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

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

The airbag control unit BM5T-14B321-BG coordinates the restraint system of Ford. In a crash it reads the crash sensors, decides within milliseconds which airbags and seatbelt pretensioners fire, and monitors the system constantly.

If the unit detects a fault, it switches on the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself; only a repair lifts this lock.

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

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture at plug connectors and voltage spikes.

Which of these causes applies in an individual case only becomes clear when the unit is examined. In overview, the following points come into consideration:

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

Airbag24 erases the crash data during the repair; the team checks the other points as part of the examination.

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

A defect shows up through the airbag warning light in the instrument cluster when it lights up. In addition there may be a fault message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may fail to deploy in the event of such a defect, so take the warning light seriously. Whether it burns constantly or only lights up at times is secondary for the examination.

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

The BM5T-14B321-BG is fitted in these vehicles: Ford Focus 3 ’11 (2010-2014) and 3 ’11 Facelift (2014-2018). Compare your car with this selection before you remove the control unit.

This assignment is based on the information we hold for this part number. The following vehicles are listed in it:

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

Comparing the part number on the label with this page only shows that you have the correct unit in front of you. Please also have the fault memory read out in advance, because only this result reveals whether the control unit is defective or 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-BG work?

Start by having the fault memory read out and include the log. Then disconnect the battery and only afterwards remove the control unit. Finally, create a repair order online and send the unit in well packed.

Airbag24 examines the unit you send on the test bench, repairs defective components and carries out a function test. Stored crash data is erased in the process, after which your own unit is sent back to you.

Processing at Airbag24 usually takes 3–4 working days. 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-BG get to Airbag24?

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

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