2006 pontiac pursuit new amp and sub

i have the Power and everything hooked up and running stable. the only thing i need is a signal to the amp to make everything work. I have the factory pioneer 4.1 system and have disassembled the dash and pulled the factor pioneer amp out, all i was told that i need to do is cut the end off the rca cables, and attach the cut ends to the wires that are dedicated to the stock sub going TO the amp not FROM. i was told that thi would save me from having to buy a line output convertor. I need help to know which wires are going TO the factory amp, and which of those power the stock sub's signalOPTIMUS PURSUIT Activate

Save yourself some trouble and purchase the appropriate line out converter.

it just stinks because they want 50-60$ for the box up here, i was looking for an cheaper and easier way to achieve a signal connectionOPTIMUS PURSUIT Activate