2023 Volvo VNL Fuse Box Diagram & Amperage
A comprehensive guide to finding and understanding the fuse boxes in your 2023 Volvo VNL, including diagrams and circuit protection.
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Quick Answer
- Main Fuse Box: Located in the battery box, typically on the driver's side under the cab.
- Central Electrical Unit (CEU) / Cab Fuse Box: Located inside the cab on the passenger side kick panel.
- Auxiliary Fuse Box: Located in the cab behind the driver's seat, often in the bunk area or a storage compartment.
The Volvo VNL series, known for its robust performance and driver comfort, relies on a sophisticated electrical system. Understanding the fuse box layout and individual fuse functions is crucial for troubleshooting electrical issues. This guide provides a comprehensive overview of the fuse box locations, diagrams, amperage ratings, and the circuits they protect for your 2023 Volvo VNL. Always refer to your vehicle's owner's manual and the fuse box lid for the most accurate and up-to-date information, as fuse configurations can vary slightly due to trim levels and optional equipment.
Main Fuse Box (Battery Box)
This fuse box is typically found in the battery box, usually on the driver's side of the chassis, beneath the cab. It houses high-amperage fuses and relays that protect major electrical systems directly connected to the battery.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 150 | Red | Main Power Supply (to CEU) |
| F2 | 100 | Yellow | Alternator / Charging System |
| F3 | 80 | White | Starter Relay |
| F4 | 60 | Blue | ABS (Anti-lock Braking System) Power |
| F5 | 40 | Green | Air Dryer Heater |
| F6 | 30 | Green | Trailer Brake Controller Power |
| F7 | 20 | Yellow | ECM/PCM Main Power |
| F8 | 10 | Red | Fuel Pump Relay Control (Low Pressure) |
| F9 | 15 | Blue | Fuel Pump (High Pressure) |
Relay Locations (Main Fuse Box):
- R1: Starter Relay
- R2: IGN Relay (Ignition Switch Power)
- R3: ABS Relay
- R4: Fuel Pump Relay
- R5: Trailer Brake Relay
Central Electrical Unit (CEU) / Cab Fuse Box
The CEU, or Cab Fuse Box, is located inside the cab, typically on the passenger side kick panel. This fuse box protects most of the vehicle's interior electrical components and various control modules.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10 | Red | Headlights Low Beam (Left) |
| F2 | 10 | Red | Headlights Low Beam (Right) |
| F3 | 15 | Blue | Headlights High Beam (Left) |
| F4 | 15 | Blue | Headlights High Beam (Right) |
| F5 | 5 | Tan | Tail Lights / Marker Lights |
| F6 | 5 | Tan | Parking Lights |
| F7 | 10 | Red | Brake Lights |
| F8 | 20 | Yellow | Blower Motor (HVAC Fan) |
| F9 | 10 | Red | A/C Clutch / HVAC Controls |
| F10 | 15 | Blue | Radio / Infotainment System |
| F11 | 15 | Blue | IPC (Instrument Panel Cluster) |
| F12 | 20 | Yellow | Cigar Lighter / 12V Outlet (Dash) |
| F13 | 25 | Clear | Wiper Motor |
| F14 | 10 | Red | Washer Pump |
| F15 | 7.5 | Brown | Driver's Door Module |
| F16 | 7.5 | Brown | Passenger Door Module |
| F17 | 5 | Tan | Airbag System (Supplemental Restraint) |
| F18 | 5 | Tan | ECM/PCM (Keep Alive Memory / Wake-up) |
| F19 | 10 | Red | Diagnostic Port (OBD-II) |
| F20 | 15 | Blue | Horn |
Relay Locations (CEU / Cab Fuse Box):
- R1: Headlight Low Beam Relay
- R2: Headlight High Beam Relay
- R3: Blower Motor Relay
- R4: Horn Relay
- R5: Accessory (ACC) Relay
Auxiliary Fuse Box (Cab/Bunk Area)
This auxiliary fuse box is often located in the cab behind the driver's seat, sometimes within the bunk area or in a storage compartment. It typically handles power for various auxiliary and comfort features in the sleeper cab.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20 | Yellow | 12V Outlet (Bunk/Sleeper) |
| F2 | 15 | Blue | Refrigerator Power (Optional) |
| F3 | 10 | Red | Interior Dome Lights (Sleeper) |
| F4 | 10 | Red | TV/Entertainment System (Sleeper) |
| F5 | 5 | Tan | Bunk HVAC Controls |
| F6 | 15 | Blue | Inverter (if equipped) |
| F7 | 20 | Yellow | Trailer ABS (if equipped with separate power) |
Relay Locations (Auxiliary Fuse Box):
- R1: Bunk Power Outlet Relay
- R2: Sleeper Lighting Relay
How to Test a Fuse
- Safety First: Always turn off the ignition and any affected circuits before attempting to test or replace a fuse.
- Locate the Fuse: Refer to the fuse box diagram on the fuse box lid or in your owner's manual to identify the suspected fuse.
- Visual Inspection: Most modern fuses have a visible wire element inside. If this wire is broken or melted, the fuse is blown and needs replacement.
- Use a Fuse Tester or Multimeter:
- Fuse Tester: A simple fuse tester lights up if the fuse is good. Touch the probes to the small metal test points on top of the fuse. If it lights up on both sides, the fuse is good. If it only lights up on one side or not at all, the fuse is blown.
- Multimeter: Set your multimeter to the continuity setting (often indicated by a speaker icon) or ohms setting. Remove the fuse from its socket. Touch the multimeter probes to each metal blade of the fuse. If you hear a beep on the continuity setting or read near zero ohms, the fuse is good. If there's no beep or an
Before you pull a fuse on the 2023 Volvo VNL
- 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.
- Many heavy trucks have more than one power distribution point (cab, under-hood or near the batteries), and some circuits use circuit breakers instead of fuses. Some systems have 24-volt starting circuits; confirm the voltage before testing.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work · Find mobile truck repair
More specs for the 2023 Volvo VNL
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
2023 Volvo VNL 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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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-24.