2017 Subaru Forester Fuse Box Diagram

For the intermediate DIY mechanic tackling electrical issues on a 2017 Subaru Forester, understanding the fuse box diagram is absolutely critical. Whether you’re diagnosing a faulty turn signal, installing aftermarket accessories, or simply learning more about your vehicle's electrical system, this diagram is your roadmap. It's far more efficient than guessing or relying on generic repair guides.

Purpose and Importance

The fuse box diagram serves several key purposes:

Troubleshooting Electrical Problems: Quickly identify the fuse responsible for a specific circuit, allowing you to check for blown fuses as the first step in diagnosing electrical failures.
Installing Aftermarket Accessories: Find appropriate power sources for new devices, like auxiliary lights, dash cams, or aftermarket stereos. The diagram shows which circuits are readily available and which are protected by specific fuse ratings.
Understanding Circuit Protection: Learn how the electrical system is designed and protected by fuses. This knowledge helps in preventing overloads and potential damage to sensitive electronic components.
Preventing Further Damage: Replacing a fuse with the correct amperage rating is crucial. Using a higher amperage fuse than specified can bypass the intended protection and lead to component damage or even a fire.
General Maintenance and Learning: Simply understanding the layout and function of the fuse box provides valuable insight into your vehicle's electrical system.

Key Specs and Main Parts of the 2017 Subaru Forester Fuse Boxes

The 2017 Subaru Forester typically has two main fuse box locations:

Interior Fuse Box: Located under the dashboard, usually on the driver's side. This fuse box primarily protects circuits related to interior components, such as the radio, lights, power windows, and various control modules.
Engine Compartment Fuse Box: Found in the engine bay, often near the battery. This box safeguards circuits associated with engine management, headlights, cooling fans, and other critical systems.

Key specs of the fuse boxes include:

Fuse Types: The 2017 Forester primarily uses blade-type fuses, which come in various sizes like ATO (standard), Mini, and occasionally Micro. The amperage rating is clearly marked on each fuse.
Fuse Amperage Ratings: Ranges typically from 5 amps to 30 amps, depending on the circuit's requirements. Always refer to the diagram to ensure you use the correct amperage.
Relays: While not fuses, relays are also housed within the fuse boxes. They are electromechanical switches that control high-current circuits based on signals from low-current circuits (e.g., headlights, fuel pump). The diagram indicates the location and function of each relay.

Decoding the Fuse Box Diagram: Symbols, Lines, and Colors

A fuse box diagram uses standard symbols and conventions to represent the various components and circuits. Understanding these symbols is key to interpreting the diagram correctly.

Common Symbols:

Fuse Symbol: Typically represented as a wavy line inside a rectangle. Some diagrams may use a simple straight line. The amperage rating is usually indicated next to the symbol.
Relay Symbol: Shown as a coil of wire connected to a switch. The diagram often indicates the type of relay (e.g., SPDT, SPST).
Ground Symbol: A series of horizontal lines descending in size, indicating a connection to the vehicle's chassis ground.
Connector Symbol: Represented by a circle or a square with lines pointing outwards, indicating a wiring harness connector.

Understanding Lines and Colors:

Solid Lines: Indicate a direct electrical connection.
Dashed Lines: May indicate a connection through a switch or another intermediate component.
Wire Colors: Wiring diagrams (which are often linked to the fuse box diagram) will use standardized color codes to identify individual wires (e.g., Red, Blue, Black). While the fuse box diagram itself might not show wire colors directly, it's crucial for tracing circuits in conjunction with the wiring diagram.

Example: A symbol showing a wavy line inside a rectangle with "10A" next to it indicates a 10-amp fuse protecting the circuit. Following the line connected to that fuse symbol on a more detailed wiring diagram will lead you to the components powered by that circuit.

How It Works: Circuit Protection Explained

Fuses are sacrificial devices designed to protect electrical circuits from overcurrent. When the current flowing through a circuit exceeds the fuse's amperage rating, the fuse element (a thin wire inside the fuse) melts, breaking the circuit and preventing damage to downstream components. This is why a blown fuse indicates a problem in the circuit it protects.

Overcurrent can occur due to:

Short Circuit: An unintended low-resistance path to ground, causing a sudden surge of current.
Overload: Too many devices drawing power from the same circuit, exceeding its capacity.
Component Failure: A faulty component drawing excessive current.

The fuse box diagram is essential because it maps each fuse to the specific circuit it protects. Without it, you'd be guessing which fuse controls which function, potentially leading to incorrect diagnoses and further problems.

Real-World Use: Basic Troubleshooting Tips

Here's a basic troubleshooting process using the fuse box diagram:

Identify the Problem: Determine which electrical component is not working (e.g., the radio, the windshield wipers).
Consult the Diagram: Locate the fuse box diagram for your 2017 Subaru Forester (we have it available for download). Find the fuse that corresponds to the malfunctioning component.
Inspect the Fuse: Remove the fuse and visually inspect it. A blown fuse will have a broken filament inside. You can also use a multimeter to test for continuity across the fuse terminals. A good fuse will show continuity (close to 0 ohms), while a blown fuse will show no continuity (infinite resistance).
Replace the Fuse: If the fuse is blown, replace it with a new fuse of the exact same amperage rating. Never use a fuse with a higher amperage rating.
Test the Circuit: After replacing the fuse, test the component to see if it now works. If the fuse blows again immediately, there's a more serious problem in the circuit, such as a short circuit, requiring further investigation.

If a fuse keeps blowing:

Check for Short Circuits: Inspect the wiring for damage or exposed wires that might be shorting to ground.
Disconnect Components: Try disconnecting components one by one to isolate the problem. If the fuse stops blowing when a particular component is disconnected, that component is likely the culprit.
Consult a Professional: If you're unable to identify the problem, it's best to consult a qualified mechanic. Electrical problems can be complex and require specialized tools and knowledge.

Safety First: Identifying and Avoiding Risks

Working with automotive electrical systems can be dangerous. Always disconnect the negative battery terminal before working on the electrical system to prevent accidental short circuits and potential electric shock.

Pay special attention to high-current circuits:

Main Fuses: These fuses protect the entire electrical system and can carry very high currents. Exercise extreme caution when working around them.
Relays for High-Load Components: Be aware that relays controlling components like the starter motor or cooling fans also handle significant current.

Never bypass a fuse with a piece of wire or other conductive material. This completely eliminates the circuit protection and can lead to a fire.

Wear appropriate safety gear, including eye protection and gloves.

By understanding the fuse box diagram and following safe practices, you can confidently diagnose and repair electrical issues on your 2017 Subaru Forester. Remember to always double-check the diagram for your specific model year and trim level, as there may be slight variations.

We have the complete 2017 Subaru Forester fuse box diagram available for download. It contains detailed information about fuse locations, amperage ratings, and circuit assignments. Download it now to get started!