Airbag control unit with part number BM5T-14B321-BF

What does the airbag control unit BM5T-14B321-BF do?

In the restraint system (SRS) of Ford, the airbag control unit BM5T-14B321-BF is the central unit. It evaluates the signals from the crash sensors, selects airbags and seatbelt pretensioners for triggering in an accident, and monitors the system continuously.

The warning for faults appears via the airbag warning light. After an accident the unit stores crash data and locks itself.

The unit is permanently installed in the vehicle and works without any operation.

Why does the control unit BM5T-14B321-BF fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool does not erase it; during the repair of the control unit BM5T-14B321-BF, Airbag24 removes it.

Besides that, the following causes come into consideration:

• aged electronic components
• cold solder joints on the circuit board
• moisture or corrosion at plug connections
• voltage spikes, for example with a weak battery or after a jump start

These influences act over the entire service life of the unit.

How can you tell that the BM5T-14B321-BF is defective?

The airbag warning light in the instrument cluster indicates the defect as soon as it lights up constantly or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit BM5T-14B321-BF, and the fault memory cannot be cleared.

The warning light is the most important warning signal in the vehicle.

In an emergency, airbags and seatbelt pretensioners may fail to trigger with a faulty control unit.

Which vehicles is the BM5T-14B321-BF fitted in?

The details in the list help you compare. The control unit BM5T-14B321-BF is fitted in these vehicles: Ford Focus 3 ’11 (2010-2014) and 3 ’11 Facelift (2014-2018).

The following list shows the vehicles that belong to this control unit:

• Ford Focus 3 ’11 (2010-2014)
• Ford Focus 3 ’11 Facelift (2014-2018)

Comparing the part number on the removed unit with this page only ensures that you have the right unit. Before removal, also have the fault memory read out, because only the result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285011993, BM5T-14B321-CE, CM5T-14B321-CA, DM5T 14B321 SA, F1ET-14B321-CB.

How does the repair of the BM5T-14B321-BF work?

The process begins with the read-out of the fault memory, whose log accompanies the package, followed by disconnecting the battery and only then removing the control unit BM5T-14B321-BF. Finally, create the repair order online and send the carefully packed unit. Processing at Airbag24 usually takes 3–4 working days.

On the test bench at Airbag24, defective components are replaced, crash data is erased and a function test is run. Afterwards your own unit goes back to you.

This sequence serves safety and must be observed.

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 BM5T-14B321-BF get to Airbag24?

You send the control unit BM5T-14B321-BF as a parcel, or you book UPS collection for an extra charge. After the repair Airbag24 sends the control unit BM5T-14B321-BF back by UPS.

The unit must be packed shockproof, and the repair order must be included in printed form in the parcel.