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Transponder key lost. How to bypass.

Discussion in 'Electronic Basics' started by Section 8, Jul 30, 2004.

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  1. Section 8

    Section 8 Guest

    The transponder unit inside a BMW uses a series of pulses sent to
    Engine Computer for verification. I like to record this signal and play them
    back on my desktop PC's music program. I've lost this key once and it
    cost $200US to get another. I will use a hand held tape recorder to
    record the series of pulses. How do I convert a data (electrical, 3vdc)
    signal into a usable sound waves using a microphone?

    Thanks
     
  2. dB

    dB Guest


    You will have to use the d.c. pulses to switch an audio signal on and
    off, and record that.
     
  3. It may not do you any good. If the BMW key uses a coding scheme similar
    to RF garage door openers (even the cheap ones), each transmitted code
    is unique and can't be replayed.
     
  4. Guest

    How do I convert a data (electrical, 3vdc)
    You don't. You use a suitable antenna and radio reciever.

    (It won't work, but you sound like someone who should be encouraged to
    waste your money trying...)
     
  5. Daniel Rudy

    Daniel Rudy Guest

    And somewhere around the time of 07/29/2004 23:34, the world stopped and
    listened as Section 8 contributed the following to humanity:
    I can point you to several places where you can get info on building
    one, but the problem is that sound has nothing to do with it. It's an
    RF signal that the transmitter sends to the vehicle. Each one sends a
    digitally encoded signal to the car, similar to a garage door opener.
    The signal is unique to the vehicle and cannot be played back,
    considering that some of these rotate frequencies and codes to help
    prevent theft.

    Your best bet is to drop the US$200.00 and get another one.
     
  6. Art

    Art Guest

    My adage is if he can afford the flippin BMW he can afford to purchase the
    correct item at the dealer.
    "Daniel Rudy"
     
  7. Daniel Rudy

    Daniel Rudy Guest

    And somewhere around the time of 07/31/2004 05:07, the world stopped and
    listened as Art contributed the following to humanity:
    Yeah, I have to agree with that myself.
     
  8. Herbert West

    Herbert West Guest

    Hmm... Makes me wonder if he even actually owns that BMW... <g>

    <snip>
     
  9. Daniel Rudy

    Daniel Rudy Guest

    And somewhere around the time of 08/01/2004 18:02, the world stopped and
    listened as Herbert West contributed the following to humanity:
    Now that you mention it, considering that he wanted to 'playback' the
    codes kinda makes me think he might be looking to steal one. But, what
    do I know.
     
  10. Art

    Art Guest

    Danny: Do you own a BMW and lost the access key?? Duh: LOL
    "Daniel Rudy"
     
  11. Metal Dave

    Metal Dave Guest

    You'll need to raise the volume on the transponder to 11 and push the
    unlock button really hard to get the microphone to pick it up.

    Dave
     
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