Airbag control unit with part number A2C97998006

What is the function of the A2C97998006 airbag control unit?

The A2C97998006 airbag control unit from Bosch is the central control module for the passive safety system (SRS) in the Nissan Micra K14. It processes data from crash sensors in real time and determines whether to deploy airbags and seatbelt pretensioners, ensuring optimal occupant protection during a collision.

As an OEM component, this control unit is deeply integrated into the vehicle’s electronic systems of the Nissan Micra K14. Its primary task is to monitor the entire Supplemental Restraint System (SRS). It continuously communicates with acceleration and pressure sensors distributed throughout the vehicle.

In the event of a crash, the electronics analyze incoming signals and, upon exceeding predefined thresholds, trigger the corresponding pyrotechnic charges of the airbags and seatbelt pretensioners. At the same time, it records relevant crash data—known as “crash data”—for later analysis.

Why does the A2C97998006 airbag control unit fail?

The most common cause of failure for the A2C97998006 control unit is the retention of crash data after an accident. Other defects arise from internal hardware malfunctions in electronic components, water damage due to moisture ingress, or overvoltage in the vehicle’s electrical system.

Following a collision—even minor ones—the control unit locks itself for safety reasons. The stored crash data cannot be erased using standard diagnostic tools. This deliberate feature necessitates professional inspection and repair.

Internal hardware failures are another frequent cause. Defects in SMD components such as capacitors, resistors, or internal circuitry can lead to malfunctions. Such damage may result from aging or external factors like moisture or voltage fluctuations.

How do you recognize a fault in the A2C97998006?

A defective A2C97998006 airbag control unit primarily manifests as a permanently illuminated or flashing airbag warning light (SRS indicator) on the instrument cluster. Often, communication between the diagnostic tool and the control unit breaks down, resulting in specific error codes such as B1059.

The most noticeable symptom is the active SRS warning light, indicating that the system has detected an internal fault and can no longer reliably deploy airbags or seatbelt pretensioners in an emergency. In this state, the vehicle is not roadworthy.

Another clear sign is the loss of communication during diagnostics. If a workshop attempts to read the fault memory via the OBD2 interface, the control unit fails to respond, pointing to a serious internal defect.

The fault memory often contains specific error codes directly related to the control unit. For Nissan vehicles, these include code B1059, which indicates an internal, non-erasable ECU fault, and code B1129, signaling a malfunction in the ignition circuit.

In which vehicles is the A2C97998006 installed?

The airbag control unit with part number A2C97998006 was specifically developed by Bosch for use in a particular vehicle series. It is mainly found in Nissan models, especially within the compact car segment from the late 2010s through the early 2020s.

At Airbag24, we repair the A2C97998006 part number for the following model:

Nissan: Micra K14 (model years 2017–2022)

For precise compatibility verification, it is advisable to check the part number directly on the removed control unit and compare it with the one listed here.

How is the A2C97998006 professionally repaired?

At Airbag24, the A2C97998006 control unit undergoes a standardized repair process. Following an initial inspection and fault memory readout, crash data is cleared, and defective electronic components are replaced. A final functional test ensures quality, backed by 2 years' statutory liability for defects.

After sending the removed unit to Airbag24, a comprehensive diagnosis begins. Technicians extract the internal fault memory and determine whether crash data remains or if there is a hardware defect.

This is followed by actual restoration. Stored crash data is completely and securely erased at the chip level. If electronic damage is present, faulty SMD components such as capacitors or processors are expertly replaced.

Finally, the control unit is tested on a specialized test bench, simulating all functions to confirm flawless communication and deployment capability. Only after passing this test is the unit approved for return shipment. We provide 2 years' statutory liability for defects on every repair.