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

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

The airbag control unit BC24-14B321-BC coordinates the restraint system (SRS) of Ford. It reads the crash sensors, decides in an emergency within milliseconds which airbags and seatbelt pretensioners to trigger, and reports faults to the airbag warning light.

During operation, the electronics constantly monitor the connected components. If they detect a deviation, it is stored as a fault in the memory.

After an accident, the unit writes crash data and locks itself. Only the repair lifts the lock.

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

The most common cause is crash data from an earlier accident, even if no airbag was triggered. A normal diagnostic tool cannot access this data and cannot erase it. Other causes are aged electronic components, cold solder joints, moisture or corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The problem lies in the memory: the crash data remains there even if no damage is visible from the outside. The remaining causes are difficult to judge from the outside.

That is why only the check on the test bench brings clarity. Airbag24 erases the crash data during the repair and establishes which of the remaining causes is actually present.

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

A fault announces itself through the airbag warning light in the instrument cluster, which stays on permanently or only at times. A fault message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared are also conspicuous.

The diagnostic tool then cannot make contact with the control unit, and the fault memory remains despite attempts to clear it. Both point to the system having detected a fault.

In this case, airbags and seatbelt pretensioners may fail to deploy in an emergency. The warning light is therefore a clear reason to have the system checked promptly.

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

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

The list below shows the vehicles stored for this part number.

• Ford E-Series 4 (2008-2020)

Before you send the unit in, compare the part number on the label with this page. This tells you that it is the right unit, but nothing yet about its condition. So have the fault memory read out, because only the result shows whether the control unit or a plug or cable is the cause.

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

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

First have the fault memory read out and enclose the report. Then disconnect the battery, and only after that is the control unit removed. Next, create the repair order online and pack the unit well before you send it.

This sequence is prescribed for your safety. Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days. This period covers only checking, repairing and testing at Airbag24. Afterwards, your own unit 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 BC24-14B321-BC get to Airbag24?

You send the unit to Airbag24 as a parcel or, for an extra charge, book a UPS collection. After the repair, Airbag24 returns your own unit by UPS.

Place the printed repair order in the parcel and pack the control unit shock-proof.