ok, so I dont know if you have the clip for the sub with wires ( half of the harnes) or not......mine did, but anyway....
The pinout of the subs (on 02-03 mind you) looks like this.........
X X X P W
G R X O B
X = empty, or not used,
P = Purple (or Purple with brown stripe).............Left Rear (+)
W= White (or white with Brown stripe)...............Right Rear (+)
G= Grey (or grey with brown stripe)...................Ground
R=Red (or red with black stripe)........................(+) 12V Switched
O= Orange (or orange with black stripe).............Left Rear( -)
B=Black ( or black with brown stripe).................right Rear (-)
with that said, you need to make yourself your own wiring harness, and connect them accordingly......
the Subwoofers Red wire needs to connect to the Blue wire with the white stripe on the back of the radio harness
the Subwoofers Orange Wire needs to connect to the Red wire with the black stripe on the back of the radio harness
the subwoofers White wire needs to connect to the Blue wire with the yellow stripe on the back of the radio harness
The subwoofers Black wire needs to connect to the Red wire with the white stripe on the back of the radio harness
the subwoofers purple wire needs to connect to the white wire with the red stripe on the back of the radio harness
the subwoofers Grey wire needs to connect to the black wire on the back of the radio harness.
Now I must emphasize, this should apply to 02-03 WRX.....no garauntees are made otherwise, and I am not to be held responsible. your wiring is your wiring.
I used the crimpon tap connectors for all my hookups, as to not need to cut any wires behind the radio, for 3 bucks, its worth while.......
Feel free to ask any questions if need be....