[s-cars] Dang - Broke My IR Key - '92S4 - Need IR to RF instructions

[Theodore Chen]

mike,

i'm the guy who posted as AEIOUsometimesY.  the APS25CH is
the same as the APS25KB but has code-hopping as well as
double-pulse unlock (allowing you to leave out one of the
connections in the original diagram).

using the diodes is simple.  connect the alarm outputs (red
for lock pulse, green for unlock pulse) to the central
locking/alarm unit as shown, but replace the two leftmost
relays with diodes.  you don't need the third connection
(to pin 5 green/blue on the central locking unit) because
the APS25CH is capable of sending a double pulse to unlock
all doors.

so the connections are:
red (lock pulse) to diode to pin 4 brown/grey
green (unlock pulse) to diode to pin 3 brown/green
power connections as indicated in original diagram

remember that these are (-) pulses, so the diode should
be aimed toward the alarm unit (there should be an arrow
on it indicating polarity).

if you look at the original diagram, it's obvious that the
original poster was using the relays as diodes.  i don't
know why he used relays instead of diodes, which are cheaper,
solid state (more reliable), much more compact, and easier
to wire.  the diodes do produce about 0.6v drop in the
forward-biased direction, but with 12v being supplied, 
this shouldn't make much difference.

i have to admit that i did my wiring with scotchlocks
because i wanted to test it first before hacking up the 
wiring.  i never did get around to soldering the connections, 
but now i'm getting some flaky behavior.  the car doesn't
always lock the doors when i press the remote button.  it 
unlocks reliably, though.  i'll be going in there to solder
the connections properly, and maybe i'll figure out how to 
close all the windows and sunroof with the other remote 
button.  

i can't remember the original behavior of the auto-close 
feature: did you have to hold the key continuously
to keep everything closing, or just for a second or two?
in other words, if you turn the key and hold it there, the
windows and sunroof start closing.  if you then release the
key, do the windows and sunroof stop moving?

-teddy

--- Mike Bishoff <mdbishoff at comcast.net> wrote:

> Thanks James! This is an excellent idea. I noticed in the audiworld thread
> that user "AEIOUsometimesY" made adjustments to the original 3-relay scheme
> and instead used a slightly different alarm module as well as inline diodes.
> 
> Does anyone have the updated schematic using the diodes and the Prestige
> APS25CH alarm?
> 
> Mike - Seattle, WA
> 
> -----Original Message-----
> From: James Murray (QA/EMC) [mailto:james.murray at ericsson.com] 
> Sent: Monday, January 23, 2006 9:42 AM
> To: Mike Bishoff; s-car-list at audifans.com
> Subject: RE: [s-cars] Dang - Broke My IR Key - '92S4
> 
> Upgrade to RF... It's way better IMHO:
> 
> http://forums.audiworld.com/a6100/msgs/20147.phtml
> 
> /Jamu. 
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Mike Bishoff
> Sent: Monday, January 23, 2006 12:39 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] Dang - Broke My IR Key - '92S4
> 
> After 112k miles, my main IR key broke in half - the actual metal part.
> Fortunately I was able to get the broken piece out of the lock without
> any problems. As I recall, new keys are in the $100+ range or more at
> the dealer and I'm hoping for a lower cost solution.
> 
>  
> 
> Any "secret" source of IR blank keys for my '92 S4?
> 
>  
> 
> Mike - Burien, WA
> 
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
> 
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com