Customized Steering Wheel Buttons!

Discussion in 'Gen 3 Prius Audio and Electronics' started by Bohemian Grove, Jan 23, 2025 at 3:35 AM.

  1. Bohemian Grove

    Bohemian Grove Junior Member

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    Dear Wizards of PriusChat… I have an idea…


    First off, we discovered, if you have a Prius without the voice control button or telephone buttons, you can swap your old circuit board with one with those buttons… and those features will automatically work with an android headunit!


    Easy & Awesome!


    Now, my plan is… to add the missing buttons, to the right side of the steering wheel!


    I imagine, this won’t automatically give me Lane Keep Assist & Radar Cruise… lol… so the idea is to wire these buttons for aftermarket additional features.


    But the question is… where do these button wires go, after the clockspring?


    There are 2 missing wire pins in the plug going into the clockspring, I assume for the 2 missing buttons…


    Also, I’ve seen 3 !! buttons on some V wagons! But maybe the circuit board is too different…


    Can’t find any info on this… any advice is greatly appreciated!


    Thank you Prius family! :)


    8628982D-47B2-4337-A3B6-B208D66AD178.jpeg 09567D67-B987-4116-909E-7D48E6FF9717.jpeg C7368CA3-0033-4C2F-B970-EE6BD8ABD0BA.jpeg
     
    #1 Bohemian Grove, Jan 23, 2025 at 3:35 AM
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    You can access the electronic wiring diagram with an inexpensive subscription to the tech info library, with details on this link.
     
    #2 Leadfoot J. McCoalroller, Jan 23, 2025 at 8:24 AM
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  3. ChapmanF

    ChapmanF Senior Member

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    They pull pin 4 of connector z9 (on the steering wheel side of the spiral cable) to ground: the distance button directly, the lane button through a resistance.

    That comes out as pin 11 of L52 on the column side of the spiral cable. A red wire from there goes to pin 64 of junction connector 3B, emerges again from pin 52, still red, runs to pin 11 of junction 4A, emerges again from pin 79 of 4B, still red, and goes to pin 6 of L60 at the driving support ECU.

    That is one weird photo.
     
    #3 ChapmanF, Jan 23, 2025 at 10:04 AM
    Last edited: Jan 23, 2025 at 10:17 AM
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  4. Bohemian Grove

    Bohemian Grove Junior Member

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    Confirmed, ChapmanF has done it again!

    Z9 pin 4 is indeed blank on mine…

    If L52 pin 11 is blank… maybe this will be easy…

    Maybe…

    This is for the Distance button.

    The LKA Z9 pin 6 is also blank…

    But it looks like it connects to the cruise control within the spiral cable? So that’s impossible? IMG_8140.jpeg Maybe I’m misreading this…

    And yes my Prius is far from normal. Usually I’m on the Facebook forums answering 101 questions. PriusChat is for the pioneers!
     
    #4 Bohemian Grove, Jan 23, 2025 at 1:55 PM
  5. ChapmanF

    ChapmanF Senior Member

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    The photo is weird because it looks double- (or more) exposed.

    Given that z9 pin 6 and z10 pin 4 both connect to ground (L52 pin 2), I guess I wouldn't be surprised if they did just make that happen inside the spiral cable. Have you checked for continuity between those pins?

    I think the upper- and lower-caseness of Toyota's connector names matters. There could also be an upper-case Z9 hanging out somewhere.
     
    #5 ChapmanF, Jan 23, 2025 at 3:39 PM
  6. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    All the popular smartphones are doing some pretty clever tricks with lengthened exposures and automatic compositing of multiple exposures without telling the user what's going on. Makes for interesting, and often good-looking results but there are some weird artifacts too.
     
    #6 Leadfoot J. McCoalroller, Jan 23, 2025 at 4:22 PM
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