Getting Started First I have to say there`s not nearly

Getting Started
First I have to say there's not nearly enough documentation on the OEM radio and pinout on the
interwebs and while there are a lot of forum posts talking about this project I couldn't find one that
really brought it all together in an easy to follow complete manner. After a few days of fairly intensive
searching I think I've pulled together enough information to give this project a shot.
***WARNING***
Attempt at your own risk. I take no responsibility for damage to personal property OR personal injury
resulting in attempt to complete this project.
Documentation Found
This car came with XM radio and there was a trial period of a little less than a month after buying the
car. While XM radio is a pretty nice service, I can't justify the subscription cost for something I use less
than an average of 2 hours a day. Even if the car hadn't come with the XM receiver, I think the factory
radio would still have the 14 pin connector used for XM. This connector might also be used for trunk
mounted disc changers, but I'm not sure about that. After some searching I was able to find this pinout
for the XM connector that someone uploaded to install bay at www.the12volt.com.
OEM Radio XM Connector
A quick Google image search will show you that the tip of an aux cable is the Left channel, the next
rung is the Right channel, and the final rung is Ground. I picked up a 5 pin 1/8" audio jack from radio
shack for less than $3, part number 274-246. Below is a schematic representation of the jack to be
used.
Aux Jack Pinout
Note that with out an audio cable plugged in pins 2 and 3 are shorted together as are pins 4 and 5.
When an audio cable is inserted in the jack the cable makes connections to pins 1, 2, and 5 or Ground,
Right, and Left signals.
Experimentation/Install
Connection Through XM Radio
The second setup will attempt to tie in the aux jack along with XM radio. If you're going to attempt this
project I recommend buying a wiring harness to go between the XM connector and the Head Unit plug.
You should be able to find on online for a couple bucks. I don't plan on using XM so I cut the factory
harness. If I ever want to use XM I'll just open the console back up and rewire the connection. First I
cut the R+ and L+ wires only. When I turned the radio on with the aux jack plugged in I could still hear
the XM radio. When I turned the radio up I could hear that there was music coming through the aux
jack too. I then cut the R-, and L- wires on the connector and left those disconnected.
Factory XM Harness Cut
Now when I turned on the radio I could hear the music from the aux port pretty well. One thing to note
is that the music from the aux jack came through a little softer than the radio or CDplayer, but the
quality is still good. Here's the connection schematic.
Aux Jack Connection Through XM
After taking a little road trip I decided I wasn't happy with the softer sound when using the aux port.
So I opened the dash back up and tried a couple things. First I connect the L+ and L- pins together
from the Aux port going back to the Radio. This just made the sound even softer, barely audible even.
Then I connected the L- to Ground and noticed that the sound seemed to get a little better. So I tied
both L- and R- to Ground and sealed everything back up.
Full Connection Schematic
There are a couple more features I've thought about adding, but have not done so yet. First if you
wanted to keep the ability to use XM Radio you could easily add a 4PDT (4 Pole Double Throw) switch
to this circuit as shown here.
Full Connection Schematic With XM/Aux Switch
These switches come in varying styles, sizes, and prices. You can find them at Digikey.com among
other places. You just have to figure out what works best for you.
The other addition I was considering is some kind of ground loop isolation. I've noticed that when I
connect my phone to the Aux jack with the charger plugged in I get some humming/buzzing. It's not
really noticeable unless I'm listening to something really soft that I have turned up a good deal. I need
to do some more research on this option before I decide to go ahead with it or not.
S podekovanim autorovi prevzato z:
http://www.driveaccord.net/forums/showthread.php?t=57460