<em>Nissan Tiida</em> air conditioning relay: location, faults and DIY replacement

Nissan Tiida is a popular compact car, but its air conditioning system often becomes a source of headaches for owners. One of the most common problems is failure air conditioner relay, which is responsible for turning on the compressor. If the climate control stops working, makes strange sounds, or only works every once in a while, this small but critical device may be the culprit.

In this article we will look at where the air conditioner relay is located on Tiida (including modifications C11 And C13), how to check it with a multimeter, what symptoms indicate a breakdown, and how to replace it without contacting service. You will also find relay compatibility table for different years of manufacture, connection diagrams and answers to frequently asked questions.

Where is the air conditioning relay located on a Nissan Tiida?

B Nissan Tiida The air conditioning relay is located in fuse and relay box under the hood. The exact location depends on the year of manufacture and modification:

• 🔧 Tiida C11 (2004–2010): The unit is located to the left of the battery, under the plastic cover. The A/C relay is usually labeled as AC RELAY or COMPRESSOR CLUTCH RELAY.
• 🔧 Tiida C13 (2010–2016): The fuse box has been moved closer to the windshield, next to the washer reservoir. The relay can be labeled as A/C RELAY or have a number K27.
• 🔧 Tiida Latio/Verso: similar C11, but sometimes the relay is placed in a separate block next to the compressor.

To accurately identify a relay, pay attention to its color and marking. Original relay from Nissan usually black or dark gray with a white label. On some modifications it may be hidden under additional plastic protection.

Symptoms of a bad air conditioning relay

A relay failure is not as obvious as, for example, a freon leak. Here are the key symptoms to watch out for:

• ❄️ The air conditioner turns on, but turns off after 1–2 seconds (protection is triggered).
• 🔊 When the climate control is activated, you can hear click under the hood, but the compressor does not start.
• 🚗 Air conditioning works only at high speeds or when driving, and turns off at idle.
• ⚡ Lights up on the dashboard Check Engine or error P0530 (A/C relay circuit malfunction).
• 🔥 Relay gets hot or smells like burning when trying to turn on the air conditioner.

It is important to distinguish a relay malfunction from problems with air conditioner fuse (usually 10A or 15A), freon pressure sensor or compressor clutch. If the fuse blows immediately after replacement, the problem is likely a short circuit rather than a relay problem.

⚠️ Attention: If the air conditioner turns on but blows warm air, the problem may be freon leak or clogged capacitor. The relay has nothing to do with it!

How to test an air conditioner relay with a multimeter

Before replacing the relay, it must be checked. For this you will need multimeter (in resistance or circuit test mode) and wire with voltage 12V (you can use a battery). Follow the instructions:

1. Remove the relay from the block (carefully pry it off with a screwdriver or your fingers).
2. Inspect the contacts for oxidation, melting or corrosion.
3. Ring the winding:
   • Connect the multimeter probes to the terminals 85 And 86 (see diagram below).
   • Resistance must be within 50–120 Ohm. If the device shows 0 (short circuit) or ∞ (break), the relay is faulty.
4. Check the functionality of the contacts:
   • Connect 12V to conclusions 85 And 86 (polarity is not important).
   • You should hear click - this means that contacts 30 And 87 closed up.
   • Ring conclusions 30 And 87 - there must be resistance 0 ohm.

If the relay does not click or the contacts do not close, it must be replaced. Also check fuse box connector — often oxidation of contacts leads to false alarms.

Relay pinout diagram

Contact numbering is standard for 4-pin relays:

- 85, 86 — coil (control contacts)

- 30 - common contact (powered by battery)

- 87 - normally open contact (goes to the compressor)

On some relays the contacts may be labeled 87a (normally closed), but Tiida does not use this.

Relay compatibility table for Nissan Tiida

Not all relays are suitable for Tiida, even if they look the same on the outside. Below is a table of compatibility of original and analog relays for different years of manufacture:

Model Tiida	Original number	Analogs (brand, article)	Notes
C11 (2004–2007)	25230-4M000	Hella 4RA 003 507-011 Bosch 0 332 209 150	Suitable for models with climate control
C11 (2008–2010)	25230-4M001	Valeo 403001 Febi 11476	May require contact improvements
C13 (2010–2016)	25230-4M010	Standard Motor Products RU-301 Meat & Doria 88010	Compatible with Tiida Latio
All models	—	Omron G2R-14 (universal)	Requires checking according to the connection diagram

Important: Relay from Nissan Almera N16 (article 25230-4M005) is identical in appearance, but has a different coil resistance and is not suitable for Tiida!

Step-by-step instructions for replacing the air conditioning relay

Replacing the relay is a simple procedure that will take no more than 10 minutes. You will need:

• 🔧 Flat screwdriver (for removing the block cover).
• 🔍 Flashlight (to better see the markings).
• 🧤 Gloves (optional, so as not to get your hands dirty).

1. Turn off the ignition and remove the negative terminal from the battery

2. Locate the fuse box under the hood

3. Remove the plastic cover of the unit (carefully prying up the latches)

4. Find the air conditioning relay (check the photo in the manual) -->

Step 1. Open the hood and locate the fuse box. On Tiida C11 it is located to the left of the battery, on C13 — closer to the windshield. Remove the plastic cover by pressing the latches on the sides.

Step 2. Find the air conditioning relay. It can be signed as AC RELAY or have a number K27. If the inscriptions are erased, refer to photo of the block (see below).

Step 3. Carefully remove the relay by pulling it up. If it gets stuck, don’t use force—it’s better to rock it from side to side.

Step 4. Install the new relay, making sure it is seated all the way. Check that the contacts are not bent.

Step 5. Replace the unit cover, connect the battery terminal and check the operation of the air conditioner. If the problem persists, check fuse (usually F37 at 10A) or freon pressure sensor.

⚠️ Attention: If after replacing the relay the air conditioner is unstable (turns on with a delay), check weight on the body next to the fuse box. Often oxidation of the mass contact leads to similar symptoms.

Frequent mistakes during diagnostics and repairs

Many owners Tiida make mistakes that complicate troubleshooting. Here are the most common:

• 🔍 Ignoring the fuse. Before replacing the relay, always check the A/C fuse (usually 10A or 15A). Its burnout may indicate a short circuit in the circuit.
• 🔧 Fan relay confusion. On Tiida Next to the air conditioning relay there is often a radiator fan relay (RADIATOR FAN RELAY). They look similar, but are not interchangeable!
• 📉 Failure to check freon pressure. If there is little freon in the system, pressure sensor blocks the compressor from turning on, and the problem may appear to be a faulty relay.
• 🔌 Replacing the relay without checking the connector. Oxidated or burnt contacts in the fuse box can cause the same symptoms as a faulty relay.

If the air conditioner still does not operate after replacing the relay, perform full diagnostics:

1. Check relay connector voltage (must be 12V on contact 30 with the ignition on).
2. Make sure compressor rotates (when the air conditioner is turned on, its pulley should rotate with noticeable effort).
3. Check compressor belt condition - if it slips, the clutch will not operate.

Relay cost and where to buy it

Air conditioner relay price for Nissan Tiida Varies depending on brand and place of purchase:

• 🏷️ Original relay (Nissan 25230-4M000): 1 200–1 800 ₽ (at official dealers).
• 🏷️ Analogues (Hella, Bosch, Valeo): 400–900 ₽ (in car dealerships or at Wildberries/Ozon).
• 🏷️ Universal relays (Omron, Song Chuan): 200–500 ₽, but require compatibility testing.

Where to buy:

• 🛒 Official dealers Nissan - guarantee of original quality, but high price.
• 🛒 Specialty stores (For example, Exist.ru, Avtodetal) - a wide range of analogues.
• 🛒 Marketplace (Wildberries, Ozon, AliExpress) - cheaper, but there is a risk of running into a fake. Always check reviews!

⚠️ Attention: When purchasing a relay at AliExpress pay attention to coil resistance (must be 80–100 Ohm) and maximum current (no less 30A). Cheap relays often cannot withstand the load and quickly burn out.

💡

If you buy a universal relay, make sure it is 4-pin (type SPST) and is designed for 12V. Relay on 24V or with 5 contacts will not work!

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

Is it possible to drive without an air conditioning relay?

Technically yes, but the air conditioning won't work. However not recommended leaving an empty socket in the fuse box - this may lead to oxidation of the contacts or a short circuit. If the relay burns out, it is better to temporarily install a known good one (for example, from a heater fan).

Why does a new relay burn out quickly?

This indicates problems in the circuit:

• Short circuit in wiring (check harness from relay to compressor).
• Malfunction compressor clutch (if it is jammed, the current increases sharply).
• Poor ground on the body (check the ground contact near the fuse box).

If the relay burns out repeatedly, contact an auto electrician for a full diagnosis.

How to distinguish an air conditioner relay from a fan relay?

On Tiida These relays are often side by side, but have different characteristics:

• Air conditioner relay usually marked AC RELAY or K27, has coil resistance 80–100 Ohm.
• Fan relay marked RADIATOR FAN RELAY or K28, coil resistance 120–150 Ohm.

You can also temporarily swap them - if the air conditioner starts working, but the fan stops, it means you have mixed up the relay.

What should I do if, after replacing the relay, the air conditioner still does not work?

Check the following items:

1. fuse (usually F37 at 10A).
2. Freon pressure sensor (if there is little freon, it blocks the compressor from turning on).
3. Compressor clutch (check if the pulley rotates when the air conditioner is on).
4. Wiring from the relay to the compressor (there may be a break or short circuit).
5. Climate control ECU (rarely, but it happens that the problem is there).

If you cannot find the cause yourself, contact a diagnostician to read the errors (P0530, P0531 etc.).

Is it possible to repair a burnt out relay?

Theoretically yes, but not recommended. A relay is an electromechanical device, and if the contacts or windings burn out, it is almost impossible to restore its reliability. It is better to buy a new one (the cost is low) or temporarily use a known good one from another unit (for example, a high beam relay).

If you still want to try to repair:

• Disassemble the relay (carefully unbending the latches).
• Clean your contacts 30 And 87 from carbon deposits (you can use fine sandpaper).
• Check the integrity of the spring and winding.

However, such a repair is a temporary solution, and soon the relay will fail again.