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

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

The BK3T-14B321-BB is the central control unit of the restraint system (SRS) for Ford. It processes the signals of the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During normal driving it monitors the system, and it reports faults via the airbag warning light.

In an accident the unit stores crash data and then locks itself.

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

The most common cause on the BK3T-14B321-BB is stored crash data, even if no airbag has deployed. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

Voltage spikes occur, for example, with a weak battery or a jump start, and place additional stress on the electronics.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently when the BK3T-14B321-BB is defective. An error message appears in the instrument cluster at the same time, and the fault memory cannot be cleared.

The diagnostic tool also gets no connection to the control unit. This too shows that something in the system is wrong.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

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

The BK3T-14B321-BB is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

The list below shows the vehicles recorded for this unit.

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page, so that you have the right unit. Also have the fault memory read out, because only that result shows 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 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-BB work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only after that remove the BK3T-14B321-BB. Next, create a repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench, replaces defective components if needed, erases the stored crash data and carries out a function test. Processing there usually takes 3–4 working days. The unit then goes back 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-BB get to Airbag24?

You send the control unit BK3T-14B321-BB as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

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