Nissan KE909-99931: full code decoding, analogues and where to buy at the best price

If you are a car owner Nissan and came across the code KE909-99931, you probably wondered: what kind of part is this, where is it used and how not to run into a fake when buying. This article belongs to the category of original spare parts, which often cause confusion due to similar names in catalogs. Unlike universal consumables, KE909-99931 is a specialized component that is installed on a limited number of models Nissan And Infiniti.

In this article we will analyze not only the technical characteristics and purpose of the part, but also current prices for 2026, trusted suppliers, as well as installation nuances that even official dealers are silent about. You will find out why some technicians recommend replacing KE909-99931 to analogue from Denso or Hitachi, while others insist exclusively on the original. And most importantly, how to avoid mistakes when choosing, which lead to repeated repairs after 10–15 thousand km.

What does the KE909-99931 code mean: explanation and scope

Article KE909-99931 belongs to the system electrical equipment car and means control unit relay (or host computer relay, depending on the model). This is not just a fuse or a standard relay - the part is responsible for stabilizing the voltage in circuits associated with:

• 🔌 Electronic engine control unit (ECU) - in models with the system Direct Adaptive Steering;
• 🚗 Adaptive cruise control (ProPILOT Assist in new Nissan);
• 💡 Lighting system - in cars with Intelligent Auto Headlights (For example, Nissan X-Trail T32).

Important: KE909-99931 often confused with KE909-99930 or KE909-99932, but these articles are not interchangeable. For example, KE909-99930 used in hybrid systems e-POWER, and KE909-99932 - in models with diesel engines YD25DDTi. Installing the wrong relay can lead to malfunctions CAN buses or complete refusal immobilizer.

To accurately determine whether it is suitable KE909-99931 for your car, check:

1. VIN code via service Nissan Parts Europe;
2. The inscription on the relay itself (must contain the marking KE909-99931 REV.A or REV.B);
3. Winding resistance (for the original - 75–85 Ohm).

What Nissan and Infiniti models does KE909-99931 fit on?

Official catalogs Nissan indicate that KE909-99931 installed on the following cars:

Model	Years of manufacture	Engine	Note
Nissan Qashqai (J11)	2013–2021	HR16DE, MR20DD	Only with system Around View Monitor
Nissan X-Trail (T32)	2014–2022	MR20DD, QR25DE	Not compatible with hybrid versions
Infiniti QX50 (L50)	2019–present	VC-Turbo (KR20DDET)	ECU firmware required after replacement
Nissan Murano (Z52)	2015–2020	VQ35DD	For US and Canadian markets only

⚠️ Attention: On Nissan Juke (F15) and Kicks a relay with a similar part number was installed KE909-99931S (letter S at the end!). It is externally identical, but has a different response time (12 ms against 8 ms from the original). Installing the wrong version will result in an error P0606 (ECU malfunction).

If your model is not listed in the table, but the electrical system exhibits symptoms of a relay malfunction (for example, spontaneous shutdown ProPILOT or dashboard flickering), check:

• 🔧 Condition of contacts in the fuse box (oxidation or scorching);
• 📊 Error logs via Nissan Consult III+ (codes U1000 or C1130 often indicate a problem with the relay);
• 🔋 Output voltage 87a relay when the ignition is on (should be 12.4–12.6 V).

Signs of malfunction KE909-99931: when is it time to change

Relay KE909-99931 rarely fails suddenly - usually the malfunction develops gradually. Here are the key symptoms that should alert you:

⚠️ Attention: If the problem persists after replacing the relay, check body weight at the point E38 (under the battery). In 30% of cases, unstable operation of the electronics is associated with corrosion in this place, and not with the relay itself.

• ⚡ Driver assistance systems switch off spontaneously (LDW, BSW);
• 🔄 Cyclic reboot of the multimedia system (screen NissanConnect);
• 🚨 Error U1001 on the dashboard (loss of communication with ECU);
• 🔋 On-board power surges (with 14.2 V to 9.8 V with the engine running).

The last point is especially dangerous: long-term voltage sags can damage the automatic transmission control unit (in Nissan with variator JF017E) or ESP module. If you notice that when you turn on the headlights or air conditioning, the voltmeter needle drops below 11 V, immediately:

1. Turn off all power consumers;
2. Check the voltage at the battery terminals with the engine off (must be 12.6–12.8 V);
3. If the voltage is normal, the relay is to blame KE909-99931 or its chains.

How to test a relay without a multimeter?

If you don’t have a tester at hand, you can temporarily install a known-good relay (for example, from a heated seat system, if it matches the contacts). If the symptoms disappear, the problem is in KE909-99931. Important: Do not use this method for more than 1 day as the heater relay is not designed for high ECU currents.

Original vs analogues: what to choose and why

Original relay KE909-99931 from Nissan costs from 4,500 to 7,800 ₽ depending on the supplier. However, there are analogues on the market that are cheaper, but do not always live up to expectations. Let's look at the pros and cons of each option:

Manufacturer	Article	Price, ₽	Pros	Cons
Nissan (original)	KE909-99931	4 500–7 800	100% compatible, 2 year warranty	High price, risk of counterfeit
Denso	553-0106	2 800–3 500	The quality is not inferior to the original	Not suitable for all models Infiniti
Hitachi	RLY-003	2 200–2 900	Low price, wide range	Service life is 20–30% less than the original
Meat & Doria	9931-KE909	1 800–2 400	Budget option	Frequent complaints about the quality of contacts

⚠️ Attention: If you choose an analogue, be sure to check response time (indicated in milliseconds on the relay body). For Nissan Qashqai J11 with the system ProPILOT permissible deviation - no more ±1 ms. Otherwise, false activation of the brake system is possible.

What else to pay attention to when purchasing:

• 🏷️ Hologram on packaging - original relays Nissan supplied in boxes with a silver hologram and QR code;
• 🔍 Markings on the body - must be laser engraved and not painted;
• 📦 Equipment — the original always contains a silicone gasket to protect against moisture.

Where to buy KE909-99931: verified suppliers and prices for 2026

Prices for KE909-99931 vary greatly depending on region and method of purchase. Below are current offers for June 2026, including delivery:

Supplier	Price, ₽	Delivery time	Features
Official Nissan dealer	6 800–7 500	1–3 days	24 month warranty, VIN check
EXIST.ru	4 200–5 100	2–5 days	Frequent discounts, original and analogues
Partsouq (UAE)	3 800–4 500	10–14 days	Low prices, but risk of customs delays
AliExpress	2 500–3 200	20–40 days	High risk of counterfeit, no guarantee
Local showdowns	1 500–2 800	1 day	Used parts, contacts may be worn

If you buy a relay at AliExpress or eBay, required:

1. Request a photo of the part indicating the production date (on the original it is printed on the back side);
2. Check the seller's reviews - reliable suppliers have no lower ratings 98.5%;
3. Use buyer protection and pay only after receiving and checking the item.

For residents of Moscow and St. Petersburg, the best option is to order through EXIST.ru or AutoDoc with pickup. This will save on shipping costs and immediately check the part on site.

Step-by-step instructions for replacing KE909-99931

Relay replacement KE909-99931 does not require special skills, but it is important to follow the sequence of actions so as not to damage the connectors or cause a short circuit. You will need:

• 🔧 Flat screwdriver (for removing the fuse box cover);
• 🔌 Multimeter (to check voltage);
• 🧤 Gloves (so as not to leave fat marks on the contacts).

Replacement sequence:

1. Disable battery weight (disconnect the negative terminal).
2. Remove the interior fuse box cover (located to the left of the steering column).
3. Find the relay KE909-99931 - it is usually installed in the slot F37 or F42 (see diagram on the back of the cover).
4. Carefully remove the old relay by pulling it up (do not use excessive force!).
5. Install the new relay, making sure that the contacts match in shape.
6. Connect the battery ground and check the operation of the systems.

⚠️ Attention: After replacing the relay, it may be necessary to reset the adaptations in the unit ECU. To do this:

• Start the engine and let it idle 5–7 minutes;
• Turn off the ignition and turn it on again after 30 seconds;
• If the dashboard lights up Check Engine, reset errors via Nissan Consult or adapter ELM327.

If problems persist after replacement, check:

• 🔌 Wiring integrity from relay to ECU (wires near the pedal assembly often fray);
• 📶 Pulp quality on the body (point E38);
• 🔋 Battery voltage (if it is lower 12.4 V, the relay may not work correctly).

Common replacement mistakes and how to avoid them

Even experienced car owners make mistakes when working with KE909-99931. Here are the most common ones and how to prevent them:

• 🔄 Installing a relay from another model (For example, KE909-99930 instead of KE909-99931). Consequences: system failure ProPILOT or constant burning Check Engine.
• 🔌 Ignoring contact oxidation in the fuse box sockets. Consequences: the relay will overheat and fail in 1–2 months.
• 🛠️ Use of force when removing the relay. Consequences: damage to the plastic latches of the unit, which will require its complete replacement.
• 📱 Failure to reset ECU adaptations after replacement. Consequences: Incorrect operation of the throttle valve or automatic transmission.

To avoid these problems, follow these simple rules:

1. Always check the relay part number with official Nissan base;
2. Before installation, clean the fuse block contacts with alcohol or a special cleaner. Kontakt 60;
3. If the relay is tight, do not pull it - gently rock it from side to side;
4. After replacement, be sure to perform the throttle valve learning procedure (to do this:

1. Включите зажигание (не заводите двигатель).
2. Нажмите педаль газа до упора и удерживайте 5 секунд.
3. Отпустите педаль, выключите зажигание.
4. Заведите двигатель и дайте ему поработать 1 минуту на холостых.

If you are not confident in your abilities, it is better to contact the service. Average replacement cost KE909-99931 in Moscow - 1 500–2 500 ₽, but it will save you the risk of costly mistakes.

FAQ: answers to frequently asked questions about KE909-99931

Can Nissan's KE909-99931 be used on an Infiniti QX50?

Yes, but only if your Infiniti QX50 released until 2021. 2022 and newer models use a modified relay KE909-99931A with a different operating algorithm. Installing an old version will result in an error U1010 (firmware incompatibility).

What happens if you drive with a faulty KE909-99931?

The consequences depend on the car model:

• On Nissan Qashqai J11 - system failure Around View Monitor and false positives ESP;
• On Nissan X-Trail T32 - inability to activate ProPILOT Assist;
• On Infiniti QX50 — transition to emergency mode with engine power limited to 60%.

In the long run, a faulty relay can cause damage ECU control unit, the repair of which will cost 30 000–50 000 ₽.

How to distinguish an original relay from a fake?

Original relay KE909-99931 has the following characteristics:

• The case is made of matte black plastic (fakes have a glossy one);
• Inscription NISSAN and the article number are engraved with laser (not paint);
• On the reverse side there is a production date in the format YYMM (For example, 2305 - May 2023);
• Includes silicone gasket with logo Nissan.

Counterfeits often weigh 5–7 grams smaller than the original due to the use of thinner contacts.

Can KE909-99931 be repaired?

Theoretically yes, but it is impractical. The relay consists of:

• Windings (often burns out during power surges);
• Contacts (oxidize or burn);
• Plastic case (cracks when overheated).

Repairs will cost 1 500–2 000 ₽ (taking into account diagnostics), while a new relay costs from 2 800 ₽. In addition, after repair there is no guarantee of reliability - there is a high risk of repeated failure.

Where is the KE909-99931 relay located in the Nissan X-Trail T32?

B Nissan X-Trail T32 relay KE909-99931 located in internal fuse box (cabin block). Exact location:

1. Open the fuse box cover (to the left of the steering column, next to the clutch pedal);
2. Locate the relay in the slot F42 (in the diagram on the back of the cover it is indicated as Main Relay);
3. For ease of access, remove the plastic trim under the steering wheel (attached with 2 clips).

⚠️ Do not confuse with relay KE909-99930, which is in the same block, but in the slot F37!