*This post contains affiliate links. That means that if you make a purchase after clicking on a link I may earn a small commission at no extra cost to you. "As an Amazon Associate, I earn from qualifying purchases.” Click here for more Info.

Subaru Wiring Harness Diagram

Subaru Wiring Harness

A Subaru wiring harness diagram provides the schematic for the electrical connections of a Subaru vehicle. It gives information on which components are connected to each other and where they are located in the car. It typically includes wire colors, type of connection (connector or un-spliced), and connector pinouts.

Read More About Subaru H6 Engine Diagram

The diagrams also indicate how power flows through circuits, and identify fuses, relays, and grounds. With this knowledge, it is possible to troubleshoot electrical problems in a Subaru vehicle with ease as well as make modifications such as adding accessories like fog lights or aftermarket audio systems.

Subaru Engine Harness Connectors

Subaru engine harness connectors are essential components of any Subaru engine and serve as an interface between the wiring harness and various electrical components.

They ensure reliable, secure connections that prevent shorts or other damage to the system. Engine harness connectors come in a variety of shapes, sizes, and colors, depending on their application.

Each connector must be attached properly for optimal performance; otherwise, it may cause additional problems like misfires or reduced power output.

Subaru Engine Harness Replacement

Replacing the engine harness in a Subaru vehicle can be a complex and time-consuming process. It is important to ensure that all components of the system are properly connected and secured before attempting this repair.

Specialized tools may be required for certain parts, so it is recommended to consult with an experienced automotive technician for assistance if you are not comfortable performing this task yourself.

Additionally, make sure to use only genuine Subaru-approved parts when replacing your engine harness as aftermarket parts could cause additional problems down the line.

Subaru Wiring Diagram Color Codes

Subaru wiring diagrams typically use the following color codes to indicate wire function: black is ground, brown is constant 12V power, blue/white stripe is accessory switched 12V, light green/black stripe is illumination or dash lights (switched), yellow/red stripe is primary injector signal and orange/white stripe is secondary injector signal.

For air conditioning systems, white wires are usually for fan motor control and gray wires for compressor clutch control. Additionally, red wires may be used to represent a +12V power supply while green may represent a -a 12V power supply.

Finally, purple and violet are data bus lines often found in OBD-II systems.

Subaru Impreza wiring diagram 

Read Also Subaru Engine Swap Compatibility Chart

What is Wire Harness Layout?

A wire harness layout is a diagram that shows the connection between various electrical components in an electronic device. It can also be referred to as wiring diagrams, cable schematics, or schematic drawings.

The main purpose of a wire harness layout is to provide an easy-to-follow roadmap of how each component should be connected and arranged within the system.

The layout includes details such as which wires are used for different connections, where connectors need to go, and what type of insulation needs to be applied if any. By having this information readily available, it makes troubleshooting easier for technicians when something goes wrong with the electronics.

How Do I Know What Wiring Harness I Have?

To determine the wiring harness you have, it is important to first identify which type of vehicle it is for. Different vehicles require different types of wiring harnesses, so knowing your specific make and model can help narrow down the selection.

Once that information has been established, you can look at the parts number on the existing wiring harness to see if it matches up with a known OEM part or aftermarket part in your vehicle’s application.

Additionally, many online stores also provide diagrams and pictures of their available wiring harnesses so you can compare them to what you currently have installed in your car or truck. What are the Symptoms of a Bad Wiring Harness?

A bad wiring harness can cause several symptoms, including erratic engine performance, starting difficulties, electrical faults such as short circuits and blown fuses, and incorrect readings from vehicle sensors.

Other signs of a failing wiring harness include dim or flickering headlights, buzzing sounds coming from the dashboard or other electrical components, battery drain due to high current draw when no load is present, and an illuminated “check engine” light on the dashboard. In summary-

  1. Electrical problems: A bad wiring harness can cause electrical issues such as shorts, blown fuses, and intermittent or non-functional electrical components.
  2. Dim or flickering lights: Faulty wiring can cause lights to dim or flicker while driving, which can be a safety hazard.
  3. Engine misfires: A faulty wiring harness can cause the engine to misfire, resulting in rough idling, poor performance, and reduced fuel efficiency.
  4. Stalling or failure to start: A bad wiring harness can prevent the engine from starting or cause the vehicle to stall while driving.
  5. Overheating: If the wiring harness is damaged or worn, it can cause the electrical system to overheat, leading to potential damage or failure of electrical components.
  6. Burning smell: A burning smell inside the vehicle or under the hood could be an indication of a wiring harness problem.

Can You Replace a Car Wiring Harness?

Yes, you can replace a car wiring harness. Replacing the wiring harness in your vehicle is not as difficult as it may sound and can be done with basic tools. First, you will need to identify which type of wiring harness needs to be replaced by consulting your car’s manual or speaking with an auto parts store employee.

Once you’ve identified the correct part, you’ll want to disconnect the negative battery cable and remove any other components that might interfere with access to the old wiring harness before beginning.

After that, unplugging and removing any existing wires from their connectors before undoing all screws holding the old wiring harness in place should be next on your list of tasks. 

ej25 wiring harness diagram

subaru 28 pin harness diagram

Subaru Legacy VW Wiring Harness Conversion


In conclusion, the Subaru wiring harness diagram is an invaluable tool for anyone working on a Subaru vehicle. It provides detailed diagrams and instructions that make it easy to understand how the components of the electrical system work together.

With this knowledge in hand, you can confidently diagnose and repair any issues that may arise with your Subaru vehicle’s electrical systems.

Similar Posts