2021 Volvo VNR Fuse Box Diagram & Amperage

Quick Answer

The 2021 Volvo VNR typically has three main fuse box locations:

• Under-hood: Located on the passenger side, near the firewall.
• Dash Kick-Panel: Generally found on the passenger side, behind a removable panel.
• Sleeper/Cabin Rear Wall: Often located behind a panel on the rear wall of the sleeper or cabin.

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Under-Hood Fuse Box

The under-hood fuse box contains fuses and relays for critical vehicle systems, including the engine control module (ECM), ignition, starter, ABS, and major lighting circuits. Always refer to the fuse legend inside the fuse box lid for the exact configuration for your specific VNR trim.

Fuse #	Amp	Color	Circuit / Component Protected
F1	20A	Yellow	ECM / PCM Power
F2	10A	Red	Ignition System
F3	30A	Green	Starter Relay
F4	25A	Clear	ABS System
F5	15A	Blue	Low Beam Headlight (Right)
F6	15A	Blue	Low Beam Headlight (Left)
F7	15A	Blue	High Beam Headlight (Right)
F8	15A	Blue	High Beam Headlight (Left)
F9	10A	Red	Fuel Pump Relay Control
F10	20A	Yellow	Trailer Brake Primary Power
F11	10A	Red	Tail Lights / Marker Lights
F12	10A	Red	Park Lights
F13	20A	Yellow	Auxiliary Power Outlet (Under-Hood)
F14	30A	Green	Trailer ABS Power
F15	10A	Red	HVAC Blower Relay Control
F16	15A	Blue	Horn

Relay Locations (Under-Hood):

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: ECM Power Relay
• R4: HVAC Blower Motor Relay
• R5: Trailer Brake Relay

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Dash Kick-Panel Fuse Box (Passenger Side)

This fuse box typically houses fuses for interior electrical components, infotainment, various cabin accessories, and some control modules. Consult your VNR's fuse legend for precise details as configurations can vary by trim and installed options.

Fuse #	Amp	Color	Circuit / Component Protected
F1	10A	Red	Radio / Infotainment System
F2	15A	Blue	HVAC Blower Motor
F3	5A	Tan	Instrument Cluster
F4	10A	Red	Interior Lights
F5	15A	Blue	Cigar Lighter / 12V Outlet (Dash)
F6	20A	Yellow	Wiper Motor
F7	10A	Red	Turn Signals / Hazard Lights
F8	10A	Red	Brake Lights
F9	15A	Blue	A/C Clutch
F10	5A	Tan	Airbag System (SRS)
F11	10A	Red	Diagnostic Port (OBD-II)
F12	15A	Blue	Power Windows
F13	10A	Red	Power Mirrors
F14	15A	Blue	Trailer Brake Controller (Cabin)
F15	10A	Red	USB Charging Ports
F16	7.5A	Brown	Auxiliary HVAC Controls

Relay Locations (Dash Kick-Panel):

• R1: Accessory Power Relay
• R2: Wiper Motor Relay
• R3: HVAC Blower Speed Relay

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Sleeper/Cabin Rear Wall Fuse Box

For VNR models equipped with a sleeper, there is often an additional fuse box located on the rear wall of the sleeper or cabin. This box typically manages power for sleeper amenities and unique cabin features. Check the panel cover for an accurate diagram.

Fuse #	Amp	Color	Circuit / Component Protected
S1	20A	Yellow	Sleeper Refrigerator / Cooler
S2	15A	Blue	Sleeper Interior Lights
S3	10A	Red	Sleeper 12V Outlet / USB Charging
S4	20A	Yellow	Auxiliary HVAC Unit (Sleeper)
S5	30A	Green	Power Inverter (if equipped)
S6	15A	Blue	Entertainment System (Sleeper TV/DVD)
S7	10A	Red	Bunk Heater
S8	15A	Blue	Microwave Power (if equipped)

Relay Locations (Sleeper/Rear Wall):

• R1: Sleeper Accessory Power Relay
• R2: Power Inverter Relay

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How to Test a Fuse

1. Locate the Fuse Box: Identify the correct fuse box for the circuit you suspect has an issue.
2. Refer to the Diagram: Find the corresponding fuse number and circuit description on the fuse box lid or in your owner's manual.
3. Inspect Visually: A blown fuse often has a visible break in the metal wire inside. You can usually see this through the clear plastic body of the fuse.
4. Use a Fuse Tester or Multimeter: For a more reliable test, use a fuse tester or set a multimeter to the continuity setting.
   • With a Tester: Touch the probes of the tester to the two test points on top of the fuse. If the light illuminates (or the meter shows continuity), the fuse is good.
   • With a Multimeter: Remove the fuse and touch a probe to each metal blade. A reading of near zero ohms (or a beep on continuity mode) indicates a good fuse. An open circuit (no reading) means the fuse is blown.
5. Replace if Blown: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and color. Never use a fuse with a higher amperage rating, as this can lead to electrical system damage or fire.

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Common Blown Fuses on This Vehicle

While any fuse can blow, some are more prone to failure due to the nature of the components they protect or common usage patterns. If you experience an electrical issue, start by checking these common culprits:

• Cigar Lighter / 12V Outlets: These fuses (often F5 in the Dash Kick-Panel box) frequently blow due to overloads from charging multiple devices or using high-power accessories. Check for frayed cords or faulty devices plugged into the outlets first.
• Headlights / Taillights: Fuses for lighting (such as F5-F8, F11, F12 in the Under-Hood box) can blow due to bulb failures, wiring issues, or even simply age. Inspect the bulbs for any signs of damage.
• HVAC Blower Motor: If your fan isn't working, check the blower motor fuse (F2 in the Dash Kick-Panel box) and its relay (R4 under the hood). Oftentimes, a struggling blower motor can draw too much current and eventually blow its fuse.
• Radio / Infotainment: If your radio suddenly goes dead, the fuse (F1 in the Dash Kick-Panel box) is a good place to start. Sometimes, aftermarket installations or wiring problems can cause this fuse to blow.
• Trailer Brake Controller: Heavy use or shorts in trailer wiring can cause the trailer brake fuses (F10, F14 in Under-Hood, F14 in Dash Kick-Panel) to blow. Always check your trailer's wiring for any issues.

Always remember to check the circuit itself for shorts or overloads after replacing a blown fuse to prevent immediate re-occurrence. If a fuse repeatedly blows, there's an underlying electrical problem that needs professional diagnosis.

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