Airbag control unit with part number BC24-14B321-AB

What does the airbag control unit BC24-14B321-AB do?

The airbag control unit BC24-14B321-AB controls the restraint system (SRS) of Ford. The crash sensors report their readings to the unit, which determines within milliseconds which airbags and seatbelt pretensioners fire in an accident. After a crash, it stores crash data and locks itself.

Outside an accident, the control unit continuously checks the wiring, sensors and actuators. If it detects a deviation, it switches on the airbag warning light and stores the fault in memory.

In everyday use the unit hardly stands out. Nevertheless, it contains all the logic that decides, in an emergency, whether the airbags fire or not.

Why does the control unit BC24-14B321-AB fail?

With BC24-14B321-AB, the most common cause is that crash data were stored after an accident, even if no airbag fired; a normal diagnostic tool cannot erase them. Other causes include aged electronic components, cold solder joints, moisture at plug connections and voltage spikes.

Airbag24 removes the crash data during the repair. The other causes concern the electronics themselves: solder joints on the circuit board can give way over time, and components age.

Moisture and corrosion at the connectors disrupt signal transmission. Voltage spikes arise, for example, from a weak battery or from jump-starting.

How can you tell that the BC24-14B321-AB is defective?

On the BC24-14B321-AB, a defect shows up as the airbag warning light in the instrument cluster flickering or staying on constantly or intermittently, and as a fault message in the instrument cluster. In addition, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

In such cases, airbags and seatbelt pretensioners may not deploy in an emergency. The warning is a clear signal, not a fluctuation that resolves itself.

• warning light that is on or flickering
• message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory that cannot be cleared

Which vehicles is the BC24-14B321-AB fitted in?

The control unit BC24-14B321-AB is fitted in these vehicles: Ford E-Series 4 (2008-2020).

Whether a unit fits your own car is decided by the model series and equipment, even when make and model match.

The assignment is shown here:

• Ford E-Series 4 (2008-2020)

A comparison of the part number on the label of the removed unit with this page shows whether it is the right unit. It does not establish the cause, however. Only a read-out fault memory shows whether the control unit is defective or a plug or cable is behind the fault. So have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 8C2Z-14B321-A, 9C24-14B321-BJ, AC24-14B321-BA, BC24-14B321-AC, BC24-14B321-AD, BC24-14B321-BB.

How does the repair of the BC24-14B321-AB work?

First have the fault memory read out; then disconnect the battery and only then remove the control unit BC24-14B321-AB. Next, create a repair order online, enclose the protocol and pack the unit well. For testing, repair and checking at Airbag24, you should generally allow 3–4 working days.

Airbag24 tests the unit on the test bench, replaces defective components and erases the crash data. A function test follows, and then your own unit is sent back to you.

The order of steps is binding for safety reasons. 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 BC24-14B321-AB get to Airbag24?

You arrange the shipping yourself by parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Put the printed repair order into the parcel. Make sure the packaging is shock-proof, so that the control unit takes no damage in transit.