Maker Pro
Maker Pro

Transponder key lost. How to bypass.

S

Section 8

Jan 1, 1970
0
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
 
D

dB

Jan 1, 1970
0
Section 8 said:
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


You will have to use the d.c. pulses to switch an audio signal on and
off, and record that.
 
P

Paul Hovnanian P.E.

Jan 1, 1970
0
Section said:
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?

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.
 
How do I convert a data (electrical, 3vdc)
signal into a usable sound waves using a microphone?

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...)
 
D

Daniel Rudy

Jan 1, 1970
0
And somewhere around the time of 07/29/2004 23:34, the world stopped and
listened as Section 8 contributed the following to humanity:
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

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.
 
A

Art

Jan 1, 1970
0
My adage is if he can afford the flippin BMW he can afford to purchase the
correct item at the dealer.
"Daniel Rudy"
 
D

Daniel Rudy

Jan 1, 1970
0
And somewhere around the time of 07/31/2004 05:07, the world stopped and
listened as Art contributed the following to humanity:
My adage is if he can afford the flippin BMW he can afford to purchase the
correct item at the dealer.

Yeah, I have to agree with that myself.
 
H

Herbert West

Jan 1, 1970
0
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.

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

<snip>
 
D

Daniel Rudy

Jan 1, 1970
0
And somewhere around the time of 08/01/2004 18:02, the world stopped and
listened as Herbert West contributed the following to humanity:
Hmm... Makes me wonder if he even actually owns that BMW... <g>

<snip>

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.
 
A

Art

Jan 1, 1970
0
Danny: Do you own a BMW and lost the access key?? Duh: LOL
"Daniel Rudy"
 
M

Metal Dave

Jan 1, 1970
0
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?

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
 
Top