Nissan Note air conditioner relay: diagnostics, replacement and common errors

Air conditioning in Nissan Note is one of those systems that makes travel comfortable in the heat, but its operation directly depends on small but critical details. One of them is the **air conditioning relay**, which often becomes the source of problems: from failure to turn on the compressor to complete failure of the climate system. Owners Note (especially models E11 And E12) often encounter the fact that the air conditioner suddenly stops blowing cold air, although the freon is charged and the fan is running.

In this article we will look at how the air conditioner relay works in Nissan Note, where to look for it under the hood, what signs to identify a malfunction and how to replace the part yourself - without contacting service. We will also analyze common diagnostic errors (for example, confusing the air conditioner relay with fan relay or compressor fuse) and give a checklist for checking the electrical circuit. For clarity, we provide connection diagrams and a relay compatibility table for different years of manufacture Note.

Where is the air conditioning relay located in a Nissan Note?

B Nissan Note The air conditioning relay is located in the **fuse and relay mounting block**, which is located in the engine compartment. The exact location depends on the year of manufacture and modification:

• 📍 Note E11 (2004–2012): fuse box on the right (in the direction of travel) next to the battery, under the plastic cover. The A/C relay is usually labeled as AC COMP RY or A/C RELAY.
• 📍 Note E12 (2012–2020): the unit has been moved closer to the windshield, also under the cover. The relay can be marked MAGNET CLUTCH RELAY (compressor clutch relay).
• 📍 Note with hybrid system (e-Power): the relay is integrated into the climate control unit, access to it is more difficult - the panel must be removed.

To avoid confusion, refer to the block diagram (usually printed on the inside of the cover). A/C relay Note most often has black or dark gray housing with markings 80A or 12V. If there is no circuit, use a multimeter to check (more on this below).

⚠️ Attention: In some versions Note (for example, with an engine HR15DE) the air conditioning relay is duplicated in the interior fuse box (under the steering wheel). If you don't find it under the hood, check this block too!

Symptoms of a bad air conditioning relay

A/C relay Nissan Note it fails gradually, and the first symptoms are often ignored, attributed to electronic “glitches.” Here are the key signs that the problem is in the relay:

• ❄️ The air conditioner turns on, but the compressor does not work (no characteristic clicking or vibration).
• 🔄 Climate control works unstable: sometimes it blows cold, sometimes warm air.
• 🔌 When you turn on the air conditioner fuse trips (more often 10A or 15A in the compressor circuit).
• 🚨 Lights up on the dashboard A/C error (code P0530 or P0532 during diagnosis).
• 🔋 The battery discharges faster than usual (the relay “sticks” and constantly supplies voltage to the compressor).

It is important to distinguish a relay malfunction from problems with freon pressure sensor, compressor clutch or electrical wiring. For example, if you hear a click when you turn on the air conditioner, but the compressor does not spin, the clutch is to blame, not the relay. And if there is no click at all, check the relay and fuse.

What to do if the air conditioner only turns on at high speeds?

This is a typical symptom worn relay or low freon pressure. At rpms above 2000–2500, the compressor receives enough voltage to operate, but at idle the relay “does not reach it.” Check the pressure in the system with a pressure gauge (standard for Note: 2-3 bar at idle).

⚠️ Attention: If a burning smell appears in the cabin when you turn on the air conditioning, this is a sign short circuit in the relay circuit or burnt compressor contacts. Immediately turn off the air conditioner and check the fuse box!

How to test an air conditioner relay with a multimeter

Checking the air conditioner relay Nissan Note takes 10–15 minutes and does not require special skills. You will need multimeter (or even a simple 12V light bulb) and a screwdriver. Follow the algorithm:

1. Remove the relay from the block (pull up, sometimes you need to press the latch).
2. Ring the winding: connect the multimeter probes to the terminals 85 And 86 (usually these are control contacts). There must be resistance 50–120 Ohm. If “infinity” is a break, if zero is a short circuit.
3. Check your contacts: Apply 12V to 85 And 86 (possible from battery). You should hear a click - this means that the contacts 30 And 87 closed up. Ring them: resistance should be ~0 Ohm.

If the relay does not click or the contacts do not close, it is faulty. Also inspect the relay legs for melting or oxidation (especially relevant for Note with a mileage of 150 thousand km).

Remove the relay from the fuse box

Ring the winding (contacts 85–86)

Apply 12V to control contacts

Check the short circuit of the power circuit (30–87)

Inspect the legs for melting -->

Relay contact	Purpose	Normal value
85	Control "-" (ground)	Resistance with 86: 50–120 ohms
86	Control "+" (12V)	When 12V is supplied there is a click
30	Power "+" (from battery)	Voltage: 12V (with ignition on)
87	Power output (to compressor)	Resistance with 30: 0 Ohm (when triggered)

Step-by-step replacement of the air conditioning relay in a Nissan Note

If the diagnostics confirm that the relay is faulty, replace it with Nissan Note possible in 5 minutes. The main thing is to use analogue with the same parameters (voltage, current, contact type). Suitable relays:

• 🔧 Original: Nissan 25230-4M000 (for Note E11) or 25230-4M010 (for E12).
• 🔧 Analogues: Omron G8H-1A4-T, TE Connectivity 1-1439252-1, Bosch 0 332 019 150.
• 🔧 Universal: relays with markings 12V 30/40A and connector 85–86–30–87.

Replacement instructions:

1. Disable negative battery terminal (required!).
2. Remove the fuse box cover under the hood (unclip the clips).
3. Find the air conditioning relay (see diagram on the cover or photo above).
4. Pull the relay up, wiggling it a little. If it doesn’t work, pry it off with a screwdriver.
5. Install a new relay until it clicks (contacts must match!).
6. Connect the battery and check the operation of the air conditioner.

⚠️ Attention: After replacing the relay be sure to reset the ECU errors (if they were). To do this, disconnect the battery for 10 minutes or use a diagnostic scanner (for example, ELM327). Otherwise, the air conditioner may not turn on due to a stuck error. P0532.

Typical mistakes during diagnostics and repair

Even experienced car owners make mistakes when working with the air conditioning relay in Nissan Note. Here are the most common:

• 🔍 Confusing the air conditioner relay with the fan relay. B Note they are often side by side, but the fan is responsible for blowing the radiator, and not the compressor.
• 🔌 Don't check the fuse. If it is burned out, the relay will not receive a control signal and the air conditioner will not turn on.
• 🛠️ Use relays with other parameters. For example, they put a relay at 20A instead of 30A - it burns out quickly.
• 📉 Ignore freon pressure. At low pressure, the sensor blocks the operation of the compressor, and the relay has nothing to do with it.
• 🔋 Do not clean the block contacts. Oxidized connectors can simulate a relay failure.

Another common mistake is checking the relay without removing it. If you simply click the relay in place, you will not see a problem with the contacts inside the block. Always remove the relay for a complete diagnosis!

Relay cost and alternative solutions

Air conditioner relay price for Nissan Note depends on the type and manufacturer:

Relay type	Manufacturer	Article	Price, rub.
Original	Nissan	25230-4M000	1 200–1 800
Analogue premium	Omron	G8H-1A4-T	800–1 200
Universal	Bosch	0 332 019 150	400–700
Budget	ERA	550347	250–400

If the original relay is too expensive, you can use analogues from Omron or Bosch — they are not inferior in reliability. The main thing is that the relay is hermetically sealed (with cover) - this protects the contacts from oxidation.

⚠️ Attention: In some cases (for example, if the relay winding is broken), the air conditioner can be temporarily “started” by closing the contacts 30 And 87 jumper. But this is dangerous: the compressor will work constantly, which will lead to its overheating and failure! Use this method only to test the circuit.

FAQ: Frequently asked questions about the Nissan Note air conditioning relay

Is it possible to drive without an air conditioning relay?

Technically yes, but the air conditioning won't work. If the relay is removed completely, the compressor will not turn on, but this will not affect other vehicle systems. However, in hot weather this will create discomfort, and if you drive for a long time without air conditioning, the interior may overheat.

Why does a new relay burn out quickly?

This is a sign short circuit in the compressor circuit or clutch problems. Check the resistance of the coupling winding (should be 3-5 ohms). If it is lower, the clutch “shorts” and kills the relay. Also inspect the wiring for frayed wires.

How to distinguish a relay failure from a compressor failure?

If the relay is working properly (clicks when 12V is supplied), but the compressor does not turn on:

1. Check fuse in the compressor circuit.
2. Measure clutch voltage (should be 12V when the air conditioner is on).
3. Rotate the compressor manually (with the engine off) - if it jams, repairs will be required.

Can the A/C relay be repaired?

In most cases, no - the relay is not separable, and attempts to solder the contacts will lead to an unreliable connection. Exception: if the legs have oxidized, they can be cleaned with sandpaper. But if the winding breaks or the contacts burn, the only thing to do is replace it.

Which relay is suitable for other Nissan models?

Air conditioner relay from Nissan Micra K13, Juke F15 or Almera G15 fully compatible with Note E11/E12. The main thing is that the contacts and current match (30–40A). Relays from Renault Sandero And Dacia Logan (they use the same platforms).