2019 Nissan Altima Fuse Box Diagram & Amperage Guide

Quick Answer

The 2019 Nissan Altima has three main fuse box locations:

• Engine Compartment Fuse Box: Located under the hood, near the battery.
• IPDM E/R (Intelligent Power Distribution Module Engine Room): Integrated with the under-hood fuse box, this unit manages various electrical functions and contains several fuses and relays.
• Cabin Fuse Box (Junction Block): Located on the driver's side, behind the kick panel.

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Engine Compartment Fuse Box

This fuse box is located in the engine bay, to the right of the battery when facing the front of the car. It contains fuses for high-current circuits and major components. Always verify the exact fuse layout with the diagram on the fuse box lid, as configurations can vary slightly by trim level.

Fuse #	Amp	Color	Circuit / Component Protected
1	15A	Blue	Horn
2	10A	Red	ABS (Anti-lock Braking System)
3	15A	Blue	Headlight (Right)
4	15A	Blue	Headlight (Left)
5	10A	Red	Front Wiper
6	10A	Red	Washer Motor
7	20A	Yellow	Blower Motor (Front)
8	10A	Red	A/C Compressor Clutch
9	15A	Blue	Ignition Coils
10	15A	Blue	Fuel Pump
11	20A	Yellow	ECM (Engine Control Module)
12	10A	Red	Starter Signal
13	15A	Blue	O2 Sensor
14	10A	Red	Transmission Control Module (TCM)
15	10A	Red	Power Steering
16	30A	Green	ABS Valve Motor
17	30A	Green	ABS Motor
18	40A	Green	Blower Motor (Main)
19	50A	Red	Main Fuse (Ignition Switch)
20	40A	Green	Cooling Fan
21	20A	Yellow	Daytime Running Lights (DRL)
22	15A	Blue	Tail Lights
23	10A	Red	Park Lights

Relay Locations (Engine Compartment Fuse Box):

• Horn Relay: Controls the horn.
• Cooling Fan Relay: Activates the engine cooling fan.
• A/C Compressor Relay: Engages the A/C compressor clutch.
• Headlight Relays (Left/Right): Control power to the respective headlights.
• Fuel Pump Relay: Powers the fuel pump.
• Starter Relay: Energizes the starter motor.

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IPDM E/R (Intelligent Power Distribution Module Engine Room)

The IPDM E/R is integrated into the engine compartment fuse box on the 2019 Altima. It manages power distribution to various components and incorporates several fuses and relays digitally. While some specific functions are integrated, the following are common areas controlled by the IPDM E/R and may have their own integrated protection. Always refer to the physical diagram on the unit.

Fuse #	Amp	Color	Circuit / Component Protected
1	10A	Red	ECM Control
2	15A	Blue	Ignition System
3	10A	Red	ETCS (Electronic Throttle Control System)
4	10A	Red	VDC (Vehicle Dynamic Control)
5	10A	Red	Power Window (Driver)
6	10A	Red	Power Window (Passenger)
7	15A	Blue	Door Lock
8	20A	Yellow	Wipers (High)
9	15A	Blue	Wipers (Low)
10	10A	Red	Mirror Defogger

Relay Locations (Integrated within IPDM E/R - Not user-serviceable as individual components, but controlled):

• Wiper Relays: Control the high and low speeds of the wipers.
• Headlight Lo/Hi Relays: Manage the low beam and high beam headlights.
• Tail Lamp Relay: Controls the tail lights.
• Rear Defogger Relay: Activates the rear window defogger.

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Cabin Fuse Box (Junction Block)

This fuse box is located on the driver's side, behind the kick panel, usually requiring the removal of a small plastic cover. It protects interior electrical components and accessories.

Fuse #	Amp	Color	Circuit / Component Protected
1	10A	Red	Radio / Infotainment System
2	15A	Blue	Power Outlet (Cigar Lighter)
3	10A	Red	USB Charger
4	10A	Red	Airbag System
5	10A	Red	ABS/VDC
6	10A	Red	Turn Signals / Hazard Lights
7	10A	Red	Brake Lights
8	10A	Red	Power Door Locks
9	10A	Red	Power Windows (Rear)
10	10A	Red	Interior Lights
11	10A	Red	Meter / Instrument Cluster
12	10A	Red	HVAC Control Unit
13	7.5A	Brown	Supplemental Restraint System (SRS)
14	20A	Yellow	Power Outlet (Console)
15	10A	Red	Heated Seats
16	15A	Blue	Moonroof
17	10A	Red	Parking Assist Sensor
18	10A	Red	Blind Spot Warning

Relay Locations (Cabin Fuse Box):

• Accessory Relay: Controls power to accessories when the ignition is on.
• Blower Relay (Rear, if equipped): Powers the rear climate control blower.

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How to Test a Fuse

Testing a fuse is a straightforward process and requires a simple tool: a fuse tester or a multimeter.

1. Locate the fuse box: Refer to the "Quick Answer" section to find the relevant fuse box.
2. Identify the suspected fuse: Consult the fuse diagram (either on the fuse box lid or in your owner's manual) to pinpoint the fuse for the circuit that's not working.
3. Visual inspection: Many blade-type fuses have a small wire visible through the clear plastic. If this wire is broken or melted, the fuse is blown. However, sometimes a blown fuse isn't visually obvious.
4. Use a fuse tester: A fuse tester usually has a pointed probe and an alligator clip. Clip the alligator clip to a good ground point (any exposed metal on the car chassis). Touch the probe to the two small metal test points on the top of the fuse. If the tester 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.
5. Use a multimeter: Set your multimeter to the continuity setting (often indicated by a speaker icon). Touch one probe to each metal test point on the top of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If it shows "OL" (open loop) or no reading, the fuse is blown.
6. Replace the fuse: If a fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Never substitute a higher-rated fuse, as this can lead to serious electrical 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 common issues or heavy usage. On the 2019 Nissan Altima, look out for:

• Cigar Lighter / 12V Power Outlet Fuses: These often blow due to overloading with multiple devices, faulty chargers, or foreign objects inserted into the outlets. If your phone charger or other accessories aren't working, check the relevant 15A or 20A fuse in the cabin fuse box.
• Headlight Fuses: A blown headlight fuse (15A in the engine compartment) can be caused by a faulty bulb, a short in the wiring, or prolonged use. If one of your headlights goes out, this is a good place to start your diagnosis.
• Blower Motor Fuse: If your climate control fan stops working entirely, a blown 20A or 40A blower motor fuse in the engine compartment fuse box is a common culprit. This can sometimes be a symptom of a failing blower motor drawing too much current.
• Radio / Infotainment Fuses: Issues with the radio, touchscreen, or sound system can often be traced back to a 10A fuse in the cabin fuse box. These can blow from internal component failures or issues with connected accessories.
• Trailer Brake Controller Fuse (if aftermarket): While the Altima doesn't come with an integrated trailer brake circuit, if an aftermarket controller is installed, its dedicated fuse (usually 20A-30A, often inline with the power wire) can blow due to improper wiring or an issue with the trailer.

Always check the easiest-to-access fuses first for the affected circuit. If a fuse repeatedly blows, there's an underlying electrical issue that needs professional diagnosis.

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