Subject: Re: [s-cars] RE: Help with an FM-modulated CD changer install

[Mike Platt]

I put a $200 12 disc JVC changer with RF modulator,
from Crutchfield, in my 1995.5 S6 avant two years ago
with no problems. I cut open the rear prewired round
cable and spliced in for switched power and ground.
The changer is mounted in the factory location with a
bracket I fabricated. I installed the RF modulator
under the steering wheel area and wired, poer and
ground, that into the CD changer output of the factory
deck. I figured I would use the decks grounds to
eliminate any noise problems. The switched power from
the deck also powers down the changer when I turn off
the factory unit. I mounted the controls with velcro
on the ashtray. Two years, sounds great. Didn't have
to fork out like $500 for the factory unit and I'm
happy with the results.

Mike P
<<<<

I'm probably just holding on that old feeling you used
to get when you 
received
schematics with your gear.  The factory heads have the
dash interface 
and why
shouldn't we be able to feed whatever line input we
want, be it a CD or 
iPod
or glovebox MD changer, and not have to throw away the
factory tuner.

The unknown for me remains how to use the line inputs
when you don't 
have an
existing CD changer.  My Gamma and Delta heads all
have a sticker that 
isn't
completely inscrutable (OK got power, line in,
ground).  Still no clue 
if the pins that
seem to be labeled serial data are what enables the
input or only send 
commands
and receive status.  I figger worst case is the
changer sends a magic 
50baudot char
when it powers up and the head activates that
subsystem ;)

I have a loose Delta that came from my avant when I
swapped the whole 
works
for a Sony head/changer setup.  If I had a magic
silver box + changer 
available
that would work, I could just slap an analyzer on the
unknown pins and 
record the
traffic; might be as simple as a -5v latch instead of
the usual 
automotive +12v.

Charlie


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