Airbag control unit with part number AC24-14B321-BA

What does the airbag control unit AC24-14B321-BA do?

The airbag control unit AC24-14B321-BA manages the restraint system (SRS) in Ford. It evaluates the crash sensors, determines the triggering of airbags and seatbelt pretensioners and monitors the system continuously. Faults are reported via the airbag warning light.

The unit has a fault memory in which irregularities are stored as soon as the system notices them.

After an accident, the control unit stores crash data and locks itself. Repair is the only way to lift this lock.

Why does the control unit AC24-14B321-BA fail?

The most common cause is crash data stored after an accident, even without a triggered airbag, and these cannot be cleared with a standard diagnostic tool. Other causes are ageing of the components, connection problems caused by moisture and corrosion, and voltage spikes.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

Crash data do not necessarily mean that the electronics have failed, but they prevent the fault from being cleared.

The causes listed cannot be told apart from the outside, which is why reading out the fault memory is the next step.

How can you tell that the AC24-14B321-BA is defective?

Signs include an airbag warning light that stays on permanently or intermittently, and fault messages in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may not deploy.

• Airbag warning light permanently or intermittently active
• Fault message in the instrument cluster
• Diagnostic tool does not connect to the control unit
• Fault memory cannot be cleared

Do not wait if such signs appear; have the system checked. A warning light is the signal that the system has itself detected a fault.

Which vehicles is the AC24-14B321-BA fitted in?

The airbag control unit AC24-14B321-BA is fitted in these vehicles: Ford E-Series 4 (2008-2020).

The vehicles with this unit are named below:

• Ford E-Series 4 (2008-2020)

Compare the part number on the removed unit with this page; that only confirms that you have the matching unit. Have the fault memory read out beforehand, because only the result shows whether the control unit is defective or whether 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, BC24-14B321-AB, BC24-14B321-AC, BC24-14B321-AD, BC24-14B321-BB.

How does the repair of the AC24-14B321-BA work?

You have the fault memory read out and enclose the log. Then you disconnect the battery and remove the control unit. Next, create a repair order online and pack the unit well for shipping.

Airbag24 examines the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. The unit then returns 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 AC24-14B321-BA get to Airbag24?

You send the unit as a parcel or arrange a UPS collection for an extra charge. Airbag24 sends the repaired unit back by UPS as well.

The printed repair order goes into the parcel, along with the shockproof packaging of the control unit.