can you verify the polarity of the neutral wire? ppl have been reporting it as a 12 volt when neutral and others have stated it shows ground when neutral.
unfortunately, i don't have a manual wrx handy at this moment. the best way to verify this wire is to use a digital multimeter. hook the red probe to a true 12 volt source and using the black probe to test the ecu neutral safety wire. if the vehicle is in neutral and the multi meter says 12 volts, the neutral safety wire is Ground, if it shows 0 volts then the neutral safety wire is positive.
or the other alternative is to use the handbrake to the neutral safety wire and use a 12volt relay for the clutch bypass, ie:
Pin 86 ECU Neutral Safety Wire
Pin 85 Blue status output
Pin 87 one wire off the clutch switch
Pin 30 other wire off the clutch switch
When you iniate the remote start it will check the Black/White to see ground and then as long as the vehicle is in Neutral, the relay will connect the 2 clutch wires and the starter should crank.
Be sure to use a 1 amp diode with the silver ring facing Pin 86 to avoid a voltage spike.
Let me know what your findings are.