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

Thu Jan 26 12:44:42 EST 2006

Hi Teddy - Glad to track you down! This sheds quite a bit of light on your
posting lo those many years ago. :-)

I'm picking up my APS25CH today and I have one question about its operation.
The Audiovox instructions online are horrible. When you do the double-pulse
unlock - is this by pushing the remote button twice in something like a
second or two? Probably so, but wanted to check. I guess it must then send a
double positive or double negative depending on the system you're working
with - negative in our case.

Your explanation of the diodes makes total sense and I suspected that's what
you were talking about. The diodes need to block a positive pulse and
therefore the arrow is pointing away from the APS25CH as you stated.

But I'm wondering why the alarm disarm is not needed. Is that because the
doorlock pulses also disarm the alarm inside the Audi controller?

As you noted, the diodes are the way to go, but with the issue of the
double-pulse not being available, the two relays used to open all the locks
was clever enough. I wouldn't know how to do that with just diodes since
they would be always working against each other. I think!

Regarding the windows - yes, you must hold the key in continuously until all
the windows are closed on the 92-93 S4s. Not sure about other models. So
that will be quite the challenge. You'd probably have to hold the button the
remote down continuously and that *might* work. Or optionally
push/release/push, etc until the windows are closed. That would be annoying.
Holding continuously would be ok.

Good stuff! I'll make sure to solder my connections. :-)

Mike

-----Original Message-----
From: Theodore Chen [mailto:tedebearp at yahoo.com] 
Sent: Wednesday, January 25, 2006 11:51 PM
To: Mike Bishoff; 'James Murray (QA/EMC)'; s-car-list at audifans.com
Subject: RE: [s-cars] Dang - Broke My IR Key - '92S4 - Need IR to RF
instructions

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
> 
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> 
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