Airbag control unit with part number 9664217980

What is the function of Airbag Control Unit 9664217980?

The part number 9664217980 refers to an original airbag control unit (OEM) from Citroën/PSA, often supplied by Autoliv. Its core function is to monitor the vehicle’s entire restraint system. It processes data from crash sensors and, in the event of a collision, precisely deploys the airbags and seatbelt pretensioners.

As the central control unit, this device is essential for passive safety in models such as the Citroën C4. It continuously collects information from acceleration and pressure sensors, enabling it to respond to a collision within milliseconds.

Its precise calibration as an original part ensures seamless communication with all other vehicle components. Variants of this control unit are often identified by additional suffixes like AJ or the number 606474700, but they functionally represent the same assembly.

Why does Control Unit 9664217980 fail?

The most common causes of failure for Control Unit 9664217980 are internal in nature. These primarily include electronic faults on the circuit board, such as defective capacitors or memory damage. Another typical cause is the storage of crash data after an accident, which triggers a safety lock on the unit.

A primary defect involves hardware issues inside the device. Aging processes or thermal stress can lead to damage in electronic components like capacitors or memory chips, often resulting in total failure or persistent error messages.

Following an accident—even minor collisions—the control unit irrevocably writes crash data into its memory. This safety feature locks the unit to prevent erroneous deployment in the future. The system remains disabled until professional repair and deletion of these data.

How do you recognize a fault in Control Unit 9664217980?

A fault in Control Unit 9664217980 almost invariably manifests as a permanently illuminated airbag warning light on the dashboard. This warning indicates a critical error in the restraint system and should be checked immediately, as the protective function is no longer guaranteed.

The most noticeable symptom is the persistently lit airbag warning light. It does not turn off after starting the engine, signaling that the control unit has detected an internal or system-wide fault and would not deploy the airbags in an emergency.

In workshops, the fault may also become apparent when communication with the control unit via a diagnostic tool becomes impossible. The unit fails to respond to queries, preventing both reading and clearing of error codes.

In which vehicles is Control Unit 9664217980 installed?

The airbag control unit with part number 9664217980 is a specific component for PSA Group vehicles and is predominantly used across various generations of the Citroën C4. At Airbag24, we offer expert repair services for this control unit in all compatible models.

At Airbag24, we repair Control Unit 9664217980 for the following Citroën models:

Citroën C4 I (model years 2004–2008) and its facelift (2008–2010), Citroën C4 III (from 2020), Citroën C4 Picasso I (2006–2010) and its facelift (2010–2013), Citroën C4 Grand Picasso I (2006–2010) and its facelift (2010–2013), Citroën Grand C4 Picasso I, as well as Citroën C4 Grand Picasso II (2013–2022).

The compatibility of this part number with the aforementioned models has been repeatedly confirmed by PSA manufacturer specifications, supplier data from Autoliv, and extensive repair experience.

How is Control Unit 9664217980 repaired?

Professional repair at Airbag24 is a proven, cost-effective solution. After submitting the removed unit, a detailed fault analysis is performed. Subsequently, crash data are erased, defective components replaced, and the unit reprogrammed. Each repair concludes with a functional test and includes 2 years' statutory liability for defects.

The process begins with you or your workshop removing the faulty control unit. You then pack it securely for transport and send it to us along with the completed repair form. Prior registration is not required.

Upon receipt at Airbag24, our technicians open the control unit and conduct a comprehensive diagnosis. The focus is on addressing the root cause—whether erasing the airbag lock after an accident or replacing defective electronic components on the circuit board.

Finally, the repaired unit undergoes a thorough functional test on a test bench. Once successfully tested, it is promptly returned to you. All repairs come with 2 years' statutory liability for defects.