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Heated seats - Ignition on only

Discussion in 'Technical Chat' started by primer, Oct 9, 2011.

  1. Oct 9, 2011 at 2:27 PM
    #1
    primer

    primer [OP] Well-Known Member

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    (Mostly) debadged, Homelink mirror, Elevated rear diff breather, LED illuminated 4x4 switch, Color matched grill surround, Bed cover, Ivan Stewart wheels, Bridgestone 265/75 Dueler AT Revo 2 tires
    As part of the Katzkin group buy I ordered some heating units for my front seats recently. The instructions for putting these in say to wire them straight to the battery. This means that they could be on anytime - even without the key in the ignition. It would be just my luck to accidentally turn mine on when I was getting out of the truck some night and then wake up to a dead battery. I really wanted to have mine where they could only work when the truck was running.

    I got a fair bit of help with this. See this thread:
    http://www.tacomaworld.com/forum/te...easiest-10-amp-wires-heated-seat-install.html

    As always - do this at your own risk. I am not a professional or an expert and have no business giving advice on complex subjects such as modifying your trucks electrical system.

    First you have to install the heating elements. Check out the Katzkin install threads for full instructions on removing/reinstalling upholstery. I suspect most will add heat when you are already doing this part of the project.

    The elements I got for my truck were pretty small. Hopefully they’ll be fine. They have a peel and stick type of adhesive and just stuck right to the foam of the seat. I cut a slit in the foam to route the wiring through.

    IMG_2369_f8197387ed2343bd6a6d7d0b36787ba335e02ae1.jpg

    I put the bottom heater under my butt. When I sit in my seats now, I think it would be better, if you only have one small element to put it under your thighs on the other part of the seat bottom. I didn’t do this because I worried that the wire passing under the bar would cause problems. I’ll bet you could just run the wire directly through the foam to the bottom of the seat and avoid that all together. If it wasn’t such a hassle to mess with this stuff I’d probably change it. Oh well.

    I ran the wiring harness for the R seat under the carpet to the area under the center console then to the L kick panel. The L harness went to the L kick panel as well.

    To get them into the engine bay, I connected them together and ran one power and one ground wired out one of the rubber plugs under the drivers seat.

    P3040084_a8b34274aae7a41dc9103d16bdc8bcbb0a8a8c4c.jpg

    These pics were taken from when I ran other stuff through here - but I just ran these right with them.

    IMG_2150_af572b54847c54fe5db077b48e0c31f9f5d2b062.jpg

    You also have to find a wire that is “hot” when the ignition is on and “cold” when it’s not. This is the one I found that fits the bill:

    IMG_2375_2ecb039d73f6fdfd80101fe726b19983a3a03487.jpg

    It is the blue wire with the yellow stripe. I tapped into it with a wire tap and ran this with the rest of the heater harness to the engine bay.

    All the wires were zip tied together and routed to the drivers side of the engine bay. At this point you could just run them to the Pos battery terminal and to ground, but If you want to have them controlled by the ignition you need to wire them through a relay.

    This is a diagram of what I did:

    HeaterCircuit_c3f753bdcea4911f7d14502e72a4a1c79d6d2585.jpg


    I used this relay and relay socket:
    http://www.amazon.com/gp/product/B000VUAJIM
    http://www.amazon.com/gp/product/B000BTO1HS

    The relay is necessary because it uses the ignition power to switch on power to the seat heaters. If ignition is off now power will reach the seat heaters - even if you flip the switches in the cab.

    I mounted the relay through the hole in the top to one of the holes on the side of the engine bay. It turns out that the bolts that hold the jump seats in place for the Access cab fit these holes perfectly. I had to leave one of my seats out for a little while and tried the bolt here. If I can find a part number or something, I’ll post it - but the closest thing I could find at Home Depot didn’t fit the threads.


    Before installing you need to put a diode in the circuit. Apparently a relay wired like this can allow a spike of current back through your system. It is definitely above my head - but it was recommended to me that I put a diode between the white and blue wires. This allows current to flow in only one direction. I’m afraid if I try to explain my understanding of this someone who really knows what they are talking about will expose my ignorance. If you can explain this to others well - please post it here.

    I used this diode:
    http://www.radioshack.com/product/index.jsp?productId=2036268&CAWELAID=107597561

    You can see that it has a white line at one end - that end should be connected to the white wire. The other end is connected to the blue wire:
    IMG_2426_97367163e68f8b4ec2c869827a00d5a376518cc8.jpg

    IMG_2428_88cb6d56ac837ccf9ca8ca0a192e9f4eb8a92c3e.jpg


    I put some clear shrink wrap over it all so I could still see what I had done if I forgot:

    IMG_2429_8dc8358dcc56e9a04881f09279ba738e45491585.jpg

    The relay socket has five contacts. The center is red and I just trimmed it short.
    The remaining 5 wires connect as follows:

    Black - Pos battery terminal (I put one of the fuse holders from my seat kit here)
    Yellow - Red power wire from seat heater harness
    White - to 12v ignition power (the wire I tapped into at the steering wheel)
    Blue - Ground

    The black (Ground) wire from seat heater harness goes directly to ground as well.

    I need to get a little accessory fuse box, but until then I tried to zip tie everything in place neatly. Sorry for the poor pics:

    IMG_2438_c67f9756edd851023ec309ccddc67a8c63122761.jpg

    IMG_2440_0e22a3879a899c43b8261eeda848797367a4b621.jpg

    IMG_2441_aafb117262a9d80e66709dfd2a898d4b57614555.jpg



    Finally (and to me the best part) I installed the heater switches in the center console. If you remove the shift knob you can pop up the silver cover on the top of the console.

    I drew out where I wanted the holes:
    IMG_2380_9dd1414f39906164cafaef5e4f7c65a2ecc3fc4c.jpg

    Then I used on of these drill bits to drill them:
    IMG_1644_d7fc6f76a5249bccc197ae334467a81ab2a0efc8.jpg

    I had to make the holes a little larger than the instructions said but they fit fine:

    IMG_2381_63eec3ca8f33feab99c81b856619e13fd2338593.jpg

    IMG_2405_538a4e79e4ca1eaf718cd90427a8c88874d04836.jpg

    This is what it looks like underneath:

    IMG_2382_65e32b5269eb540f5bfb81d41cdb2eee271e1511.jpg

    There are some friction clips to attach the cover very close to these spots. I had to use my dremel tool to clean them up so the switches fit OK.

    Now it works just like I want. Heaters are disabled and will not work if the ignition isn’t on. With the ignition on the heaters work perfectly:

    The drivers side switch is on high, the passenger side is on low:

    IMG_2442_2ab5db0fa47d76ee666bec4126e1d092b13cda60.jpg

    IMG_2436_b4976d44ec5f92b30de6c334d4edb1d43014845e.jpg

    IMG_2443_f2f1c36e801a02a1eac29b18db9433686ed3ebee.jpg
     
    Caltech90 and Doughnut Spaghetti like this.
  2. Oct 9, 2011 at 3:05 PM
    #2
    Norton

    Norton Senior Member

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    Nicely done! :thumbsup:
     
  3. Oct 9, 2011 at 3:19 PM
    #3
    SilverBullet07

    SilverBullet07 Silver Member

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    I like it!... If it got really cold here I would definitely do this!
     
  4. Oct 9, 2011 at 3:20 PM
    #4
    Oat

    Oat Well-Known Member

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    Nice!.
     
  5. Dec 3, 2011 at 1:58 PM
    #5
    zul

    zul Professional Goofball

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    This is such a great write-up!! I REALLY want to add heater elements to the stock seats... I'm bookmarking this for sure.
     
  6. Dec 3, 2011 at 4:32 PM
    #6
    primer

    primer [OP] Well-Known Member

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    Thanks. Every time I see those pics I remember I need to get my wiring cleaned up. I have everything I need except some large gauge wire. Need to get that done.
     
  7. Sep 9, 2015 at 10:04 AM
    #7
    YanE30M3

    YanE30M3 GO PATS!

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    subed for reading when I get home.
     
  8. Sep 25, 2016 at 11:18 AM
    #8
    maxpower29

    maxpower29 Well-Known Member

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    Good install
     
  9. Oct 30, 2017 at 10:18 AM
    #9
    Captainskidmark

    Captainskidmark Active Member

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    Nice write up! Does anyone know which position on the fuse panel is actually used for vehicles that come from factory with heated seats? Wondering if that is an option for powering them?
     
  10. Oct 30, 2017 at 10:22 AM
    #10
    Doughnut Spaghetti

    Doughnut Spaghetti Well-Known Member

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    I love the amount of ingenuity that Tacoma owners put into their trucks!
     
  11. Nov 8, 2017 at 8:45 AM
    #11
    Captainskidmark

    Captainskidmark Active Member

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    Last edited: Nov 8, 2017
  12. Nov 9, 2017 at 1:35 AM
    #12
    Wyoming09

    Wyoming09 Well-Known Member

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    Nice write up

    If we had a colder climate here in Pa it might be a interesting project .

    But some winters never being below zero for days on end they would most likely never get used.
     
  13. Nov 9, 2017 at 1:56 AM
    #13
    Caltech90

    Caltech90 Well-Known Member

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