Just for future reference... decided to try above and works flawlessly
opted to go via using the PHONE pins on rear of unit
so now i can connect my ipod also i can connect my mobile and use it perfectly either to stream music or as a handfree device... ill detail all that i did below
first thing i did was found a pin out diagram for the original stilo / cassete headunit see below pic 1 below
then proceeded to make find a switch that would connect to pins 9 and 12 and when toggled would initiate the phone input
then i found my unused headphone that came with my nokia 1320 that has a microphone on aswell, then opened up microphone area.
desoldered 4 x cable for right and left ear phone then attached 4 x speaker wire lengths to pcb were old headphone wires were. SEE pics Below
then bridged left and right + and - channels into one, so i was left with only 1 + and - wires, these were in turn attached to 2 pins ( used orange connector pins from when i soldered my airbag connection whilst sorting airbag fault)
SEE pics Below
then i attached my home made 3.5mm lead to 2 x pins into rear of headunit via pins 7 & 8 on section C
Testing time:
Flicked toggle switch, head unit then displays The following PHONE
SEE pics Below
attached phone to 3.5mm jack and pressed play
Headunit now plays Music through 3.5mm jack perfectly... :slayer:
now decided to see if my thinking on if it would also work well as a handfree device via build in microphone would also work, so called my partner... her voice bellowed out via the cars speakers and she could also hear me perfectly
Success
apart from now ive got no excuse for not answering my calls whilst driving
then sleeved cable with some cable braid and headshrink i had lying about and then reinstalled and had microphone in position that i wanted it to be in car
SEE pics Below
Hope this Guide of use to someone... Cheers