Nissan Teana J31 (2003–2008) is a reliable business-class sedan, but even it has electrical problems over time. Most often the culprit is burnt out fuses or relay. If your headlights, cigarette lighter, power windows or radio are not working, the first thing to do is check the fuse boxes. In this article you will find a complete diagram with an exact decoding of each fuse and relay for Teana J31 with gasoline engines VQ23DE (2.3 l) and VQ35DE (3.5 l), as well as practical advice on diagnostics and replacement.

We will not just list the purpose of fuses - we will show where exactly to look for blocks (and there are them in Teana J31 two: in the cabin and under the hood), how to remove them correctly, and what to look for when buying new ones. In addition, you will learn which fuses are most likely to fail and why. The information is relevant for all modifications, including restyled versions of 2006–2008.

Where are the fuse boxes in Nissan Teana J31

B Nissan Teana J31 There are two main fuse blocks:

  • 🚗 Salon block — located to the left of the steering column, behind the plastic cover. To gain access, you need to open the driver's door and unclip the lid latches.
  • 🔧 Engine compartment block — located next to the battery, in a plastic box with a lid. On some versions it may be additionally protected by a rubber cover.

There is also in the car additional relays, which can be located behind the glove compartment or under the center console. For example, the cooling fan relay is often located separately - it can be found next to the radiator.

Important: on versions with VQ35DE (3.5 l) engine compartment diagram may differ slightly from VQ23DE (2.3 l) due to the difference in the load on the electrical network. If you have a car with a 3.5 engine, pay attention to the fuses #30 (fuel pump) and #40 (ignition system) - they burn out more often.

📊 How often do you check the fuses in your car?
  • Only when something breaks
  • Once a year for prevention
  • Never checked
  • I change it myself at the first sign of trouble.

Interior fuse box: diagram and decoding

Salon block in Teana J31 contains fuses responsible for lighting, multimedia, climate control and comfort systems. Below is a table with the exact decoding for versions 2003–2008.

Fuse no. Denomination (A) Purpose Symptoms of a problem
1 10 Interior lighting, trunk lighting, instrument lighting The lamps do not light up, the panel backlight does not work
7 15 Cigarette lighter, 12V socket Cigarette lighter does not work, devices do not charge
12 10 Audio system, navigation (if installed) The radio does not turn on, there is no sound
18 20 Power windows (all 4 doors) Window regulators do not work or operate jerkily
25 10 Climate control unit The climate panel does not respond, the heater/air conditioner does not blow

Please note: fuse #7 (cigarette lighter) often burns out due to the use of powerful devices (for example, car vacuum cleaners or compressors). If it burns repeatedly, check 12V socket for short circuit — the wiring or contacts may be damaged.

⚠️ Attention: When replacing a fuse #18 (window regulators) do not use a fuse rated higher than 20A. This can lead to melting of the wiring in the doors!

Turn off the ignition and remove the key

Wear gloves (fuses may be hot)

Check the new fuse for compliance with the rating

Make sure there are no traces of melting in the socket -->

Engine compartment fuse and relay box: what is where

Engine compartment block Teana J31 is responsible for power electrics: ignition system, fuel pump, cooling fans and generator. The main relays are also located here. The block diagram may differ slightly depending on the year of manufacture and configuration, but the general structure remains the same.

Key fuses under the hood:

  • ⚡ #30 (15A) - fuel pump. If it burns out, the car will not start or stalls after a few seconds.
  • 🔥 #35 (10A) - ignition system (VQ35DE). If there is a malfunction, the engine stalls or does not start.
  • 💨 #40 (30A) - cooling fans. If burned out, the engine will overheat.
  • 🔋 #50 (100A, mega fuse) - main power relay. If it fails, the machine is completely de-energized.

Relays in the engine compartment are usually marked with letters (A, B, C etc.). For example:

  • 🔄 Relay A — main relay of the injection system. If it clicks but does not work, check its contacts.
  • 🌀 Relay D — cooling fan. Often sticks due to moisture.
⚠️ Attention: fuse #50 (100A) is the so-called “mega fuse”. It is designed for high currents and cannot be replaced with a regular car fuse. If it fails, diagnostics of the entire on-board network is required!
How to test a relay without a multimeter?

If you suspect that the relay is faulty, you can check it by ear and touch:

1. When you turn on the ignition, the relay should make a characteristic click.

2. After activation, its body should vibrate slightly (be careful - don’t get burned!).

3. If the relay is cold when it should be hot (for example, a fan relay after a long time of operation), most likely it does not work.

For an accurate check, it is better to use a multimeter in continuity mode or replace the relay with a known good one.

Which fuses in Nissan Teana J31 burn most often?

According to repair statistics and owner reviews, Teana J31 The most common fuses that fail are:

  1. Cigarette lighter (#7, 15A) - the fault is usually due to powerful consumers (compressors, inverters) or a short circuit in the outlet.
  2. Window lifters (#18, 20A) - burns out due to wear of the mechanism or moisture getting into the door wires.
  3. Fuel pump (#30, 15A) - may burn out during prolonged dry operation (for example, if the gas tank is almost empty).
  4. Cooling fans (#40, 30A) - often suffers due to overheating or sticking of the relay.
  5. Audio system (#12, 10A) - burns out when the radio is incorrectly connected or there is a short circuit in the speakers.

If the fuse burns again after replacement, don't increase its value! This can lead to melted wiring or even a fire. Instead:

  • 🔍 Check the circuit for short circuit with a multimeter.
  • 🛠️ Inspect the wires for damage (especially in doorways and under the hood).
  • 🔌 Disconnect all additional devices (radio tape recorders, alarms) that may have been connected abnormally.
💡

If the fuse #30 (fuel pump) burns out regularly, check the fuel level in the tank. Running the pump dry increases the load and can lead to overheating of the circuit.

How to properly replace a fuse: step-by-step instructions

Replacing the fuse in Nissan Teana J31 - a simple procedure, but requiring accuracy. Here is a step-by-step algorithm:

  1. Turn off the power — remove the key from the ignition and open the door (to avoid accidentally turning on the system).
  2. Find the block — the cabin unit is hidden behind a cover to the left of the steering wheel, the engine compartment is hidden next to the battery.
  3. Remove the cover — on the interior unit it is secured with latches; on the engine compartment, a screwdriver may be required.
  4. Identify the faulty fuse - visually (a burnt out one has a broken thread inside) or using a multimeter.
  5. Remove the fuse - use special tweezers (usually attached to the block cover) or pliers with insulated handles.
  6. Install new - it must be of the same denomination (color and markings are indicated on the case).
  7. Check circuit operation - turn on the ignition and make sure that the problem is resolved.

If after replacement the fuse burns out again, do not repeat the procedure This is a sign of a serious fault in the circuit. In such cases, it is better to contact an auto electrician for diagnosis.

💡

Never use "bugs" (homemade wire fuses) - this can lead to a fire in the wiring!

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

It happens that the fuse is visually intact, but the device (for example, a radio or power window) does not work. In this case, the problem may lie in:

  • 🔌 Relay — check its functionality (you can swap places with a known good one).
  • 🔌 Wiring — inspect the wires for breaks or oxidation of contacts.
  • 🔌 Masse - poor contact with the body can simulate a fuse failure.
  • 🔌 Control unit - if all circuits are working properly, the problem may be in the electronic module.

To check the relay:

  1. Remove the relay from its socket.
  2. Ring the contacts with a multimeter 85 And 86 (winding) - resistance should be in the range of 50–120 Ohms.
  3. Apply 12V to the contacts 85 And 86 - there should be a clicking sound and the contacts 30 And 87 close up.

If the relay is OK but the circuit is not working, check fuse in relay control circuit (usually this is a separate low-power fuse, for example, #5 in the cabin block).

Where to buy fuses for Nissan Teana J31 and what to look for

Fuses for Teana J31 They are sold at any auto store, but it is important to choose quality parts. Here's what you need to know:

  • 🏷️ Denomination - must exactly match the standard one (the color of the case is also important: for example, 10A - red, 15A - blue, 20A - yellow).
  • 🔍 Manufacturer - it is better to give preference to brands Hella, Bosch or Littlefuse. Cheap Chinese fuses may have inaccurate ratings.
  • 🛡️ Type - in Teana J31 fuses are used ATO/ATC (knife). For mega fuses (#50) need type MAXI.
  • 📦 Kit — it’s convenient to buy sets of fuses with tweezers (for example, HELLA 8ZF 357 036-121).

The cost of one fuse is from 10 to 50 rubles, a set - from 300 to 800 rubles. If you buy from an online store, pay attention to the reviews: sometimes you come across fakes with thin legs that do not hold well in the socket.

⚠️ Attention: Do not buy fuses labeled "FUSE" without indicating the rating - this is a sign of low-quality products. Original fuses always indicate the current (for example, "15A").

FAQ: Frequently asked questions about Nissan Teana J31 fuses

Is it possible to install a fuse of a higher rating if the standard one constantly burns out?

No, it's dangerous! The fuse is designed for a certain load, and if it blows, there is a problem in the circuit (short circuit or excessive current). Installing a fuse with a large rating can lead to melted wiring or even a fire. Instead, find and fix the cause of the burnout.

How to check a fuse without a multimeter?

Visually: a blown fuse has a broken thread inside the housing. You can also use a “continuity test” from a light bulb and a battery: if the light bulb does not light up when connected to the fuse contacts, it is faulty. Another way is to replace the suspected fuse with a known good one of the same rating.

Where is the fuse for the cigarette lighter in Teana J31?

The cigarette lighter fuse is #7 (15A) in the interior fuse box (to the left of the steering wheel). If it burns out again after replacing, check the 12V outlet for a short circuit or the devices connected to it.

Why doesn't the cooling fan turn on even though the fuse is intact?

There may be several reasons:

  • Fan relay is faulty (check relay D in the engine compartment).
  • The coolant temperature sensor has failed.
  • Open circuit in the fan power supply (check the wires near the radiator).
  • The fan itself is faulty (supply 12V directly to it - if it doesn’t spin, it needs replacement).
Which fuses control the headlights in Teana J31?

For low and high beams in Teana J31 answer:

  • Low beam (left headlight) - fuse #20 (10A) in the cabin block.
  • Low beam (right headlight) - fuse #21 (10A).
  • High beam (both headlights) - fuse #22 (10A).

If the fuses are good but the headlights do not work, check the relay B in the engine compartment and lamps in the headlights.