Airbag control unit with part number 9664058780

What is the Airbag Control Unit 9664058780?

The airbag control unit with part number 9664058780 is the central control module for the occupant restraint system (SRS) in vehicles such as the Peugeot 408 II. It processes data from acceleration sensors to ensure precise and timely deployment of airbags and seatbelt pretensioners in the event of a crash.

As an SRS ECU (Supplemental Restraint System – Electronic Control Unit), it continuously monitors all components connected to the restraint system, including front, side, and head airbags, seatbelt pretensioners, seat occupancy detection, and associated crash sensors.

This control unit is also responsible for diagnosing the system. It constantly checks the functionality of all circuits and, upon detecting a problem—such as a faulty igniter or an internal defect—activates a warning via the airbag warning light on the instrument cluster.

Why Does the 9664058780 Control Unit Fail?

Failures of the 9664058780 control unit are often due to two main causes: stored and locked crash data following an accident, or internal hardware defects on the circuit board. Frequently, aging electronic components, cold solder joints, or damaged memory chips lead to malfunctions.

After an airbag deployment, the unit permanently stores so‑called crash data. This storage is a manufacturer‑imposed safety measure that locks the control unit, preventing reuse without proper repair. In such cases, the airbag warning light remains illuminated.

Even without an accident, purely electronic faults can occur. Common causes include defective voltage regulators, damaged driver ICs for communication, or errors in the memory IC (EEPROM). Such defects often result in internal error codes like B1000 (“internal control unit fault”).

This control unit is technically identical to other reference numbers. Therefore, issues and repair methods apply equally to part numbers 9800099380, 620260800, 95320, and 9654717280, which are mutually interchangeable.

How Do You Recognize a Fault in the 9664058780?

A fault in the airbag control unit 9664058780 primarily manifests as a permanently illuminated airbag or SRS warning light on the dashboard. Additionally, the control unit may become unresponsive when connected to a diagnostic tool, or specific, non‑erasable error codes such as B1000 (internal fault) may be logged.

The most noticeable sign is the persistently lit airbag warning light. It does not turn off after starting the vehicle, indicating a serious, safety‑relevant system failure that requires immediate inspection.

Another red flag is complete loss of communication. The workshop cannot establish a connection between the diagnostic tool and the airbag control unit, making fault analysis impossible. The unit appears “dead.”

If error codes such as the manufacturer‑specific code B1000 (“internal control unit fault”) are read, this directly points to a defect within the control unit itself. Subsequent errors in the airbag or seatbelt pretensioner ignition circuits may also originate in the control electronics.

In Which Vehicles Is the 9664058780 Installed?

The airbag control unit with part number 9664058780 is mainly used in vehicles manufactured by Peugeot. At Airbag24, we specialize in repairing this specific control unit and its compatible variants, particularly for the second‑generation Peugeot 408 (from model year 2014 onward).

At Airbag24, we offer professional repair services for this control unit on the following model:

Peugeot 408 II (2014–present)

Repairing here is especially cost‑effective, as it avoids the expensive purchase of a new unit and any potential adaptation required at an authorized service center.

How Does Airbag24 Repair the 9664058780?

At Airbag24, repairs to the 9664058780 control unit follow a standardized, professional process. Upon receipt, the unit is analyzed on a test bench, crash data is erased, and defective electronic components on the circuit board are replaced. Final functional tests ensure full operability.

Once the control unit arrives at Airbag24, our technicians conduct a thorough incoming inspection. They read out the fault memory and verify whether communication with the device is possible, thereby identifying the exact cause of the issue—whether it’s solely crash data or an additional hardware defect.

Repairs are performed at the component level. Depending on the nature of the fault, defective SMD components such as voltage regulators or memory chips are replaced, and solder joints are reworked. For units containing crash data, the memory contents (EEPROM/Flash) are read out, and only the crash entry is removed, while all vehicle‑specific data remain intact.

After repair, the control unit is retested on a specialized test bench to ensure proper functionality of all deployment channels and flawless communication. You receive a fully functional component that performs like new, complete with 2 years’ statutory liability for defects on the repair performed.