2018 Nissan Altima: Fuse Box Diagram & Amperage
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Quick answer
The 2018 Nissan Altima has three primary fuse box locations:
- Under the Hood: Located in the engine compartment, near the battery.
- Driver's Side Dash: Found behind a trim panel on the driver's side of the dashboard, near the steering wheel.
- Passenger's Side Dash: Located behind the glove box.
Under-Hood Fuse Box
This fuse box is found in the engine bay, typically near the battery on the driver's side. It houses higher amperage fuses and relays for major vehicle systems.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 31 | 10A | Red | A/C Compressor Clutch |
| 32 | 10A | Red | Horn |
| 34 | 15A | Blue | Fuel Injectors |
| 35 | 10A | Red | Ignition Coils |
| 36 | 15A | Blue | Oxygen Sensors |
| 37 | 10A | Red | Mass Airflow Sensor |
| 41 | 15A | Blue | Low Beam Headlight (Right) |
| 42 | 15A | Blue | Low Beam Headlight (Left) |
| 43 | 10A | Red | High Beam Headlight (Right) |
| 44 | 10A | Red | High Beam Headlight (Left) |
| 45 | 10A | Red | Parking Lights, Tail Lights |
| 46 | 10A | Red | Brake Lights |
| 51 | 30A | Green | ABS Control Module |
| 52 | 30A | Green | Starter Motor |
| 53 | 20A | Yellow | Fuel Pump |
| 56 | 40A | Green | Blower Motor |
| 58 | 50A | Red | Main Ignition Switch |
| Relay | Circuit | ||
| R1 | Black | A/C Compressor Clutch Relay | |
| R2 | Black | Horn Relay | |
| R3 | Black | Fuel Pump Relay | |
| R4 | Black | Ignition Main Relay | |
| R5 | Black | Starter Relay | |
| R6 | Black | Blower Motor Relay |
Driver's Side Dash Fuse Box
This fuse box is located behind a pull-off panel on the lower part of the driver's side dashboard, to the left of the steering column. It mainly protects interior circuits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 10A | Red | Airbag Module |
| 2 | 15A | Blue | Power Outlet (Cigar Lighter) |
| 6 | 15A | Blue | Audio System/Infotainment |
| 10 | 10A | Red | Instrument Cluster |
| 12 | 15A | Blue | Power Windows |
| 13 | 10A | Red | Interior Dome Lights |
| 15 | 10A | Red | ECM/PCM |
| 18 | 10A | Red | Turn Signals |
| 20 | 15A | Blue | Windshield Wipers |
How to test a fuse
You can visually inspect a fuse to see if it has blown. Remove the suspect fuse from the fuse box using a fuse puller (often found in the fuse box lid) or a pair of needle-nose pliers.
- Visually Inspect: Hold the fuse up to the light. Inside the plastic body is a thin metal strip. If this strip is broken or melted, the fuse is blown and needs to be replaced.
- Use a Multimeter: For a more definitive test, set a multimeter to the continuity setting. Touch the probes to each of the two metal prongs on the top of the fuse. If the multimeter beeps or shows a reading of zero ohms, the fuse is good. If it remains silent or reads "OL" (open loop), the fuse is blown.
Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-rated fuse can cause severe damage to the electrical system.
Common blown fuses on this vehicle
- Power Outlet (Cigar Lighter) Fuse: This is one of the most common fuses to blow. It is often caused by a faulty phone charger or another device plugged into the outlet. Before replacing the fuse, unplug any devices and inspect the outlet for foreign objects like coins.
- Audio/Radio Fuse: If your radio suddenly stops working, this fuse is the first thing to check. It can sometimes blow without a clear cause, but it’s worth checking if any aftermarket audio equipment has been installed.
- Headlight Fuses: If one of your headlights goes out, it's possible the bulb has burned out. However, if a new bulb doesn't fix the problem, check the corresponding low or high beam fuse. If the fuse is blown, it could indicate a wiring issue that should be investigated.
Note: This guide provides a common fuse layout. Fuse locations and amperage can vary based on your vehicle's specific trim level and options. Always consult the diagram printed on the inside of the fuse box cover to verify the correct fuse for the circuit in question.
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Before you pull a fuse on the 2018 Nissan Altima
- 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 2018 Nissan Altima
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
2018 Nissan Altima 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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