2017 Ford Expedition Fuse Box Diagram

The 2017 Ford Expedition is a reliable SUV, but like any vehicle, electrical issues can arise. Understanding your vehicle's fuse box diagram is crucial for diagnosing and resolving these problems efficiently. This guide provides a comprehensive breakdown of the 2017 Ford Expedition fuse box layout, empowering you to perform basic troubleshooting and repairs.

Purpose of the Fuse Box Diagram

The fuse box diagram is essentially a roadmap of your Expedition's electrical system. It identifies the location of each fuse and relay, along with the circuit it protects. Why is this important?

Troubleshooting: When an electrical component fails (e.g., headlights, radio, power windows), the fuse box diagram helps you quickly identify and check the corresponding fuse. A blown fuse is often the culprit, and replacing it is a simple fix.
Modifications: If you're adding aftermarket accessories like a new stereo, lights, or a trailer brake controller, the diagram allows you to safely tap into the vehicle's electrical system. You can identify suitable circuits to avoid overloading existing ones.
Learning Your Vehicle: Even if you're not experiencing any problems, familiarizing yourself with the fuse box diagram provides a better understanding of your Expedition's electrical architecture.

Key Specs and Main Parts

The 2017 Ford Expedition typically has two main fuse boxes:

Battery Junction Box (BJB): Located in the engine compartment, usually near the battery. This box contains high-amperage fuses and relays that protect critical systems like the starter, alternator, and power distribution.
Passenger Compartment Fuse Panel (CJB): Located inside the cabin, often behind a panel on the dashboard or under the steering wheel. This box houses fuses for interior components like the radio, lights, power windows, and climate control.

Key Specs to Note:

Fuse Ampere Rating: Each fuse is rated for a specific amperage (e.g., 5A, 10A, 20A). Using a fuse with a higher amperage than specified can damage the circuit and potentially cause a fire.
Fuse Type: Fuses come in various types, including blade fuses (ATO, Mini, Low-Profile Mini), cartridge fuses, and fusible links. The 2017 Expedition primarily uses blade-type fuses.
Relay Function: Relays are electromechanical switches that control high-current circuits using a low-current signal. They're commonly used for headlights, fuel pumps, and other power-hungry components.

Understanding Fuse Box Symbols

Fuse box diagrams use symbols to represent different components and their functions. Here's a breakdown of common symbols:

Fuses: Typically represented by a rectangle with a wavy line inside. The amperage rating is usually printed next to the symbol.
Relays: Often depicted as a square or rectangle with internal symbols representing the coil and contacts.
Circuit Numbers: Each circuit is usually assigned a number or code to help you trace it through the wiring harness.
Lines: Solid lines represent wiring connections, while dashed lines may indicate grounding points or shielded wiring.
Colors: Wire colors are often indicated using abbreviations (e.g., RD for Red, BL for Blue, BK for Black).
Icons: Some diagrams use icons to represent the function of the circuit (e.g., a headlight icon for the headlight circuit, a radio icon for the radio circuit).

Example: A symbol showing a rectangle with a wavy line inside and the number "15" next to it indicates a 15-amp fuse.

How It Works: From Battery to Component

The electrical system of your Expedition starts with the battery, which provides the electrical energy. From the battery, power flows through the wiring harness to various components. Fuses are placed in the circuit to protect these components from overcurrent. When the current exceeds the fuse's rating, the fuse element melts, breaking the circuit and preventing damage.

Simplified Circuit Path:

Battery
Wiring Harness
Fuse (protects the circuit)
Relay (if needed, to switch a high-current circuit)
Electrical Component (e.g., headlight, motor)
Ground (completes the circuit)

The fuse box acts as a central distribution point, organizing and protecting all these circuits. Without fuses, a short circuit could cause a fire or severely damage electrical components.

Real-World Use: Basic Troubleshooting

Let's say your Expedition's radio suddenly stops working. Here's how to troubleshoot using the fuse box diagram:

Locate the Fuse Boxes: Find the Battery Junction Box (BJB) under the hood and the Passenger Compartment Fuse Panel (CJB) inside the cabin.
Consult the Diagram: Refer to the fuse box diagram for the 2017 Ford Expedition. You can usually find a printed copy in the owner's manual, or you can download a digital copy (see note at end of article about obtaining a diagram). Identify the fuse labeled for the radio (e.g., "Radio," "Audio System").
Inspect the Fuse: Use a fuse puller (a small plastic tool often found in the fuse box) or needle-nose pliers to remove the radio fuse. Visually inspect the fuse. If the metal element inside the fuse is broken or blackened, the fuse is blown.
Replace the Fuse: Replace the blown fuse with a new fuse of the same amperage rating.
Test the Radio: Turn on the ignition and test the radio. If it works, you've solved the problem. If the fuse blows again immediately, there's likely a short circuit in the radio wiring or the radio itself, requiring further investigation by a qualified technician.

Common Issues and Related Fuses:

Headlights not working: Check the headlight fuses and relays.
Power windows not working: Check the power window fuses and the master switch.
Cigarette lighter/power outlet not working: Check the accessory power fuse.

Safety Precautions

Working with your vehicle's electrical system can be dangerous. Always follow these safety precautions:

Disconnect the Battery: Before working on any electrical components, disconnect the negative (-) terminal of the battery to prevent accidental shorts.
Use the Correct Fuse: Never replace a fuse with a higher amperage rating. This can overload the circuit and cause a fire.
Avoid Water: Never work on the electrical system in wet conditions.
High-Voltage Components: Be extremely cautious around high-voltage components like the ignition coil and fuel injectors. These components can deliver a dangerous electrical shock. If you're not comfortable working on these components, consult a qualified technician.
Airbag System: The airbag system is very sensitive and should only be worked on by trained professionals. Incorrectly handling the airbag system can cause accidental deployment, resulting in serious injury.

Important Note on High-Risk Components: The starter circuit and alternator circuit typically use high-amperage fuses and fusible links. These components can carry a significant amount of current and should be handled with extreme care. If you suspect a problem with the starter or alternator, it's best to have it diagnosed by a qualified mechanic.

By following this guide and exercising caution, you can safely troubleshoot and resolve many common electrical issues in your 2017 Ford Expedition.

We have the 2017 Ford Expedition fuse box diagram file available for download. Please reach out to us with your request, and we'll be happy to provide you with a copy.