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Bluetooth speed sensor defeat circuitry

Discussion in 'Gen 2 Prius Accessories & Modifications' started by zenMachine, May 7, 2008.

  1. zenMachine

    zenMachine Just another Onionhead

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    After scouring the Speed Sensor Defeat Update thread and doing various other Google searches, I still couldn't find the information on how to build the circuit to defeat the BT speed sensor via the steering wheel's Off-Hook button. The link that was given by Brosnan appears to be broken.

    If anyone has this info tucked away somewhere, I'd appreciate it very much.
     
    #1 zenMachine, May 7, 2008
  2. zenMachine

    zenMachine Just another Onionhead

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    Found it. (Actually, I found Brosnan, who reposted it in the original thread).
    I'm adding the link here so that folks who come later might find the diagram quicker by not having to wade through that entire thread.

    http://www.wb5mrn.com/prius/bt_only_schematic.jpg

    Next question: would someone versed in electronics be interested in or willing to make these for sale?
     
    #2 zenMachine, May 8, 2008
  3. ilusnforc

    ilusnforc Member

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    The diagram says that it's for a 2004 Prius, does that mean it would or would not work on a 2006+?
     
    #3 ilusnforc, May 8, 2008
  4. Five5Six

    Five5Six New Member

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    hmm, looks interesting. I need to do some research.
     
    #4 Five5Six, May 8, 2008
  5. butchbs1985

    butchbs1985 Taking things apart is fun!

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    #5 butchbs1985, Jul 11, 2008
  6. aaf709

    aaf709 Ravenpaw of ThunderClan

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    It's very interesting, but since I don't need to use the keyboard that often, I'll stick with cutting the speed sensor wire and installing a switch.
     
    #6 aaf709, Jul 11, 2008
  7. butchbs1985

    butchbs1985 Taking things apart is fun!

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    I'm pretty sure that it will work on all Gen II Prius. An easy way to verify before cutting wires would be to cut some insulation off of the wire coming from the AU-2 switch (Pin 5b-2 of the wiring harness behind the vent just right of the stereo) and measure the voltages. You would just have to make sure that the voltages are such that would allow the flip-flop to trigger.

    If they do happen to be different than those posted by Brosnan, you could theoretically adjust the circuit to compensate using the two potentiometers.
     
    #7 butchbs1985, Jul 11, 2008
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