2023 Nissan Altima Fuse Box Diagram

Quick Answer

Your 2023 Nissan Altima has three primary fuse box locations:

1. Under-Hood Fuse & Relay Box: Located in the engine bay, typically near the battery on the driver's side. It contains higher-amperage fuses and relays for critical engine and lighting components.
2. Driver's Side Interior Fuse Box: Found inside the cabin, behind a small panel on the dashboard to the left of the steering column. It protects most of the interior circuits and accessories.
3. Passenger's Side Interior Fuse Box: Located behind the glove box or a kick panel in the passenger footwell, this secondary box handles additional cabin and body control circuits.

Always confirm fuse locations and ratings with the diagram printed on your vehicle's fuse box cover(s), as configurations can vary slightly based on trim level and installed options.

Under-Hood Fuse & Relay Box

The main fuse box in the engine compartment houses fuses and relays for high-power systems like the engine control module (ECM), fuel pump, starter, and ABS. To access it, locate the black plastic box near the battery, and press the release tabs to remove the cover.

Relay Locations (Under-Hood)

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: A/C Clutch Relay
• R4: Horn Relay
• R5: ECM/PCM Main Relay
• R6: Blower Motor Relay

Driver's Side Interior Fuse Box (Dashboard)

This fuse panel, often called the Junction Block (J/B), handles the majority of your Altima's interior electronics. It is located behind a pull-off trim panel on the driver's side dashboard, to the left of the steering wheel. You may need to open the driver's door to see it clearly.

Passenger's Side Interior Fuse Box

This secondary interior fuse panel is typically located behind the glove compartment. To access it, you may need to unlatch the glove box and let it swing down completely out of the way. This box contains fuses for body control module (BCM) functions and other accessories.

How to Test a Fuse

Visually inspecting a fuse is the simplest method. A blown fuse often has a broken or melted metal strip inside.

1. Turn the vehicle off.
2. Remove the fuse. Use the fuse puller tool, which is often clipped inside the under-hood fuse box lid. If you don't have one, needle-nose pliers can work carefully.
3. Inspect the metal link. Hold the fuse up to a light source. If the thin metal wire or strip inside the plastic housing is broken, the fuse is blown and needs replacement.
4. Confirm with a multimeter (optional). For a more definitive test, set a multimeter to the continuity setting (it often looks like a sound wave symbol). Touch the probes to each of the two metal prongs on top of the fuse. If the multimeter beeps or reads close to zero ohms, the fuse is good. If it remains silent or shows "OL" (open loop), the fuse is blown.

Important: 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 circuit and create a fire hazard.

Common Blown Fuses on the 2023 Nissan Altima

While the Altima is a reliable vehicle, certain fuses are more prone to blowing due to the nature of the circuits they protect.

• Fuse: #14 (15A) - Power Outlet / Cigar Lighter: This is one of the most common fuses to blow. It is almost always caused by a faulty phone charger, a loose coin falling into the outlet, or a connected device that draws too much power. What to check first: Unplug any devices from the 12V outlets and inspect inside the socket for foreign objects before replacing the fuse.
• Fuse: #13 (15A) - Audio / Infotainment System: If your radio or center display suddenly goes black, this fuse is a likely culprit. It can sometimes blow without a clear cause, but it may also indicate an issue with an aftermarket sound system installation or a problem with the infotainment unit itself. What to check first: Try a simple reset by replacing the fuse. If it blows again immediately, the head unit may have an internal short, requiring professional diagnosis.
• Fuse: #14 (40A) - Blower Motor: If your climate control fans stop working on all speeds, check this high-amperage fuse in the under-hood box. This can happen if the blower motor is aging and drawing too much current, or if debris gets into the blower fan cage, causing it to seize. What to check first: Listen for any grinding or squealing noises from the passenger side dashboard area when you attempt to turn the fan on. If the fuse blows repeatedly, the blower motor likely needs to be inspected or replaced.

If a fuse blows immediately after you replace it, this indicates a persistent short circuit in that component or its wiring. Do not continue to replace the fuse, as this can cause further damage. The circuit needs to be professionally diagnosed.

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