Nissan Primera P12: Complete Fuse and Relay Diagram (2001–2007)

Nissan Primera P12 (2001–2007) - a legendary sedan and hatchback that is still in demand on the secondary market. But even such a reliable car eventually develops electrical problems. Most often they are associated with **blown fuses** or faulty relays. If your headlights don't work, the audio system fails, or the windows stop opening, the first thing you should do is check the fuse box.

In this article you will find detailed description of all fuses and relays for Primera P12 (including restyled versions 2005–2007), their location, typical symptoms of malfunctions and step-by-step instructions for replacement. We will also look at which fuses most often fail and how to avoid diagnostic errors.

Where is the fuse box located in Nissan Primera P12

B Nissan Primera P12 There are two main fuse blocks:

• 🔧 Main unit — located in the cabin, under the instrument panel on the driver’s side. To access it, open the driver's door and remove the decorative cover (it is secured with latches).
• ⚡ Additional relay block — located in the engine compartment, next to the battery (in some versions, under a plastic cover near the windshield).

The photo below shows the exact location of the main block (click to enlarge):

Photo of the location of the fuse box

The image shows a plastic casing with the inscription "FUSE BOX". To remove it, pull the bottom edge towards you, then up. Be careful - the latches are fragile!

⚠️ Attention: In right-hand drive versions (for example, for the Japanese market), the location of the block may differ. Also on machines with Bose audio system or xenon headlights Individual fuses are added - their diagrams are given below.

Diagram and decoding of fuses in the cabin block

The main unit contains fuses that control most of the vehicle's electrical circuits. Below is a table with the purpose of each fuse (the numbers correspond to the designations on the block cover).

Number	Ampere	Purpose	Typical faults
1	10A	Interior lighting, instrument lighting	The interior lights don't light, the glove box light doesn't work.
5	15A	Audio system, navigation	The radio does not turn on, the settings are reset
10	20A	Window lifters (all 4 doors)	The windows do not work, the relay click is heard, but there is no movement
15	10A	Engine control unit (ECU)	If this fuse blows, the engine may not start or may malfunction (for example, code P0600)
20	15A	Cigarette lighter, 12V socket	Cigarette lighter does not work, devices do not charge

You can download the complete diagram of all 30+ fuses at link at the end of the article. Please note that on machines with automatic transmission fuse added #25 (10A) for the automatic transmission control unit - if it fails, jerks may be observed when shifting gears.

Relay in Nissan Primera P12: location and purpose

Next to the fuses in the cabin unit there are relays that are responsible for the key systems of the car. Their malfunction can manifest itself in different ways: from starter failure to non-functioning headlights. Below is a list of the main relays and their typical “symptoms”:

• 🔋 Starter relay - if you hear clicks when you turn the key, but the starter does not turn, check this relay (usually located under number R3).
• 💡 Low/high beam relay - if it fails, the headlights may flicker or not turn on at all.
• 🚗 Fuel pump relay - if the engine does not start and you cannot hear the pump running when you turn on the ignition, this relay is to blame (R7).
• 🔄 Cooling fan relay - if the fan does not turn on when overheated, check R5 and fuse #12 (20A).

⚠️ Attention: The fuel pump relay is often confused with the starter relay - they look similar, but are not interchangeable! There is usually a diagram on the block cover with symbols, but if there is none, check with our table.

How to properly replace a fuse or relay

Replacing a fuse is a simple procedure, but there are several nuances that will help you avoid mistakes:

1. Turn off the ignition and remove the negative terminal from the battery (this will prevent a short circuit).
2. Use tweezers included in the kit (usually located in the fuse box) or plastic pliers to remove the fuse.
3. Check the integrity of the thread inside the fuse - if it is blown, replace it with a new one same denomination.
4. If the fuse blows immediately after replacement, do not try to install a "bug" - this may lead to a fire!

To replace the relay, proceed in the same way, but note that relays are sensitive to moisture. If you are removing a relay to check, wipe its contacts with alcohol and make sure there is no condensation in the block.

Common problems with fuses and their solutions

Owners Primera P12 often encounter typical faults related to fuses. Here are the most common cases and how to resolve them:

• 🔊 Audio system fuse blows (#5, 15A) - most often the culprit is a short circuit in the speakers or a damaged power cable to the radio. Check the insulation of the wires behind the dashboard.
• 🚪 Power windows do not work (fuse #10, 20A) — if the fuse is intact, but the windows do not move, check the relay R4 and motors in the doors.
• 💥 Cigarette lighter fuse blows (#20, 15A) - this is usually associated with the use of powerful devices (for example, compressors). Replace the fuse with a 20A fuse, but no more!
• 🔥 ECU fuse (#15, 10A) blows when starting This is a serious problem, often caused by damaged wiring or a malfunction of the control unit itself. Diagnosis required.

⚠️ Attention: If you have an alarm or additional equipment installed (such as a hard-wired DVR), it can create a parasitic load on the circuits. In this case, the fuses will blow even when the ignition is turned off.

Where to buy fuses and relays for Primera P12

Fuses and relays for Nissan Primera P12 are not in short supply, but it is important to choose quality spare parts. Here are a few proven options:

• 🛒 Genuine Nissan fuses — sold at dealerships (item number for set: 28500-4M000). The most reliable, but also the most expensive option.
• 🔧 Analogues from Bosch or Hella - fit in size and denomination, are cheaper than the original. Look for markings Mini Blade for the salon unit.
• 🌍 Online stores (Exist, Autodoc, Emex) - convenient to order as a set. Pay attention to the seller's reviews!
• 🏬 Car shops near home — suitable in emergency cases, but check the quality of the fuses (sometimes you get defective ones).

The cost of fuses varies from 10 to 50 rubles per piece, relays - from 200 to 800 rubles. For the fuel pump and starter relay, it is better not to save money and take the original or proven analogues (for example, Febi Bilstein).

Troubleshooting: when the fuse is not to blame

Electrical problems are not always related to fuses. If the fault remains after replacing the fuse, check the following points:

• 🔌 Wiring — inspect the harnesses for frayed insulation, especially in bends (under the hood, near the doors).
• 📶 Weight - poor contact with ground can simulate a fuse failure. Clean the ground attachment points on the body.
• 🔧 Control unit - if the fuse is intact, but the system does not work (for example, the headlights do not turn on), the unit itself may be to blame (for example, BCM or ECU).
• 🔋 Battery - low voltage can cause relay malfunctions. Check the battery charge (must be at least 12.6V).

For in-depth diagnostics you will need multimeter. For example, to test a fuse circuit:

1. Turn on the ignition.
2. Connect one multimeter probe to the fuse terminal (positive side), the other to ground.
3. If there is no voltage, there is a problem with the power supply to the circuit (check the relay or wiring).

How to test a relay with a multimeter

Connect the probes to pins 85 and 86 of the relay. When 12V is applied to these contacts, a click should be heard and conductivity will appear between 30 and 87. If there is no click, the relay is faulty.

FAQ: Frequently asked questions about Primera P12 fuses

Is it possible to install a fuse of a higher rating if it constantly blows?

No! This may result in melted wiring or fire. If the fuse blows repeatedly, look for the cause - usually a short circuit or a faulty consumer (for example, a window lift motor).

Where is the fuse for the cigarette lighter?

This is a fuse #20 (15A) in the salon block. If the cigarette lighter does not work after replacing, also check the relay R6 and power circuit.

Why did all the windows stop working at the same time?

Most likely the fuse has blown #10 (20A) or the relay has failed R4. Also check the main power window lock switch (located on the driver's door).

Which fuse controls the instrument lighting?

The fuse controls the instrument panel lighting #1 (10A). If the backlight does not light up after replacement, check the lamps in the instrument panel or the control unit Combination Meter.

What to do if the fuse is intact, but the device does not work?

Check:

1. Voltage at the fuse (should be 12V when the ignition is on).
2. State of the relay in the circuit.
3. Integrity of wiring from fuse to device.
4. The device itself (for example, a window lift motor or a radio).