What is a Ford Fiesta Mk2 airbag control unit?
The Ford Fiesta Mk2 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It monitors sensors, stores crash data, and ensures the proper functioning of all airbag modules in the vehicle.
This electronic module, also known as the Restraint Control Module (RCM), is responsible for the precise control of airbag deployment in the Ford Fiesta Mk2. It constantly evaluates signals from crash and G-sensors.
In the event of a collision, the control unit decides within milliseconds which airbags need to be activated with a firing pulse to protect the occupants. It is a critical component for vehicle safety.
Why is the Ford Fiesta Mk2 airbag control unit faulty?
A Ford Fiesta Mk2 airbag control unit may be faulty because it is storing crash data that requires a reset, is internally damaged (e.g. due to water ingress or overvoltage), or has communication problems with other vehicle systems that require repair or replacement.
A defect in the airbag control unit is often due to a full crash data memory after an impact has been registered. This memory must be professionally reset for further use.
Internal errors or damaged hardware due to aging, moisture, or extreme temperatures can also lead to failure. This often manifests itself in a permanently illuminated airbag warning light.
Electrical problems, such as short circuits in the warning light circuits or communication problems with other control units, can impair function. An accurate diagnosis is essential for a successful Ford Fiesta Mk2 airbag control unit repair.
Common error codes for Ford Fiesta Mk2 airbag control unit repair
When repairing the Ford Fiesta Mk2 airbag control unit, specific error codes are crucial to diagnosing the cause of a malfunction and taking targeted measures that affect only the control unit itself.
- B1000 → Control unit communication error → Internal fault or problem with the data connection.
- B1231 → Crash data log full (longitudinal G acceleration exceeded) → Accident event was saved, requires reset.
- B1342 → Airbag control unit defective → Hardware or software error in the module itself.
- B1869 → Airbag warning lamp open or short to ground → Problem in the warning lamp circuit.
- B1870 → Airbag warning light short circuit battery → Electrical short circuit in the power supply of the warning light.
- B2477 → Airbag control unit configuration error → Module is incorrectly programmed or requires adjustment.
- U3000 → Control unit error / general airbag ECU error → Internal system error of the airbag control unit.
- U2017 → Communication error between control units → Problem with data transmission to other vehicle modules.
What part numbers are available for the Ford Fiesta Mk2 airbag control unit repair?
For a successful Ford Fiesta Mk2 airbag control unit repair or replacement, it is essential to identify the exact OEM part number as this ensures compatibility and correct function in the vehicle.
- N1BT-14B321-HA → Ford OE → Original part
- C1BT-14B321-FE → Ford → Genuine part
- YS6T-14B056-BD → Bosch/Ford → Original part
- 2S6T-14B056-EN → Ford → Genuine part
- 5S6T-14B056-JA → Ford → Original part
- AE8314B321AH → Ford → Replacement/Original tested
- 6S6T15K600BE → Ford → Original part