Airbag control unit with part number NNW502436DDTBB

What is the function of the airbag control unit NNW502436DDTBB?

The airbag control unit with part number NNW502436DDTBB is the central control module for the passive safety system (Supplemental Restraint System, SRS) in vehicles such as the Land Rover Discovery 3 and the Rover Range Rover Westminster. It processes signals from crash sensors and determines whether and when airbags and seatbelt pretensioners should be deployed.

This component serves as the brain of the entire restraint system. It continuously monitors all connected sensors and actuators to ensure a millisecond‑fast response in the event of a collision. Proper functionality is critical for occupant protection.

Technically, this control unit is functionally identical to the variants known under part numbers NNW502436 or LR067254. Therefore, these numbers can be considered equivalent during diagnosis or replacement.

Why does the NNW502436DDTBB control unit fail?

The most common cause of failure for the NNW502436DDTBB control unit is the storage of crash data after an accident. Additional defects arise from internal electronic malfunctions, water damage, or issues with wiring and connectors. These faults block functionality and disable the entire airbag system.

Following a collision—even a minor one—the control unit stores what is known as a “crash event.” This data locks the unit and prevents re‑deployment until it is professionally reset or repaired. This is a manufacturer‑specified safety measure.

Besides accidents, everyday factors also contribute to failures. Water ingress—often due to leaks in the vehicle body—can lead to corrosion on the circuit board and short circuits. Internal faults in electronic components such as processors or memory chips, as well as broken wires or defective connectors, are also frequent causes of failure.

How do you recognize a defect in the NNW502436DDTBB control unit?

A defect in the NNW502436DDTBB airbag control unit primarily manifests as a permanently illuminated or flashing SRS warning light on the instrument panel. Additionally, the airbags are deactivated, and diagnostic tools often cannot communicate with the control unit or read specific fault codes such as B0028.

The most noticeable symptom is the airbag warning light. If the driver ignores this warning, the airbags and seatbelt pretensioners will offer no protection in the event of a crash, significantly increasing the risk of injury. An immediate visit to a workshop is therefore strongly advised.

In the workshop, the defect is often confirmed through concrete diagnostic results. A typical fault code is B0028, indicating a problem in the airbag deployment circuit. An even clearer sign is when the diagnostic tool cannot establish any connection to the SRS control unit at all, pointing to a serious internal malfunction.

In which vehicles is the NNW502436DDTBB control unit installed?

The airbag control unit with part number NNW502436DDTBB is specifically found in certain models of Land Rover and Rover. Repair services are available for the Land Rover Discovery 3 and the Rover Range Rover Westminster, where this component manages the restraint system.

At Airbag24, we repair the NNW502436DDTBB part number and functionally identical variants for the following vehicles:

Land Rover Discovery 3 (model years 2004–2009)

Rover Range Rover Westminster

Is repairing the NNW502436DDTBB worthwhile?

Yes, repairing the airbag control unit is a highly economical and safe alternative to costly new purchases. Not only can you save up to 70% of the cost, but you also retain the vehicle’s original coding, eliminating the need for time‑consuming reprogramming.

A key advantage is the substantial cost savings. While a new part from the manufacturer can cost up to 800 euros, professional repair costs are significantly lower. At the same time, full functionality of this life‑saving safety system is restored.

Since the original control unit is repaired, all vehicle‑specific data and coding remain intact. After repair, the unit can simply be reinstalled (plug-and-play) and immediately operational. This avoids additional workshop expenses and complications that may arise when adapting a new or used control unit.

Furthermore, every repair comes with a 12‑month warranty, giving you confidence that you’ve chosen a reliable, long‑lasting solution for your vehicle.

How is the NNW502436DDTBB control unit professionally repaired?

Professional repair at Airbag24 begins with a detailed diagnosis of the submitted control unit. Subsequently, fault causes—such as stored crash data or defective components—are resolved at the electronic level. A final functional test ensures full operational readiness.

After being sent to Airbag24, the control unit undergoes a standardized process. First, the fault memory is read out and a systematic analysis of the circuit board is performed to pinpoint the exact source of the fault—whether it’s damage following an accident or an electronic malfunction.

In the second step, the actual repair takes place. Technicians erase the stored crash data, repair or replace faulty internal components, and fix any electronic defects. If a repair is not feasible, we offer replacement with a remanufactured unit.

Finally, each repaired control unit is subjected to a thorough functional test. Only after all tests have been successfully passed is the device cleared for return shipment. Of course, you receive a 12-month warranty on the repair.

What shipping options are available?

Airbag24 offers flexible, customer-friendly shipping options. You can either send your defective control unit yourself free of charge or arrange a convenient UPS pickup from your preferred location. For return shipments, you have access to free standard shipping, as well as express and cash-on-delivery options.

For outbound shipping, you have two choices: you can ship the package to us yourself, or use our convenient UPS pickup service, which collects the package directly from your home or workshop.

For return shipments, UPS standard shipping is completely free for you. If you need faster delivery, you can opt for UPS express shipping. Both options are also available as cash-on-delivery services. Alternatively, you can pick up the repaired control unit in person at our facility.