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

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

The airbag control unit C1BT-14B321-FH controls the restraint system (SRS) for Ford. In a crash it evaluates the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered. It constantly monitors the state of the system and shows faults via the airbag warning light.

While driving, the control unit compares the signals of the components with stored target values. Every deviation is recorded in the fault memory.

After an accident it secures crash data and locks itself. This process takes place inside the control unit, even if the vehicle looks undamaged from the outside.

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

Most often the cause is crash data that remained in the memory after an accident, even when no airbag was triggered. A normal diagnostic tool does not erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes from a weak battery or jump-starting.

Crash data is one reason a unit can become conspicuous even on an undamaged vehicle. A diagnostic tool can access it, but not in a way that would allow it to be removed.

The other causes tend to develop slowly. Electronic components age over time, solder joints give way under temperature changes, and moisture or corrosion weakens the contact at plug connectors.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

• The airbag warning light lights up permanently or intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

The light indicates a detected fault in the system, even if it goes out again in between. Please take this warning seriously.

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

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

The following list shows the vehicles that Airbag24 assigns to this part number.

• Ford Fiesta 7 ’09 (2008-2017)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Have the fault memory read out beforehand, because only that result shows whether the control unit is defective or whether a plug or a 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-FH work?

Have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send in the unit. At Airbag24 processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. The unit then goes back to you.

These steps take priority because they protect your safety. The 3–4 working days apply only to the work at Airbag24.

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-FH get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.