Take a look at
This is probably your best hope.
have looked on , and searched this forrum, and hevent had much luck.
does anyone know if its possible to get an aux in on a vauxhall corsa stock HU, model is cdr 2005, as i havent seen anything im guesing not, but juct wana check first.
If you can post the pic of a backside of your HU I can help.
Car pc integration with ease
I had to modify my stock Corsa headunit for aux-in. It's a CAR300. Schematics for mod on my site.
Old Systems retired due to new car
New system at design/prototype stage on BeagleBoard.