What is a Citroën C5 III airbag control unit?
The Citroën C5 III airbag control unit is the central electronic unit responsible for occupant safety in the event of a collision. It continuously monitors sensor data, decides on the activation of airbags and seatbelt pretensioners, and stores important crash information for diagnosis and repair.
This safety-relevant component controls the vehicle's entire passive safety system. It receives signals from crash sensors that precisely measure acceleration and impact forces.
Proper functioning of the control unit is essential for effectively protecting occupants in the event of an accident. It ensures the coordinated deployment of all relevant restraint systems.
Why is the Citroën C5 III airbag control unit defective?
A Citroën C5 III airbag control unit can malfunction due to internal electrical faults or communication problems, often caused by stored crash data after an accident. These malfunctions lead to airbag system failure and require professional diagnosis and repair or replacement of the unit.
Internal electrical faults, such as those indicated by codes B0100 or B0200, are a common cause of failure. These defects impair the core functions of the control unit.
A vehicle crash results in irreversible data being stored in the control unit, causing it to become disabled. Deleting this crash data is essential for reuse.
Communication errors, such as those indicated by code B1000, can also paralyze the control unit. This affects the connection to other systems in the vehicle.
The airbag control unit can also be damaged by overvoltage or water ingress. Such environmental influences endanger the component's electronics.
Common error codes for Citroën C5 III airbag control unit repair
During a Citroën C5 III airbag control unit repair, specific error codes are often read out, indicating internal defects, communication problems, or stored crash data. These codes are crucial for a precise diagnosis and identifying the necessary control unit repair measures.
- B0100 → Internal electrical error in the control unit → Defect in the internal circuits of the airbag control unit.
- B0200 → Internal error in the airbag control unit → General malfunction of the ECU software or hardware.
- B1000 → Control unit communication error → Interruption of the data connection between the airbag control unit and other vehicle systems.
- 226 → Airbag control unit faulty (Citroën specific) → Direct indication of a defect or malfunction in the airbag control unit.
- 06F → Passenger airbag deactivated (ECU specific) → Status or error related to the deactivation of the passenger airbag, controlled by the ECU.
These error codes are essential for troubleshooting if you want to repair your Citroën C5 III airbag control unit. These errors often need to be cleared after a repair.
What part numbers are available for the Citroën C5 III airbag control unit repair?
Several verified OEM part numbers are available for Citroën C5 III airbag control unit repairs, ensuring compatibility with your vehicle model. These genuine parts guarantee the proper functioning of the safety system and are crucial for a successful repair.
When repairing or replacing a defective control unit, the correct OEM part numbers are crucial. These numbers ensure a perfect fit for your Citroën C5 III model.
The following original part numbers for the airbag control unit of the Citroën C5 III have been verified and documented multiple times:
6546X2 (Citroën Original) – A commonly found part number for the airbag control unit.
9665558180 (Citroën Original) – This number is listed on various spare parts catalog pages.
9641968380 (Citroën Original) – Confirmed for sedan and estate variants of the C5 III.
9674290580 (Citroën Original used) – Also available as a tested used part for the airbag control.
9648665580 (Citroën Original) – Confirmed OEM number with specific fit to the C5 III.
When repairing your Citroën C5 III airbag control unit, always ensure the part number matches exactly. This prevents compatibility issues after installation.