Tape to AUX ...Help

Can anyone get me the wire diagram for a stock head unit of the 95 nissan maxima GLE ( it IS a BOSS system).  It is the SINGLE cd player with tape deck.  What I want to do is find the wire(s) on the back of head unit that is the tapes out put going to the amps, and splice in my own source.  So when I select "TAPE" with the button on the stock headunit it actually activates what ever i hook into it via red and white (or red and black) audio cables. In this instant, its xbaox in my car.  Is this possible, becasue it makes perfect sense to me.  Very simple logic, just change source and trick audio system.  I dont care about no more tape playing so dont worry bout that                  

Tape selector now becomes "AUX" option like on an after market head unit.

So i need a diagram of that clip(s) that comes out back of cd/tape unit  so i can locate all wires i need to tap into (ones from tape)

Also need to no name of device to switch signals from say tape deck to the audio cables.

Thanx