2022 Mercedes-Benz Sprinter — Fuse Box Diagram & Amperage

The 2022 Mercedes-Benz Sprinter is a legendary workhorse, built to handle everything from heavy cargo deliveries to luxury RV conversions. With so many electronic systems and upfitter options available, diagnosing an electrical issue means knowing exactly where to find the fuses and relays. As an ASE-certified master technician, I’ve seen my fair share of electrical gremlins on the Sprinter platform. Below is a comprehensive guide to the fuse boxes on your 2022 Mercedes-Benz Sprinter.

Disclaimer: Fuse configurations can vary significantly based on trim levels, upfitter packages (like auxiliary batteries or trailer modules), and engine options (gas vs. diesel). Always verify your specific layout using the printed legend inside the fuse box lid or the factory owner's manual.

Quick Answer: Fuse Box Locations

On the 2022 Mercedes-Benz Sprinter (W907/W910 generation), the fuses and relays are split across three primary locations:

1. Driver’s Side Footwell/Lower Dash: Located behind a removable panel below the steering column, near the hood release.
2. Under the Driver's Seat: This is the main power distribution box and relay center. You access it by removing the side trim panel on the base of the driver's seat.
3. Passenger Footwell (Pre-Fuse Box): Under the floorboard on the passenger side, housing high-amp mega fuses for the starter, alternator, and main power feeds.

Driver’s Side Lower Dash Fuse Box

This fuse panel primarily handles interior accessories, lighting, and the MBUX infotainment system.

Under Driver’s Seat Fuse & Relay Box

This location is the nerve center of the Sprinter's drivetrain, heavy electrical loads, and upfitter connections. You will also find critical relays here (Starter Relay, Fuel Pump Relay, Engine Control Relay).

Note: Relays R1 (Starter), R2 (Engine Control), and R3 (Fuel Pump) are located at the top edge of this block.

Passenger Footwell Pre-Fuse Box

Hidden beneath the floor covering on the passenger side, this block contains non-serviceable (or bolt-in style) mega-fuses. If one of these blows, you have a major dead-short.

How to Test a Fuse

Before throwing parts at a dead radio or a blower motor that won't blow, you need to check the fuses.

1. Visual Inspection: Pull the suspected fuse using fuse pullers or needle-nose pliers. Hold it up to the light. If the metal "U" or "S" shaped wire inside is broken or blackened, the fuse is blown.
2. Use a Test Light: Ground the clamp of a 12V test light to a bare metal chassis point. Turn the ignition on. Touch the probe to the tiny exposed metal test points on the top of the fuse. If the light illuminates on one side but not the other, the fuse is blown.
3. Use a Multimeter: Set your multimeter to continuity (the beep setting). Touch a probe to each test point on top of the fuse. If you hear a beep, the fuse is good. If there is no beep, it needs replacement.

Always replace a blown fuse with one of the exact same amperage and color. Never install a higher-amp fuse to prevent it from blowing, as this can melt wiring harnesses or cause a vehicle fire.

Common Blown Fuses on the 2022 Sprinter

Based on typical repair orders, here are the most common electrical faults tied to fuses on the Sprinter:

• 12V Power Outlets / Cigar Lighter (Fuse #1, Dash): Sprinter drivers use a lot of chargers, dash cams, and GPS units. A cheap or faulty phone charger will frequently pop this 15A fuse.
• Trailer Lights & Trailer Brake Controller (Under Seat Fuses): Because Sprinters are often used for towing, shorts in the trailer wiring harness or a corroded 7-way plug will quickly pop the trailer module fuses. Always check the trailer's wiring before replacing the fuse.
• Blower Motor (Fuse #11, Dash): If you operate your Sprinter in dusty environments, the cabin air filter can clog, forcing the blower motor to work harder. This excessive draw can eventually pop the 30A blower fuse.
• AdBlue/DEF Heaters (Diesel Models): Issues with the complex emissions systems can sometimes cause sensor or heater fuses under the driver's seat to blow. If you get a sudden check engine light and countdown timer, inspect the F39 circuit area.

If you are dealing with a persistent short circuit or your Sprinter requires electrical diagnostics beyond a simple fuse swap, don't risk damaging the complex CAN-bus system. Find a trusted shop on Repairius.