Here's a diagram for an 03....should be the same
12volts BLACK/ white to white + ignition harness
Starter BLACK / YELLOW to WHITE/ blk + ignition harness
Second Starter N/A
Ignition black to green + ignition harness
Second Ignition N/A
Third Ignition N/A
Accessory BLACK/ blue to yellow + ignition harness
Second Accessory N/A
Keysense WHITE/ red + ignition harness
Power Lock RED / white - keyless entry module
Notes: The keyless entry module is to the left of the steering column.
Power Unlock yellow/red - keyless entry module
Notes: The keyless entry module is to the left of the steering column.
Lock Motor lt. GREEN/ black to orange 5wi driver kick, door harness
Unlock Motor RED / white to red 5wi driver kick, door harness
Parking Lights+ orange + headlight switch
Parking Lights- BLACK/ white - headlight switch
Notes: The negative parking light wire only functions with the ignition on.
Hazards same as turn signals
Turn Signal(L) BLACK/ green + steering column
Turn Signal(R) lt. GREEN/ black + steering column
Reverse Light BROWN / yellow + driver kick, harness to rear
Door Trigger yellow - keyless entry module
Notes: The keyless entry module is to the left of the steering column.
Dome Supervision use door trigger
Trunk/Hatch Pin yellow/red - keyless entry module
Notes: The keyless entry module is to the left of the steering column.
Hood Pin N/A
Trunk/Hatch Release N/A
Power Sliding Door N/A
Factory Alarm Arm factory remote only
Factory Alarm Disarm factory remote only
Disarm No Unlock factory remote only
Tachometer green ac instrument cluster or ECM
Notes: The ECM (Engine Control Module) is behind the passenger side dash.
Wait to start N/A
Brake Wire WHITE/ black + brake pedal switch
Parking Brake pink - parking brake switch
Horn Trigger RED / green - steering column
You have a 5 speed I assume?? One thing that is great about the WRX is the cars ECU had a wire called a Neutral Position Sensor. It can be tied into a remote starter so the car will only remote start in neutral. If interested, I could explain how it could be done.
Check out http://forums.nasioc.com/forums/ for info on the car.
I have an 02 that was almost totaled last week. Sideswiped pulling into my work. Second time I've been hit in 5 months, so I'm going to get rid of it after its fixed. I think its jinxed.
Here's an old post I did on the WRX last year.
Any specific wiring questions on the car?....I probably know the answer.