Fuse box <em>Nissan Sunny FB15</em> in the cabin: decoding, diagram and repair secrets

Nissan Sunny FB15 is one of the most popular sedans in the Japanese brand’s lineup, but even such a reliable car can have electrical problems. Most often, fuses are to blame: they blow out for no apparent reason, causing malfunctions in the headlights, radio or power windows. If you encounter electrical problems, first check fuse box in the cabin — it hides the answers to 80% of typical faults.

In this article you will find detailed description of each fuse indicating the current strength, critical circuits and signs of malfunction. We will also show where exactly is the block located? (with photo), how to properly remove and check fuses, and reveal 3 little-known nuances, which save time during diagnosis. The information is relevant for Nissan Sunny FB15 2011–2017 model years, including restyled versions.

Where is the fuse box in the passenger compartment? Nissan Sunny FB15?

Unlike many modern cars, where fuses are scattered across several blocks, in Sunny FB15 the main cabin unit is concentrated in one place. It is located under the dashboard on the driver's side, but getting to it is not so easy - you need to know the exact sequence of actions.

Here are the step-by-step instructions:

• 🔧 Open the driver's door and move the seat back as far as possible — this will give access to the lower part of the dashboard.
• 🔍 Under the steering column, find plastic cover rectangular in shape (color - gray or black, depending on the configuration). It is secured with two latches.
• 🖐️ Careful pry off the cover with a flathead screwdriver (it’s better to wrap it in cloth so as not to scratch the plastic) and remove. Below it you will see the fuse and relay box.

⚠️ Attention: Do not confuse this block with relay block under the hood (he is responsible for the starter, generator and powerful consumers). Fuses are concentrated in the cabin only for indoor equipment - lighting, multimedia, climate control, etc.

Fuse diagram and decoding: what is responsible for what?

Fuse box Nissan Sunny FB15 contains 30–35 elements (depending on the configuration). Each fuse is marked with a letter F and number (for example, F1, F15). Below is a complete table with a breakdown, current strength and typical symptoms of a malfunction.

Number	Current (A)	Purpose	Symptoms of a problem
F1	10	Audio system, navigation	The radio does not work, the screen goes blank, there is no sound
F7	15	Cigarette lighter, 12V socket	Phone charging does not work, cigarette lighter does not heat up
F12	20	Window lifters (driver's side)	Driver's window does not go up/down
F18	10	Dashboard lighting	The speedometer and tachometer lamps are dim or not working
F25	15	Central locking, alarm	Doors cannot be closed/opened using the key fob, the alarm does not work

🔹 Important nuance: In versions with climate control fuse added F30 (10A), responsible for the heater control panel. If your airflow or temperature control buttons stop working, check this one.

Why do fuses blow more often in winter?

Cold starting the engine increases the load on the battery, which leads to voltage surges in the on-board network. Circuits with high consumption (window lifters, heated seats) are especially vulnerable. If the fuse blows repeatedly, look for short circuit in the wiring or a faulty consumer (for example, a jammed window lift motor).

How to properly check and replace fuses?

Before replacing the fuse be sure to turn off the ignition (better remove the key from the lock). Next, follow the algorithm:

1. 🔍 Visual inspection: Remove the fuse with tweezers (it is in the block) and look at the light. If the wire inside is burned out, the element must be replaced.
2. 📊 Checking with a multimeter: Switch the tester to continuity mode and touch the fuse contacts with the probes. A beep means the circuit is working properly.
3. 🔧 Replacement: Install the fuse same denomination (current strength!). The use of "bugs" or elements with a large amperage is fraught with fire in the wiring.

⚠️ Attention: If the new fuse blows immediately - don't put the next one! This is a sign of a short circuit. It is necessary to diagnose the chain (for example, the window regulator may jam due to ice or dirt in the mechanism).

Typical problems and their solutions

Owners Nissan Sunny FB15 often encounter the same faults related to fuses. Here are the top 5 symptoms and their causes:

• 🔋 Cigarette lighter does not work: Culprit - F7 (15A). It often burns out due to the use of powerful chargers (for example, for laptops). Solution: Replace the fuse and use a power strip with overload protection.
• 🔊 The radio is silent: Check F1 (10A) And F16 (10A) (in versions with amplifier). If the fuses are intact, reset the audio system settings via RESET button (located on the radio panel).
• 🚪 Window lifters do not work: For F12 (20A) The driver's window is responsible for F13 (20A) - the rest. If the fuses are good, check power window relay (it is located in the same block, marked R4).
• 💡 Panel lights do not light up: This F18 (10A). If the replacement does not help, the problem is in brightness control (potentiometer on the back of the dashboard).
• 🔑 Central locking does not work: fuse F25 (15A) + relay R7. Often to blame alarm control unit (located behind the glove compartment).

3 secrets that the service won’t tell you

Few people know, but the Nissan Sunny FB15 has hidden nuances in working with fusesthat save time and money:

1. fuse F20 (10A) is responsible for heating the seats and mirrors. If one of the mirrors does not heat, check connector under the door trim (often oxidizes). Don't rush to change the fuse!
2. The block has "backup" fuses. The manufacturer leaves 2–3 free slots (for example, F28 And F29) - you can temporarily throw a chain there if the main element burns out (but do not abuse it!).
3. Problems with rain sensor (in versions with automatic glass cleaning system) are associated with F19 (10A). If the windshield wipers operate erratically, clean the sensor (it is located near the windshield near the mirror) and check the fuse.

⚠️ Attention: In cars with xenon headlights fuse F10 (15A) protects ignition unit. If the lamp blinks or does not light up, do not rush to change the headlight itself. Check the fuse and relay first R3.

Common mistakes when working with fuses

Even experienced car owners make mistakes that lead to even more serious damage. That's what can't do under no circumstances:

• ⚡ Use "bugs" made of foil or wire. This may result in melted wiring or fire. If there is no suitable fuse, temporarily disconnect the faulty consumer.
• 🔧 Change fuses with the ignition on. A power surge can damage electronic components (e.g. ECU or BCM).
• 🔍 Ignore melted contacts in the block. If the fuse socket is blackened, it needs to be cleaned or the entire unit replaced (otherwise the new fuse will quickly burn out).
• 📋 Keep no records of replacements. If the same fuse blows regularly, keep a diary (date, conditions, what was turned on). This will help identify a pattern (for example, the problem only appears when it rains).

💡

If the fuse blows immediately after replacement, the problem is not in it, but in the circuit. Further replacement without diagnostics will lead to damage to the wiring or electronic components.

FAQ: Answers to popular questions

Is it possible to use fuses with a higher rating (for example, instead of 10A, use 15A)?

No! It's dangerous. A fuse is designed to protect a specific circuit. If you install an element with a higher current strength, it will not burn out in the event of a short circuit, but the wiring may melt or the device (for example, an audio system) may fail. Always use fuses strictly at face value.

Where to buy fuses for Nissan Sunny FB15?

Suitable fuses (standard ATO/ATC) are sold:

• In car dealerships (for example, Autodoc, Exist)
• In markets (cost 10–50 rubles per piece)
• In online hypermarkets (Wildberries, Ozon - look for sets of 100 pcs.)

For Sunny FB15 brand fuses are suitable Hella, Bosch or Valeo.

How can you tell if a relay has burned out and not a fuse?

Relays and fuses often work in pairs. If the problem remains after replacing the fuse:

1. Listen to the unit when you turn on the ignition - a working relay makes a slight click.
2. Swap the suspect relay for one that is known to work (for example, a cooling fan relay).
3. Test the relay contacts with a multimeter (winding resistance should be 50–120 Ohms).

What to do if there are no spare fuses in the block?

B Nissan Sunny FB15 Spare fuses are usually located:

• B glove compartment (in a plastic bag with documentation).
• Under fuse box cover (sometimes glued on the inside).
• B trunk (complete with jack).

If they are not there, buy a set in advance. We recommend that you always carry fuses with a rating of 10A, 15A And 20A.

Can a fuse blow due to “lighting” another car?

Yes, but only if:

• You have connected cigarette lighter "crocodiles" to oxidized terminals (voltage surge).
• The donor battery was very discharged (voltage below 10V).
• You didn't comply polarity when connected.

Fuses are the most common problem F7 (cigarette lighter) And F10 (lighting). Always check them after lighting!