Sony CDX-S1000 adding a line=in!!!!

[alanwarwic]

I just bought a new car. It has a decent sony CD/Radio, however no line-in !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The schematic at http://www.eserviceinfo.com/downloa...S1000,2000.html
totally baffles/scares me.

My total guess is to add a switch to the sound control input (CD maybe).

Can anyone help with the correct way to tackle this problem