2015 Subaru Impreza Fuse Box Diagram

Alright, let's dive into the fuse box diagram for the 2015 Subaru Impreza. This document is your roadmap to electrical troubleshooting, modification, and general understanding of your car's inner workings. Forget expensive shop visits for simple electrical issues; with this diagram, you'll be well-equipped to diagnose and fix many problems yourself. We're focusing on the 2015 Impreza specifically, as fuse box layouts can vary between model years. Keep in mind that slight variations may occur based on trim level and options installed on your vehicle.

Purpose and Importance

Why bother learning about the fuse box? The answer is simple: it's the central hub for electrical protection in your Impreza. Fuses are designed to be the weakest link in an electrical circuit. When a circuit experiences an overload – say, due to a short circuit or a faulty component – the fuse blows (melts), interrupting the flow of electricity and preventing damage to more expensive components like wiring harnesses, control modules, and even the engine computer (ECU). Without fuses, even a small electrical problem could lead to a major fire. Understanding the fuse box diagram empowers you to:

Troubleshoot Electrical Issues: Is your radio dead? Headlights not working? The fuse box is the first place to check.
Perform Safe Modifications: Adding aftermarket accessories like auxiliary lights or a subwoofer? Knowing the fuse box layout is crucial for tapping into the correct circuits and protecting them properly.
Learn Your Car's Electrical System: Understanding the fuse layout gives you a better grasp of how the various systems in your car are powered and protected.
Save Money: Avoid unnecessary trips to the mechanic for simple fuse replacements.

Key Specs and Main Parts

The 2015 Impreza typically has two main fuse box locations:

Under-Dash Fuse Box: Located inside the cabin, usually on the driver's side, near the lower dashboard. This box houses fuses for interior components like the radio, lights, windows, and climate control system.
Engine Compartment Fuse Box: Situated in the engine bay, often near the battery. This box protects critical engine-related systems such as the fuel pump, ignition system, ABS (Anti-lock Braking System), and cooling fans.

Key components you'll find in and around the fuse boxes include:

Fuses: These are the sacrificial elements that protect the circuits. They come in various amperage ratings (e.g., 5A, 10A, 15A, 20A, 30A) indicated by numbers printed on the fuse. Common types include blade fuses (ATO, mini-ATO) and cartridge fuses.
Relays: Electrically operated switches that control high-current circuits, such as those for headlights, fuel pump, and starter motor. Relays allow a low-current signal from a switch or control module to activate a high-current circuit.
Fuse Puller: A small plastic tool included in the fuse box to safely remove fuses without damaging them.
Spare Fuses: Typically, the fuse box will have a few spare fuses of various amperages for emergencies.
Fuse Box Cover: This cover protects the fuses from dirt and moisture. It usually has a simplified diagram printed on the inside, but it's less detailed than the full diagram we're discussing.

Understanding Fuse Box Symbols

The fuse box diagram uses symbols to represent different components and circuits. Here's a breakdown of common symbols you'll encounter:

Lines: Solid lines represent electrical conductors (wires). The thickness of the line doesn't necessarily indicate wire gauge in these simplified diagrams.
Colors: While the diagram itself may not be in color, understanding wire color codes in your Impreza's wiring harness is essential for troubleshooting. Refer to the wiring diagram (a separate document from the fuse box diagram) for color codes. Common colors include red (power), black (ground), and various other colors for specific circuits.
Icons/Labels: These are the most important part of the diagram. They indicate the circuit or component protected by each fuse. Examples include:
- Headlight Symbol: Indicates the headlight circuit.
- Radio Symbol: Indicates the radio circuit.
- Fuel Pump Symbol: Indicates the fuel pump circuit.
- ABS Symbol: Indicates the ABS circuit.
- Numbers: Often, the diagram will use numbers (e.g., "Fuse #12") to refer to specific fuse locations.
Amperage Rating: Each fuse location will be labeled with the appropriate amperage rating (e.g., "15A"). Always replace a blown fuse with one of the same amperage rating. Using a higher amperage fuse can overload the circuit and cause serious damage or a fire.

How It Works

The fuse box is essentially a distribution panel for electrical power. Power from the battery flows to the fuse box, where it's then distributed to various circuits throughout the car. Each circuit is protected by a fuse of the appropriate amperage rating. If a fault occurs in a circuit, the excessive current will cause the fuse to blow, interrupting the flow of electricity and preventing damage. Relays, controlled by the ECU or other switches, allow low-current signals to switch higher-current circuits on or off, enabling control of things like headlights and fuel pumps.

Real-World Use: Basic Troubleshooting Tips

Let's say your 2015 Impreza's cigarette lighter (or 12V accessory socket) suddenly stops working.

Consult the Diagram: Locate the under-dash fuse box diagram (you can download it from the link provided at the end of this article!). Find the fuse labeled "CIG LTR" or "ACCESSORY SOCKET" (the exact label might vary slightly).
Identify the Fuse: Note the fuse number and amperage rating (e.g., "Fuse #22, 15A").
Locate the Fuse: Physically locate the fuse in the fuse box according to the diagram.
Inspect the Fuse: Use the fuse puller to remove the fuse. Hold it up to the light and inspect the filament. If the filament is broken or there's a dark spot inside the fuse, it's blown.
Replace the Fuse: Replace the blown fuse with a new fuse of the same amperage rating.
Test the Circuit: Turn on the ignition and test the cigarette lighter socket. If it now works, you've solved the problem!
If the Fuse Blows Again: If the new fuse blows immediately, there's a persistent short circuit in the circuit. Further diagnosis is required, and it's best to consult a qualified mechanic.

Safety Considerations

Working with automotive electrical systems can be dangerous. Here are some key safety precautions:

Disconnect the Battery: Before working on the fuse box or any electrical components, disconnect the negative (-) battery terminal. This will prevent accidental short circuits and electric shocks.
Use the Correct Fuse: Never replace a blown fuse with one of a higher amperage rating. This can overload the circuit and cause a fire. Always use a fuse of the same amperage rating as the original.
Beware of Airbag Circuits: Airbag circuits are clearly marked and require special handling. Do not tamper with airbag circuits unless you are a trained professional. Accidental deployment of an airbag can cause serious injury. Look for yellow connectors and clear warnings on the fuse box diagram.
Work in a Well-Lit Area: Good lighting is essential for seeing the small fuses and labels in the fuse box.
Consult a Professional: If you are unsure about any aspect of electrical troubleshooting, consult a qualified mechanic.

Remember, this article provides a general overview. For the most accurate information, always refer to the specific fuse box diagram for your 2015 Subaru Impreza. The diagram will show the exact location and function of each fuse and relay.

You can download a detailed fuse box diagram for the 2015 Subaru Impreza by clicking HERE. This diagram provides all the necessary information for troubleshooting and working with your Impreza's electrical system.