2015 Mercedes-Benz Sprinter Fuse Box Diagram & Amperage Guide
An ASE Master Tech's guide to W906 Sprinter fuse locations, relays, and circuit diagrams.
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Here is the definitive guide to the 2015 Mercedes-Benz Sprinter fuse box locations, amperage ratings, and circuit diagrams. As an ASE-certified master technician, I’ve spent countless hours diagnosing electrical gremlins on these NCV3-generation Sprinters. Whether you're tracking down a dead 12V power outlet, a non-functional blower motor, or an ECM issue, finding the right fuse is the first step.
Always remember that fuse configurations can vary based on trim levels, upfitter packages, and diesel vs. gas engine options. Always verify with the printed legend on your fuse box lid or in your owner’s manual.
Quick answer: Where are the fuse boxes on a 2015 Mercedes Sprinter?
The 2015 Mercedes-Benz Sprinter has two primary fuse and relay panels you need to know about:
- Main Fuse Box (Under the Dashboard): Located in the driver's side footwell, behind a trim panel just below the steering column and headlight switch.
- Driver's Seat Base Fuse Box: Located underneath the driver's seat. You access it by removing the side trim panel on the seat base. This box houses high-amperage maxi-fuses, essential relays, and upfitter-specific circuits.
Main Fuse Box (Under Dashboard / Steering Column)
This fuse panel primarily protects interior electronics, lighting, and basic vehicle controls.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 15A | Light Blue | Radio / Infotainment System, Navigation |
| 2 | 15A | Light Blue | Diagnostic Connector (OBD-II), Steering Column Module |
| 3 | 20A | Yellow | Instrument Cluster, Anti-Theft Alarm |
| 4 | 15A | Light Blue | Central Locking System |
| 5 | 10A | Red | Airbag Control Unit (SRS) |
| 6 | 15A | Light Blue | Front Passenger Compartment Lighting |
| 7 | 10A | Red | Horn, Steering Angle Sensor |
| 8 | 15A | Light Blue | Headlight Low Beam (Left) |
| 9 | 15A | Light Blue | Headlight Low Beam (Right) |
| 10 | 15A | Light Blue | Headlight High Beam (Left) |
| 11 | 15A | Light Blue | Headlight High Beam (Right) |
| 12 | 10A | Red | Tail / Park Lights (Left) |
| 13 | 10A | Red | Tail / Park Lights (Right) |
| 14 | 15A | Light Blue | Brake Lights, Stop Lamp Switch |
| 15 | 25A | Clear/White | Windshield Wipers |
| 16 | 15A | Light Blue | Ignition Switch (EIS) |
| 17 | 15A | Light Blue | Cigar Lighter / Front 12V Power Outlet |
| 18 | 10A | Red | Electronic Stability Program (ESP) / ABS module |
| 19 | 7.5A | Brown | Air Conditioning (A/C) Compressor Clutch |
| 20 | 10A | Red | Engine Control Module (ECM / PCM) Wake-up |
Relays in this area typically include the turn signal relay and terminal 15 (ignition) relay.
Driver's Seat Base Fuse Box
This location is heavy-duty. It handles the powertrain systems, climate control fans, and auxiliary upfitter connections (common on RVs or work vans).
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 30A | Green | Blower Motor (Front Cabin) |
| F2 | 20A | Yellow | Fuel Pump Module |
| F3 | 25A | Clear/White | Starter Motor Relay Circuit |
| F4 | 30A | Green | ABS / ESP Pump Motor |
| F5 | 30A | Green | ABS / ESP Valves |
| F6 | 15A | Light Blue | Engine Control Module (ECM / PCM) Main Power |
| F7 | 20A | Yellow | Glow Plug Module (Diesel Models) |
| F8 | 30A | Green | Trailer Brake Controller / Trailer Towing Module |
| F9 | 15A | Light Blue | Rear Cargo 12V Power Outlet |
| F10 | 40A | Orange (Maxi) | Auxiliary Heating / Rear A/C Blower |
| F11 | 15A | Light Blue | Auxiliary Battery Charging Relay |
| F12 | 25A | Clear/White | Power Windows (Left/Right) |
| F13 | 30A | Green | Power Seats (If equipped) |
| F14 | 50A | Red (Maxi) | Glow Plug Output Stage (Pre-heating) |
| F15 | 30A | Green | Auxiliary Equipment (Upfitter Switch Block) |
Relay Locations under the seat: You will also find the Fuel Pump Relay, Starter Relay, Terminal 87 (Engine Main) Relay, and Blower Motor Relay mounted alongside these fuses.
How to test a fuse
When tracking down an electrical problem, never assume a fuse is good just by looking at it. Micro-fractures in the fuse element can trick your eyes.
The Test Light Method:
- Turn the ignition key to the ON position (engine off).
- Attach the ground clip of your automotive 12V test light to a solid, bare metal chassis ground.
- Lightly probe the two small exposed metal testing tabs on the top of the suspected fuse.
- If the test light illuminates on both sides, the fuse is good. If it lights up on one side but not the other, the fuse is blown and must be replaced. If it doesn't light up on either side, that circuit isn't receiving power (check relays or ignition state).
The Multimeter Method (Most Accurate):
- Pull the fuse out of the fuse box.
- Set your digital multimeter to the ohms (Ω) or continuity setting (the one that beeps).
- Touch the probes to the two blades of the fuse.
- A reading of less than 1 ohm (or a beep) means the fuse is intact. A reading of "OL" (Open Loop) means the fuse is blown.
Common blown fuses on this vehicle
Based on what rolls into the service bay, here are the most frequent offenders on the 2015 Mercedes Sprinter:
- Cigar Lighter / 12V Outlet (Under Dash Fuse #17): Delivery drivers and campers plug splitters, heavy-duty chargers, and inverters into the factory 12V socket. It’s only rated for 15 amps. If your dash charger dies, check this first.
- Blower Motor (Seat Base Fuse F1): The Sprinter blower motors draw a lot of current as they age, especially if the cabin air filter is severely clogged. If your AC/Heat stops blowing, check the 30A fuse under the seat. If it keeps blowing, the blower motor itself is likely failing.
- Trailer Lights / Module (Seat Base Fuse F8): Sprinters used for towing frequently blow the trailer module fuses due to short circuits in older rental trailers. Inspect the 7-pin trailer connector on the bumper for corrosion before slapping a new 30A fuse in.
- Fuel Pump (Seat Base Fuse F2): If your Sprinter cranks but won't start, check this 20A fuse. A clogged fuel filter forces the pump to work harder, increasing amperage draw and popping the fuse.
Always replace a blown fuse with one of the exact same amperage. Never install a larger fuse, as it can melt the wiring harness and cause a vehicle fire.
Need help diagnosing an electrical short or a module failure? Don't leave it to chance. Find a trusted shop on Repairius.
Before you pull a fuse on the 2015 Mercedes-Benz Sprinter
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2015 Mercedes-Benz Sprinter
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2015 Mercedes-Benz Sprinter Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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