Airbag control unit with part number C1BT-14B321-BD

What does the airbag control unit C1BT-14B321-BD do?

The airbag control unit C1BT-14B321-BD is the central control unit for the restraint system (SRS) of Ford. It evaluates the signals from the impact sensors, determines in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults appear via the airbag warning light.

While driving, the control unit constantly checks whether the system is ready for operation. To do so, it monitors, among other things, the power supply and the connections to the sensors.

After an accident, the unit secures crash data and locks itself.

Why does the control unit C1BT-14B321-BD fail?

The most common cause is stored crash data after an accident, even where no airbag has fired; a normal diagnostic tool cannot remove it. Ageing components, cold solder joints, moisture and corrosion, and voltage spikes are also suspected.

The crash data is held in the memory of the control unit, even when nothing visible can be seen on the vehicle.

Further causes at a glance:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump starting

How can you tell that the C1BT-14B321-BD is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or only intermittently, and through a fault message there. In addition, the diagnostic tool does not establish a connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Several of these signs at once are a clear reason to have the system checked. Only the evaluation of the fault memory shows whether the control unit is really defective.

Even if the vehicle seems normal in everyday use, the warning remains a warning signal. Take it seriously and have it clarified promptly.

Which vehicles is the C1BT-14B321-BD fitted in?

The airbag control unit C1BT-14B321-BD is fitted in these vehicles: Ford Fiesta 7 ’09 (2008-2017).

Below you will find the vehicles that are known to us from the data on this control unit.

• Ford Fiesta 7 ’09 (2008-2017)

Before removing the unit, compare the part number on the label with this page so that you have the right unit in front of you. Then have the fault memory read out, because that alone shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers C1BT-14B321-CF, H1BT-14B321-AH, H1BT-14B321-AJ.

How does the repair of the C1BT-14B321-BD work?

First read out the fault memory and attach the log to the unit. Only then disconnect the battery and remove the control unit. Next, create a repair order online and send the unit in well packed. Airbag24 checks, repairs and tests the unit.

The sequence serves your safety. Keep to it precisely, even if the removal seems quick.

At Airbag24, the unit is checked, defective components are replaced, the crash data is erased and a functional test is carried out. Processing usually takes 3–4 working days. Afterwards your own unit is returned.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit C1BT-14B321-BD get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS. A printed repair order goes into the parcel, and the control unit is packed shock-proof.

Enough filling material prevents the control unit from sliding around inside the box.