The LOC should have what looks like speaker wires and two female RCA outputs. You connect the speaker wires on the LOC to the speaker wires coming out of the head unit. You then connect a set of RCA cables from the LOC to the input on the amp. Then you run speaker wire from the output of the amp to the new crossovers.
Basically the radio will output the signal to the LOC which will send it to the amp, then to the crossovers, and finally the speakers.
I don't know what the color code is for the wiring harness on your car. If you search around the audio threads you might find it.
2008 Accord Coupe EX-L L4 Auto ASM
Clear bra | Tint | T-rex | Injen | Weapon R | Eibach | Enkei | Goodyear | SPC | H9/HIR | Hoen | LEDs | Clarion | JL | Focal | Python
1997 F-250 Crew Cab Diesel 4x4
Tymar | Diamond Eye | Bilstein | Clarion | Fosgate | JL