[s-cars] IR to RF conversion

[Theodore Chen]

yeah, you can do that.  it's the alarm that recognizes the remote, not
the other way around.  you can program both cars to recognize the same
remote.  but you have a different problem: how do you unlock just one car
if they're parked next to each other?

the one i bought has two channels.  you could each car to recognize one
of the channels.  then one button can be used to toggle lock/unlock
for each car.  it's an entry-level system.

or you can buy better alarms with more buttons, and set them up so there
are separate lock and unlock buttons for each car.

-teddy

--- chris chambers <fastscirocco_2000 at yahoo.com> wrote:

> teddy,
> 
> I have two 93 S4's and want to convert them both to RF. 
> 
> Do you know if this system will allow me to program both cars into both
> remotes. That way we could both have one remote that would unlock both
> cars?
> 
> Thanks
> Chris
> 
> 
> --- Theodore Chen <tedebearp at yahoo.com> wrote:
> 
> > > i'd like to convert it to RF, and was looking at the link that bill
> > > posted some time ago:
> > > http://www.mnsi.net/~natwhite/Audi/lock.htm
> > > http://www.mnsi.net/~natwhite/Audi/Images/audialarm.jpg
> > >
> > > has anybody here done this conversion?
> > > i'm also wondering why he used relays for the pin 4 and pin 3
> > connections.
> > > i understand he wanted to ensure that positive voltages never got
> > applied
> > > to the factory alarm inputs (which are expecting a negative
> > voltage), but
> > > why not use diodes?
> > 
> > i bought the prestige APS-25CH, which is similar to the APS-25KB 
> > recommended in the above link, but it has code-hopping and
> > double-pulse
> > unlock capability.  this latter feature is more important, as it
> > enables
> > you to eliminate one wiring connection and a relay.
> > 
> > instead of simultaneously triggering the unlock wire and disarm wire
> > as
> > in the above link, my APS-25CH triggers the disarm wire twice by
> > sending
> > two ground pulses.
> > 
> > the APS-25CH does indeed flip-flop as described in the link.  on its
> > unlock wire, it will send a ground pulse when you hit unlock, and
> > send
> > a +12v pulse when you hit lock.  so you need to make sure that the
> > 12v
> > pulse doesn't get through to the factory wiring.  instead of using
> > relays,
> > i used diodes.  59 cents a pair from radio shack, and i prefer solid
> > state
> > to electromechanical devices.
> > 
> > incidentally, the link is misleading in that there is no -12v line. 
> > it's
> > ground (zero volts).
> > 
> > my alarm has another channel that i was going to use to trigger the
> > window/sunroof close feature, which i disconnected after my central
> > locking
> > module started triggering it randomly.  however, the alarm only
> > provides
> > a short ground pulse.  the window/sunroof closing feature runs only
> > while
> > it's receiving a ground signal, so a short pulse does nothing.  does
> > anybody know of a relay with a short timer built in?
> > 
> > -teddy
> > 
> > 
> > 
> > 
> > 		
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> 
> 
> 
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