Airbag control unit with part number BK3T-14B321-BD

What does the airbag control unit BK3T-14B321-BD do?

As the central unit, the airbag control unit BK3T-14B321-BD controls the restraint system of Ford. It evaluates the sensors, determines in an accident which airbags and seatbelt pretensioners fire, and checks the system continuously.

If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident it stores crash data and then locks itself.

Why does the control unit BK3T-14B321-BD fail?

Stored crash data from an accident is the most common cause with the BK3T-14B321-BD, even if no airbag fired. An ordinary diagnostic tool cannot erase it. Further causes include aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data stays in memory until you have it specifically erased.

Electronics and contacts react sensitively to age, moisture and voltage spikes. Plug connections in particular are susceptible, because water and salt attack them.

How can you tell that the BK3T-14B321-BD is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently if the BK3T-14B321-BD has a fault. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Watch for these signs:

• 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.
• The fault memory cannot be cleared.

If you see the light, it concerns the restraint system as a whole and not a minor matter.

Which vehicles is the BK3T-14B321-BD fitted in?

The airbag control unit BK3T-14B321-BD is fitted in these vehicles: Ford Transit 7 ’14 (from 2014). The details apply to Ford.

The vehicle list for this unit:

• Ford Transit 7 ’14 (from 2014)

First, compare the part number on the label of the removed unit with this page. This only proves that the unit fits, not what the cause is. Then have the fault memory read out before removal, because only the log shows whether the control unit is faulty or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers BK2T-14B321-BF, BK3T-14B321-AC, DT1T-14B321-DF, KT1T-14B321-KD, LK4Z-14B321-C, LK4Z-14B321-E.

How does the repair of the BK3T-14B321-BD work?

First have the fault memory read out, enclose the log and disconnect the battery, then remove the control unit. Afterwards create a repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs faulty components, erases the crash data and carries out a function test.

Your own unit is then returned to you. 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 BK3T-14B321-BD get to Airbag24?

You send the control unit BK3T-14B321-BD in as a parcel or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Pack the unit shock-resistant and enclose the printed repair order.