What is a Citroën Relay II airbag control unit?
The Citroën Relay II airbag control unit is the central safety unit in your vehicle, which activates all occupant restraint systems in the event of an accident. It continuously monitors sensors, stores relevant crash data, and ensures the proper deployment of all airbag modules and seatbelt pretensioners for maximum safety.
This essential module, also known as the airbag ECU, processes signals from acceleration sensors and crash sensors.
Its main task is to fire the airbags precisely and quickly in the event of an impact.
Why is the Citroën Relay II airbag control unit defective?
The Citroën Relay II airbag control unit often fails because internal electronic components wear out over time or are damaged by voltage fluctuations, particularly due to problems with the vehicle's battery. This then leads to communication errors in the airbag system and the persistent activation of the warning light on the dashboard.
A common reason is error code B0100, which indicates an internal defect.
Low supply voltage, often caused by a weak battery, can also affect the control unit.
Communication failures on the CAN bus are also causes that make repair of the control unit necessary.
Common error codes for Citroën Relay II airbag control unit repair
During a Citroën Relay II airbag control unit repair, we primarily diagnose code-specific errors that directly indicate problems with the airbag control unit itself, not with sensors or seatbelt pretensioners. These codes indicate internal defects, supply voltage issues, or communication problems within the system.
- B0100 → Internal electronic error in the airbag control unit → Wear or voltage peaks
- B0100-49 → Internal error in the airbag control unit → Often caused by battery or voltage problems
- B0101 → Supply voltage below threshold → Voltage at control unit too low
- U0019 → CAN bus communication error → interruption of the data connection to the control unit
- B0129 → Communication error in the airbag system → Fault in the connection to other modules
- B0136 → Control unit communication error → General control unit communication problems
- B0137 → Control unit communication error (additional diagnostic code) → Specific internal communication fault
What part numbers are available for Citroën Relay II airbag control unit repair?
For Citroën Relay II airbag control unit repairs, several verified OEM part numbers are relevant, ensuring exact compatibility with your vehicle. These numbers identify the original airbag control unit and are crucial for a successful repair or replacement, as they are specifically designed for your model.
Checking the exact original part number is crucial before any repair to ensure a perfect fit.
These numbers are also relevant for identical models such as the Fiat Ducato and Peugeot Boxer, which use the same system.
Always look for verified OEM numbers to avoid replacement errors.
- 01370978080 → Manufacturer: Citroën / PSA → Type: Original OEM for Citroën Relay II
- 1608428080 → Manufacturer: PSA (Citroën/Fiat) → Type: Original OEM, suitable for Relay II, Ducato, Boxer
- 01366119080 → Manufacturer: PSA → Type: Alternative Original OEM Number
- 01388160080 → Manufacturer: PSA (Citroën Jumper II) → Type: Original OEM for Jumper II (Type 250)
- 00046858203 → Manufacturer: PSA / Supplier → Type: Alternative OEM for Jumper III / Ducato III
- 1394332080 → Manufacturer: PSA / Supplier → Type: OE/OEM Reference Number
- 1681055580 → Manufacturer: PSA / Supplier → Type: Alternative OEM number with the same function
Your specialist for Citroën Relay II airbag control unit repair
We are your experienced partner for professional Citroën Relay II airbag control unit repairs. We offer comprehensive diagnostics and fix the most common defects quickly and reliably. Our service includes the elimination of error codes like B0100 and the restoration of full functionality, restoring your vehicle's safety.
Our workshop has the necessary know-how and specialized equipment to repair your broken airbag control unit.
By repairing instead of replacing the entire unit, you can save costs and protect the environment.
Contact us for a quick diagnosis and a free quote to get your airbag system fully functional again.