Airbag control unit with part number 95640

What is the function of Airbag Control Unit 95640?

The airbag control unit with part number 95640, often also identified as 5WK44988-95640, is the central control unit for the vehicle’s passive safety systems. It processes signals from crash sensors, deploys airbags and seatbelt pretensioners in the event of a collision, and stores relevant crash data.

The unit continuously monitors all components of the restraint system, including sensors, airbag modules, and seatbelt pretensioners. In the event of a collision, it determines within milliseconds which safety devices need to be activated to provide optimal protection for occupants.

A critical function is storing crash events in its internal memory. After an accident, this data causes a deliberate lockout of the control unit, preventing further use and necessitating repair or replacement.

Why does Airbag Control Unit 95640 fail?

The most common cause of failure for control unit 95640 is the storage of crash data after an accident. This data locks the unit software‑wise, preventing a system restart. Other potential defects include hardware issues such as cold solder joints, damaged memory chips, or faulty sensor connections.

Following a crash in which airbags have deployed, the sensors send a corresponding signal to the control unit. The unit permanently stores this event in its internal memory, triggering an intentional lockout. The system then reports an internal error, and the airbag warning light illuminates.

Although software‑based locking is the primary cause, physical damage can also occur. Cold solder joints on critical components or a defective memory chip may lead to total failure or sporadic malfunctions. In such cases, a purely software‑based repair is not always sufficient.

How do you recognize a defect in Control Unit 95640?

A defective Airbag Control Unit 95640 is primarily indicated by the airbag warning light (SRS light) remaining steadily illuminated or flashing on the instrument panel. This signal alerts to a fault in the restraint system and warns that airbags and seatbelt pretensioners might not deploy in the event of another collision.

Normally, the airbag light illuminates briefly upon ignition and then turns off. If the light stays on, it indicates an active fault stored in the vehicle’s diagnostic memory.

Another symptom may be a loss of communication with the control unit. During diagnostics via the OBD interface, the unit may become unresponsive, or specific error codes may appear, pointing to an internal defect in the control unit.

In which vehicles is Control Unit 95640 installed?

Airbag Control Unit 95640 can be found in various models from Citroën, Daihatsu, Hyundai, Mitsubishi, and Nissan. These include, among others, the first‑generation Citroën DS4, the Mitsubishi RVR, and the Nissan Serena C26, highlighting the versatility of this component.

At Airbag24, we repair part number 95640, which is used in the following models and series:

Citroën: DS4 I (model years 2011–2015) and the facelift model (2015–2018)

Daihatsu: Tanto Exe L465

Hyundai: Grand i10 HB

Mitsubishi: RVR N10 and RVR N20

Nissan: Serena C26 (model years 2010–2016)

How is Airbag Control Unit 95640 professionally repaired?

Professional repair focuses on resetting the software to factory settings. Stored crash data is erased from the internal memory chip using specialized programming tools. Following this reset, the control unit becomes fully functional again, and the airbag warning light goes out after installation.

After sending the removed control unit to Airbag24, the repair follows a proven process. Removal typically takes place inside the vehicle, under the rear seat or in the footwell.

The core of the repair is the software reset. Technicians read the control unit’s memory chip, modify the data file to remove crash records, and write the cleaned file back. Care is taken not to clone any data, thus avoiding the transmission of potential errors.

Upon successful repair and a final functionality check, the unit is returned. After reinstallation in the vehicle and clearing the fault memory, the safety system is restored to full working order. We offer a 12‑month warranty on all repairs.

What are the benefits of repairing control unit 95640?

The key advantage of repair is substantial cost savings—up to 90% compared to a new part, which can cost as much as €750. Additionally, you retain the original, vehicle‑specific control unit, potentially eliminating the need for time‑consuming re‑coding.

While a new control unit often comes with high costs and potential supply chain delays, repair offers an economical and efficient solution. The unit is restored to its original factory condition and is fully operational once again.

Repair also represents a sustainable alternative, extending the lifespan of existing electronic components and helping to reduce e‑waste. With a 12‑month warranty, refurbishment provides a safe and reliable option for workshops and vehicle owners.

What shipping options does Airbag24 offer?

Airbag24 provides flexible and secure shipping solutions. For sending your unit to us, you can either return it yourself at no charge or arrange a convenient UPS pickup from your preferred location. For returning the repaired unit, we offer both free standard UPS shipping and a faster UPS Express service.

To ship your defective control unit to us, you have two simple options: send the package yourself or use our UPS pickup service directly at your location.

After repair, you can choose from several return‑shipping methods. Standard UPS shipping is free of charge. For urgent cases, we provide UPS Express delivery. Both options are also available with cash on delivery. Alternatively, you can pick up the repaired control unit in person at our facility.