2002 Nav radio, Hardwiring aux input via cassette

[hellspcangel911]

Hi All,
Recently purchased an X5, long story but it looks like my MKIII died. The radio still produces sound but the screen is dead.

Full story here:
http://www.xoutpost.com/bmw-sav-foru...tml#post975562

Before I pull the trigger on repairing the MK3, replacing it with a MK4 or going full aftermarket, I need to quickly add a aux input.
FM modulator is out of the questions because I cant read the screen and my antenna doesnt work. Without the screen I also cant access the CD changer. Since its an older model (made late 2001) there is no Aux connector behind the headunit - that would have been too easy.

So I've decided to try and hardwire into the cassette leads. This would be easy if it didnt have the Nav 16:9 screen i could just follow these simple instructions.
https://www.bimmerfest.com/forums/sh...d.php?t=638814

I took the headunit apart and our boards are different. I dont see how to hardwire in the the tapedeck board and I dont want to risk hacking the main board as its very tight.

So I started looking at the pinouts and schematics and since the amp and brain are are actually in the trunk, its my understanding that the tape audio must be sent, analog, from the headunit, to the trunk.
These pinouts would lead me to believe if I cut into pins 1, 2, 6, 7 on connector X18805 and wired a 3.5M jack, I would have a Aux in.
http://www.xoutpost.com/articles/x5/...formation.html

Does anyone have a pinout diagram of the two connectors on the back of the screen?
If this theory is true I could wire in the 3.5M jack in the cabin directly so when a cassette is played the audio from the aux would be played instead. The aux would be slip streamed into the amp...

Anything I overlooked?

[hellspcangel911]

Found what I needed on bmwtips.com:
"Locate the two Twisted pair wires (yellow=right channel, blue=left channel) from the blue connector wiring harness. We decided to cut these wires (leave enough length to reverse the process) so that any noise from the tape source is eliminated. Connect RCA(left and right) cables to these wires."
Can anyone explain why if you do this you need to install a line driver but it works fine using a cassette adapter?

[victell]

Bump. Im also looking to hardwire an aux-in for my early 2002 X. Has anyone hardwired their system this way? Or any other way?

[chivas]

Get GROM... makes life SOOOOO much easier. It does bluetooth and shows the titles and everything else for music. Makes your system a handsfree system too! Oh, did I mention it does USB?? can also get the iPod cable and drop one in the trunk; it'll play and charge the iPod. slick system.