Nissan Sunny (known in some countries as Almera or Sentra) is one of the most popular sedans in the Japanese brand’s lineup, especially across generations B17 (2010–2017) and B18 (2017–present). The car's electrical circuits are protected by fuses, and if problems arise with the lighting, audio system or other components, the first step is to check their integrity. However, it can be difficult to find exact information about the location and purpose of each element - especially if we are talking about versions for different markets (for example, Sunny for the Middle East or Almera for Europe).
In this article we will look at all fuse blocks in Nissan Sunny, including their location, diagrams with decoding, as well as typical symptoms of burnout of certain elements. You'll learn how to diagnose the problem yourself, what tools you'll need to replace it, and why some fuses fail more often than others. We will pay special attention to differences between generations B17 And B18, as well as nuances for cars with different types of engines (1.5L HR15DE, 1.6L HR16DE).
Where is the fuse box located in Nissan Sunny?
B Nissan Sunny provided two main fuse boxes:
- 🔧 Main unit in the cabin — located under the dashboard on the driver's side. To access it, you need to open the cover (it is secured with latches).
- ⚡ Additional block under the hood - located next to the battery (in some versions - in a separate plastic box). Responsible for high current circuits (e.g. radiator fan, starter).
In a generation B17 (2010–2017) the cabin unit is often hidden behind a decorative panel to the left of the steering column. B B18 (2017+) it has been moved closer to the center console, making it easier to access. Important: Some versions for Asian markets (e.g. Sunny N18 for India) the scheme may differ - we will discuss this below.
- B17 (2010–2017)
- B18 (2017–present)
- Other (specify in comments)
- I don't know the generation
To accurately identify the block, pay attention to its cover - there is usually a diagram with fuse numbers on it. If there is no diagram (or it has been erased), use our transcripts in the following sections.
Diagram and decoding of the cabin unit fuses
Salon block in Nissan Sunny Contains fuses for most vehicle electrical circuits. Below is the current generation diagram B18 (2017+), but it is also suitable for B17 with minor changes.
| Number | Ampere | Purpose | Notes |
|---|---|---|---|
| 1 | 10A | Audio system, navigation | Often burns out when there is a short circuit in the speakers |
| 5 | 15A | Cigarette lighter | Can burn out from powerful devices (for example, a compressor) |
| 10 | 7.5A | Speed sensor, speedometer | When burned out, the speedometer needle does not move |
| 15 | 10A | Engine control unit (ECU) | Replace only with the ignition off! |
| 20 | 20A | Window lifters | If all the windows stop working, check this fuse. |
Full diagram for your version Sunny can be found in instruction manual (section "Fuses"). If there is no manual, pay attention to the back of the block cover - sometimes the decoding is duplicated there. Important: in some market versions GCC (Middle East) cigarette lighter fuse is rated 20A, and not 15A, as in European models.
How to check a fuse without a tester?
Visually inspect the metal thread inside the fuse - if it is broken, the element is faulty. You can also replace a suspicious fuse with a known working fuse of the same rating (for example, swap the fuses for the cigarette lighter and radio).
Fuses under the hood: what they protect and how to check
The block under the hood (aka power fuse block) is responsible for circuits with high current consumption. B Nissan Sunny B17/B18 it is usually located next to the battery and is covered with a black plastic cover. Inside you will find both fuses and relays.
- 🔋 30A — Main relay of the injection system. If there is a malfunction, the engine will not start.
- 💡 40A — Low/high beam (left headlight). If it burns out frequently, check the lamps for short circuits.
- 🌀 50A — Radiator fan. If the fuse is blown, the engine will overheat.
- 🔌 60A — Generator. If the battery fails, it will not charge.
To check these fuses you will need multimeter or at least a warning light. Never replace power fuses with elements with a higher rating - this may lead to a fire in the wiring! For example, if you put 50A instead of 40A, if there is a short circuit in the headlight circuit, the wires may melt.
⚠️ Attention: Before working with the unit under the hood, be sure to remove the negative terminal from the battery! Voltage may remain in the circuits even when the ignition is turned off.
Typical faults and their causes
Some fuses in Nissan Sunny fail more often than others. Here are the most common problems and their possible causes:
- Cigarette lighter fuse (15A/20A) — burns out due to the connection of powerful devices (for example, a car vacuum cleaner or compressor). Solution: Use a power strip with overload protection.
- Audio fuse (10A) - often suffers when installing a non-standard radio or speakers with incorrect impedance. Check wiring for short circuit.
- Power window fuse (20A) — may burn out if all glasses are used simultaneously or the mechanism jams. Lubricate the glass guides with silicone grease.
- Radiator Fan Fuse (50A) — fails when the engine overheats or the temperature sensor malfunctions. Check the coolant level.
If the fuse blows again after replacement, this indicates short circuit in the chain. In this case, it is necessary to diagnose the wiring - it is better to contact an auto electrician. For example, a common problem in Sunny B17 — chafing of wires in the corrugation between the door and the body, which leads to the closure of the power window circuit.
☑️ Diagnosis of re-blown fuse
How to replace a fuse: step-by-step instructions
Replacing the fuse in Nissan Sunny - a simple procedure, but requires care. Here's what you'll need:
- 🔧 Tweezers (usually included with the car).
- 🔍 Flashlight (for illuminating the block under the hood).
- 📋 Fuse diagram (you can take a photo of the block cover).
- 🔌 A set of spare fuses (ratings: 5A, 7.5A, 10A, 15A, 20A, 30A).
Replacement steps:
- Turn off the ignition and remove the negative terminal from the battery (for the unit under the hood).
- Find the faulty fuse using the diagram or visually (burnt-out thread).
- Use tweezers to remove the old fuse and install a new one. same denomination.
- Check the operation of the circuit (for example, turn on the headlights or cigarette lighter).
⚠️ Attention: If the fuse blows again after replacing, do not install a new one - this may cause damage to the wiring or even a fire. Circuit diagnostics required!
Keep spare fuses in the glove compartment - you may need them unexpectedly on the road. For convenience, sign the denominations on the package with a marker.
Differences between fuse blocks Sunny B17 And B18
Although Nissan Sunny B17 (2010–2017) and B18 (2017+) are similar in appearance, but there are differences in their electrical circuits. Here are the key differences between fuse blocks:
| Parameter | Sunny B17 (2010–2017) | Sunny B18 (2017–present) |
|---|---|---|
| Location of the cabin unit | To the left of the steering column, behind the decorative panel | Closer to the center console, under the lid with latches |
| ECU fuse | 10A (number 15) | 7.5A (number 12) |
| Rear view camera fuse | Absent (option not provided) | 10A (number 25) |
| Generator power fuse | 50A | 60A (in versions with HR16DE) |
B B18 additional fuses for systems also appeared ADAS (if provided), for example, for a radar sensor or 360° camera. B B17 There are no such circuits, so the block diagrams do not match.
If you are the owner Sunny N18 (India version), please note that in this version the fuse heated rear window has a face value 25A (instead of 20A in European models). This is due to the characteristics of the climate system.
Frequently asked questions about fuses in Nissan Sunny
Is it possible to replace the fuse with a higher rated element?
No! This can lead to overheating of the wiring and even a fire. Always use a fuse with the rating specified in the diagram. For example, if the cigarette lighter circuit is 15A, replacing it with 20A is dangerous - the wires may melt if there is a short circuit.
Why does the power window fuse blow?
Most often this happens due to:
- Mechanism jamming (for example, due to icing or debris).
- Simultaneous use of all glasses (chain overload).
- Short circuit in the wiring (especially in the door corrugation).
Check the glass guides and lubricate them with silicone grease. If the problem persists, diagnose the wiring.
Where to find the fuse diagram for your version Sunny?
The diagram can be found:
- On the back of the fuse box cover.
- In the instruction manual (section "Fuses" or "Electrical equipment").
- On specialized forums (for example, Nissan Club or Drive2).
If there is no diagram, take a photo of the block cover and contact the dealer indicating the vehicle's VIN number.
What to do if the fuse is intact, but the circuit does not work?
Possible reasons:
- The relay is faulty (check for a click when the circuit is turned on).
- Broken wire or oxidation of contacts.
- Failure of the device itself (for example, a lamp or motor).
Use a multimeter to check the voltage at the fuse terminals. If there is no voltage, the problem is in the wiring or control unit.
If a fuse blows repeatedly, never install a new one until the cause is eliminated! This may cause electronic damage or fire.