensor. So, IIUC, there's a temp sensor in the right and left seats (or maybe "for" the left and right seats located somewhere else -- from the diagrams I can't tell if the sensor is in the seats or maybe in the HVAC ducts under the dash). Poke around in the service manual to see where the sensor is.

    Good luck.

    Joe Henley

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    Re: Seat Heater Connections and Pathways

    Found it. NTC- and NTC+ are pins 1 and 2 in the yellow connector under the seat. So it looks like there is a feedback loop that goes from the seat to the climate control unit. Makes sense. Now I just need to figure out how to make the connections. Thank you!

    Seat Heater Connections and Pathways-screen-shot-2019-04-17-11-33-07-am-jpg

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