I'm trying to add auxiliary port to my stock stereo - accord 90'

I got the idea from this page: http://donn.dyndns.org/projects/carstereoinput/

basically you solder headphone cable to audio processor of stereo


I opened the top of the stereo and here's what it looks like:
http://img688.imageshack.us/img688/9562/img0356hrb.jpg
hold ctrl + scroll to resize image

on the green pcb, there are three black chips. I think the audio processor is the biggest one which on that pic is the one at the bottom.

I googled the letters that are on that chip and it let me to this page:
http://pdf1.alldatasheet.com/datashe.../BA6285FP.html

scroll down to page 2 of the pdf document and you'll see a diagram labelled "ba6285fp"

pink 17 and pin 19 are frontIN and rearIN
so i have to connect the headphone cable to those two pins

where i'm stuck is, where to solder the headphone cable to.

like i don't know which 'bump' on the pcb those two pins are connected to.

any help is appreciated

 

i was just talkin to a friend who is a computer engineer and after looking at the pdf, he said that chip actually controls the cassette deck.

so I took off the casstte deck and that green pcp board and under it is the black pcb board. Thats where the actual audio processor chip is.

here's a pic:
http://img295.imageshack.us/img295/8166/img0357o.jpg
ctrl + mouse wheel to resize

I think the audio processor is the one in bottom right hand corner with blue paint all around it. Its made by alpine and the model number is "51T95037W02"

so now Im trying to figure out where to solder the cable. I'm looking for rightIN and leftIN.

Google didn't help me this time. All results were either to chinese or russian websites.
there are some more pics here if you scroll down: http://bbs.carcav.com/read.php?tid=259114


My friend suggested to track where the cassette deck transmits the audio signal through and solder the cable there (since i took out the cassette deck)
If you look in the pic, there is a long creamy coloured bus in the top left corner of the picture. That is where the pcb board that controlled the cassette deck goes into. So out of those 20 pins, 2 are probably rightIN and leftIN.


any ideas?



edit:
did some more digging online and found this
model#:CM728AC
tuner: US-EU
part number: 39100-S10-A310-M1
manufacturer: ALPINE
MCU: 51T95037W02 661


I tried a bunch of datasheet websites and search but couldn't find anything. :s

 

Does the 90 accord stereo have the option to have a CD player installed? On the back of the stereo, there would be an 8-pin DIN connector to plug it into.

Here is what it would look like:

 

no it doesnt have an 8-pin DIN connector

this is how the stock honda cd player connects to it: