you can get to the output side of the amp, or you can just turn the amp on at the harnes on the radio. The best thing to do ( or what I would do) is get yourself a tone generator. Look at the colors of the harnes at the back of the radio, then find those colors at tha amp. Then unplug the OTHER harness at the amp. Ythis will be the outputs from the amp to the speakers. 1 pair at a time, with the tone generator make the speakers talk to ya. A tone generator does just what the name implies. After you have identified all the "pairs" of speaker leads, you get to run wires from the outputs of the deck to the wires you identified at the amp outs. Use a DMM to ohm out the individual wires to make sure you get the polarity correct.   OR

Left Front Mid +	Lt.green/violet
Left Front Mid -	Lt.green/dk.green
Left Front Tweeter +	Yellow/red
Left Front Tweeter -	Yellow/black
Right Front Mid +	Lt.blue/violet
Right Front Mid -	Lt.blue/black
Right Front Tweeter +	Orange/red
Right Front Tweeter -	Orange/black
Left Rear Mid +	White/red
Left Rear Mid -	White/black
Right Rear Mid +	Tan/violet
Right Rear Mid -	Tan/black

heres for the coupe, the above is for the sedan!

Left Front Mid +	White/blue
Left Front Mid -	Black/blue
Left Front Tweeter +	Orange/blue
Left Front Tweeter -	Brown/blue
Right Front Mid +	White/red
Right Front Mid -	Black/red
Right Front Tweeter +	Orange/red
Right Front Tweeter -	Brown/red
Left Rear Mid +	Yellow/blue
Left Rear Mid -	Gray/blue
Right Rear Mid +	Yellow/red
Right Rear Mid -	Gray/red

Center Channel +	Orange/blue	Same line as for the left tweeter
Center Channel -	Brown/red	Same line as for the right tweeter