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Repurpose Qi Switch for behind dash usb

Discussion in '3rd Gen. Tacomas (2016+)' started by BBQtaco74, Dec 29, 2019.

  1. Dec 29, 2019 at 7:57 PM
    #1
    BBQtaco74

    BBQtaco74 [OP] Member

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    Hey!

    I’m going to be installing a USB behind my dash. I was thinking about wiring my usb to the Qi switch for the on/off toggle and for its power. The plan is to make the charging pad non functional. The UBS has 2 wires. I’m little confused where those wires would connect because the Qi pad has more than 2 wires. Your guidance would be appreciated!
     
  2. Dec 29, 2019 at 8:27 PM
    #2
    Norsemanvike

    Norsemanvike Well-Known Member

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    If you figure this out, I'll bet you could create a kit for this and start selling it.
     
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  3. Dec 29, 2019 at 8:30 PM
    #3
    BBQtaco74

    BBQtaco74 [OP] Member

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    that’s a big IF!
     
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  4. Dec 29, 2019 at 8:31 PM
    #4
    El Chivo Norteño

    El Chivo Norteño Well-Known Member

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    Or make it so you can power up a Valentine One Radar detector :thumbsup:
     
  5. Dec 29, 2019 at 8:33 PM
    #5
    Speedfreak

    Speedfreak Well-Known Member

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    The USB should have 4 wires. 2 for power and 2 for communication. The Qi charger is not connected to the USB and not part of it.
     
  6. Dec 29, 2019 at 8:36 PM
    #6
    CAG Gonzo

    CAG Gonzo Ascendant Spaghetti

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    You could use a cigarette adapter with external wires and connect those to the power and ground wires of the switch. However, you'd be limited to whatever current that switch supports. I think the OEM switches only do 3A.

    But if you use a relay you can tap into a higher rated fuse and use the switch to actuate the relay.
     
  7. Dec 29, 2019 at 8:41 PM
    #7
    BBQtaco74

    BBQtaco74 [OP] Member

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    The USB has 2

    https://www.amazon.com/dp/B07T2YFG9M/ref=cm_sw_r_cp_api_i_W8xcEbZ3N0S2C

    The goal is to take the power from the Qi charger to power the new usb. I’d like to repurpose the Qi switch for turning the usb on/off.
     
  8. Dec 29, 2019 at 8:42 PM
    #8
    BBQtaco74

    BBQtaco74 [OP] Member

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    I wouldn’t be pulling power from the switch. I’d be pulling power from the Qi’s power source.
     
  9. Dec 29, 2019 at 8:49 PM
    #9
    CAG Gonzo

    CAG Gonzo Ascendant Spaghetti

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    Right on. Don't know how much current that draws but I know it didn't do a great job at charging my phone; I was showing about 500mA on average but that could be a limitation of the charger rather than the circuit it uses.
     
  10. Dec 29, 2019 at 8:53 PM
    #10
    BBQtaco74

    BBQtaco74 [OP] Member

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    I can’t remember where because I’ve been googling all evening, but I saw that it’s 12v. I think the charger isn’t very good.
     
  11. Dec 29, 2019 at 8:54 PM
    #11
    Speedfreak

    Speedfreak Well-Known Member

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  12. Dec 29, 2019 at 9:01 PM
    #12
    CAG Gonzo

    CAG Gonzo Ascendant Spaghetti

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    All vehicle circuits are 12v, with some exceptions like the dimmer circuit that are negatively grounded. Unless I'm mistaken.
     
  13. Dec 29, 2019 at 9:06 PM
    #13
    calebc

    calebc Well-Known Member

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    Not entirely true. Circuits can be stepped down. USB for example is 5v.
     
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  14. Dec 29, 2019 at 9:08 PM
    #14
    BBQtaco74

    BBQtaco74 [OP] Member

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    thanks for the diagram. I should have included in original post. I had found this, but I’m just not really sure what wires go where.
     
  15. Dec 29, 2019 at 9:10 PM
    #15
    Skydvrr

    Skydvrr IG: @kalopsianick

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    Even if it's ground switched, it could still be 12v.
     
  16. Dec 29, 2019 at 9:10 PM
    #16
    Skydvrr

    Skydvrr IG: @kalopsianick

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  17. Dec 29, 2019 at 9:12 PM
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    0xDEADBEEF

    0xDEADBEEF Where are we going? Why am I in this handbasket?

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    Looks like the switch is just an input to the wireless charger module. You should be able to rework that to switch a relay that will turn a USB charger on and off.
     
  18. Dec 29, 2019 at 9:17 PM
    #18
    CAG Gonzo

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    Right, but isn't the dimmer circuit less than 12v based on the dimming setting? Also forgot that USB circuits are 5v.
     
  19. Dec 29, 2019 at 9:26 PM
    #19
    mutely

    mutely Well-Known Member

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    it doesn’t look like the full power to the charging pad goes through the switch, it’s using the switch to tell it to turn on, then gets full power from a different circuit. So I’d be very dubious of running your USB PSU directly through that switch. You really should use a relay.
    If you add a relay, then run the coil of the relay blue wire, and the other side to ground, then the switch / contact side of the relay to the green wire, and the other side to the +12 on your usb psu. That should do it.
     
  20. Dec 29, 2019 at 9:32 PM
    #20
    Shellshock

    Shellshock King Shit of Turd Island

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    This seems like a whole lot of work when you could just replace the cig lighter with a dual usb plug or tap into the power for it and add ports wherever you want. I don’t see any point in having a switch for it..
     
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