ahhh so that means even if i did find a way of getting the Sony wired in it still wouldn't work?
Well, you'd need to adapt the speaker outputs to drive the Bose amp. Not sure if you can buy an off-the-shelf lead to accomplish this. In theory it's not that difficult...
Other option would be to remove the Bose system and replace with an atermarket amp and speakers but because Bose uses non-standard 2 ohm speakers you really would need to replace the whole shooting match. 
Kevin
In theory it could be done. However, thre are NO aftermarket adaptors to allow this that are commercially available, and due to the age of the vehicle now, its unlikely that any ever will be.
The biggest problem in trying to "adapt" something from the aftermarket units is the volume control itself on the head unit. If you have a volume control that "clicks" as it is rotated, or buttons that go up and down, then the volume will vary in predetermined steps, and these steps are too large for the BOSE amp to cope with - the result is that the volume is either all or nothing. Older stereos had a smooth rotary volume control in the form of a good old fasioned potentiometer, and whilst these gave good control at low volumes, if you turned the volume up too much it owould overdrive the BOSE amp and the whole thing would go bang again.
Options are:
If you want to retain the BOSE system, then the only option is an FM modulator, not the chinese ones, but a proper one. (I am currently evaluating one that also displays track info as well through any radio with an RDS display)
Or, if you want to go down the aftermarket route, then everything that is to do with BOSE will have to be replaced, none of it is compatable with the aftermarket units - and that includes the amp, the speakers and a fair bit of rewiring. Again, its all or nothing, but in my opinion, well worth the effort.
