Re: remote entry -key fob programming

"Bill Putney" <bptn@[EMAIL PROTECTED]
> wrote in message
news:5uqborF1ia8mfU1@[EMAIL PROTECTED]
> maxpower wrote:
> > "Bill Putney" <bptn@[EMAIL PROTECTED]
> wrote in message
> > news:5ugobdF1hli1fU1@[EMAIL PROTECTED]
> >> MoPar Man wrote:
> >>> maxpower wrote:
> >>>
> >>>>> I have a 1999 Plymouth Voyager and my wife has a 2000 Dodge
> >>>>> Caravan.  Is it possible to program my key fob so that it will
> >>>>> also open my wife's car?
> >>>> No
> >>> It's not the fob that's programmed.  It's the computer in the
vehicle.
> >> Though you might be right, that seems counterintuitive.
> >>
> >> I have two 2nd gen. LH cars sitting in my driveway that use fobs of
the
> >> same part number.  If I took the fob of car no. 1 and followed the
> >> programing procedure using car no. 2 and its fob, then both fobs
would
> >> control car no. 2, and car no. 1 would no longer respond to either. 
If
> >> what you're saying is true (that it is the car's computer that gets
> >> programed), that doesn't sound possible.  Or would in fact both cars
> >> respond to what was car no. 1's fob after the reprograming?
> >>
> >> Bill Putney
> >> (To reply by e-mail, replace the last letter of the alphabet in my
> >> address with the letter 'x')
> >
> > The RKE system and transmitter use a rolling code method for
transmitting
> > the information . Rolling code is a method used to provide extra
security to
> > a transmitted signal. The transmitter sends a randomly selected
sequence
> > code each time a signal is sent. The code increments vary depending on
a
> > unique algorithm that is preprogrammed to each transmitter at the time
it
> > was built. The sequence changes each time the transmitter is used. (
If
a
> > scanner is used to try to pick the signal up it can not be duplicated)
> > because the sequence code cannot be calculated from the encoded
> > transmission. The receiver module also learns the transmitter id code
and
> > initial sequence code at the time of transmitter programming. The
receiver
> > then expects the next transmitted sequence code to increment within a
> > predetermined range of numbers
> > Each Transmitter has its own code and the code is programmed and
stored
into
> > the receiver memory. The newer key fobs transmit a unique rolling 
code
id
> > message to the RKE module. Transmitters and receivers are unique to
each
> > vehicle line and will not work.
>
> Thanks, Glenn.  So, if I read that right, my two LH cars sitting in the
> driveway could not be programmed to simultaneously both work with the
> same remote?
>
> Bill Putney
> (To reply by e-mail, replace the last letter of the alphabet in my
> address with the letter 'x')

I cant see how you could defeat the system to allow it to work