PR-BTHR001 - 2.0 WRX/STi Project Harness
Product Documentation
Project Wiring Harness Overview
Thank you for purchasing the iWire Project Wiring Harness. This overview is designed to give some general instructions on utilizing this harness. Please note that this harness does not come with a full step-by-step guide. It is intended for professionals only with lots of wiring experience. In this overview, you will find some suggestions for harness layout in the car as well as the wiring schematic for the harness. It is up to you to determine the best way to integrate this harness into your chassis of choice.
This kit is designed to modify the electrical systems in your vehicle. Working around electricity can be dangerous and even deadly if proper care is not taken. While iWire takes pride in making our products as simple as possible to use, we still recommend that a professional, qualified technician perform the installation. Any modification to a vehicle that exceeds the original manufacturer specifications carries an inherent risk of mechanical failure that could result in damage to life or property. iWire is not responsible or liable for any damages that may occur. By purchasing this product, you agree to these terms of sale.
General Harness Layout
The overviews below show the basic layout for the harness in the car. Since this is a DIY project harness, you can run the wires in any manner you like however this layout shows the routing the harness was designed for.
Applicable Wiring Diagram
Empty Leads Overview
ECU Pin Location | Description | Additional Notes |
|---|---|---|
E22 LgB | Pressure Control Solenoid Valve | Ground output to the valve |
E11 BrY | Drain Valve | Ground output to the valve |
E10 BR | Constant Power | Battery Power Input for memory save |
E15 RW | Check Engine Light | Sends ground when the check engine light is on |
E27 Br | AC Relay | Ground output to the AC compressor relay when A12 gets 12V for the AC request |
E17 RL | Radiator Fan | Ground output to trigger radiator fan |
E28 GR | Radiator Fan | Ground output to trigger radiator fan |
E23 RL | Fuel Tank Sensor Control Valve | Ground output to the valve |
D9 G | Tachometer | Pulsed output |
B25 BrW | Fuel Level Sensor | 0-5 volt reference requires pull up from cluster to convert resistance of level senders into voltage |
B6 LB | Fuel Temp Sensor | 0-5v input (ECU pull-up) |
B15 GOr | Fuel Tank Pressure Sensor Pin1 | 0-5v Input |
A1 GY | Vehicle Speed Sensor | Requires a digital signal |
A2 LY | AC Evap pin 2 | 12V input tells the ECU that the AC is being requested. Ground output on E27 for the compressor relay |
A3 L | Defrost | ECU adjusts when defrost is on |
A8 GB | Neutral position | Ground output from the transmission to determine in or out of gear |
A9 GR | AC Switch | ECU adjusts when the AC switch is pressed (this is not the trigger for AC) |
A6 LgW | Main Relay Trigger | 12V output from ECU to the main relay to turn the Main Relay on |
A10 RW | OBD Pin 6 | It can run through the initialization connector, or it can go directly to OBD2 |
A14 Or | Test Mode | Ground input when in test mode |
A16 Y | Starter | Sensing wire for cranking. Tie into the large gauge wire used between the starter switch and the starter trigger |
A17 BW | Illumination | ECU adjusts when the lights are on |
A20 YG | OBD Pin 8 | It can run through the initialization connector, or it can go directly to OBD2 |
A21 LgB | OBD Pin 10 | ECU to OBD Communication Wire |
LW | Fuel Tank Pressure Sensor | Signal ground - Ties into shield joint gound that is fed by ECU pin B19 RG |
Sb | Fuel Tank Pressure Sensor | Comes from 5v output on pin B9 |
D15 VW | Fuel Pump Controller Signal 1 | Fuel Pump Controller Pin 8 |
A13 LgR | Fuel Pump Controller Signal 2 | Fuel Pump Controller Pin 9 |
YR | Main Relay Output | 12V Power for front and rear 02 |
YL | Main Relay Output | 12v Power for Boost Control, Injector (F60 Pin 1), ECU (E2/E3), MAF, Gast Tank Valves |
GR | Ignition Power | 12V key on input to the ECU (A5) |
BR | Engine Ground | Ground from the intake manifold (F60 Pin 16) to ECU (A7, A15, C1), Neutral Position, VSS, OBD, Test Mode, Fuel Level |
GW | Oil Pressure | Ground without oil pressure. |
WG | Coolant Temperature | 0-5 volt input from the sensor on the engine (resistance-based with pull-up from the cluster) |
L | TPS Signal | TPS input to connect to DCCD |