Airbag control unit with part number AA6T-14B321-CA

What does the airbag control unit AA6T-14B321-CA do?

The unit is the control unit of the restraint system (SRS) in vehicles from Ford. It evaluates the signals from the crash sensors and determines in an accident which airbags and seatbelt pretensioners are triggered.

The evaluation takes place within milliseconds. The control unit also monitors the entire system continuously, and faults are shown via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and then locks itself. This data is central to every fault search.

Why does the control unit AA6T-14B321-CA fail?

Most often the cause is crash data from an earlier accident, even if no airbag was triggered. A normal diagnostic tool cannot delete this data.

Airbag24 deletes crash data during the repair. This point is thus settled when the unit is returned.

In addition, more general influences play a role: age-related changes to components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes, for example from a weak battery or a jump start.

How can you tell that the AA6T-14B321-CA is defective?

A defect can be recognised by the airbag warning light, which stays on permanently or at times, and by a fault message in the instrument cluster. It also indicates a problem if the diagnostic tool cannot connect or the fault memory cannot be cleared.

• The warning light stays on permanently or comes on at times.
• The instrument cluster shows a fault message.
• The diagnostic tool cannot find the control unit.
• The fault memory cannot be cleared.

With such a finding, airbags and seatbelt pretensioners may possibly not trigger in an emergency. Therefore have the finding checked promptly.

Which vehicles is the AA6T-14B321-CA fitted in?

The unit AA6T-14B321-CA is fitted in these vehicles: Ford Fiesta 7 ’09 (2008-2017). The part number on the unit shows whether the information fits your case.

The list of affected vehicles is provided as an overview.

• Ford Fiesta 7 ’09 (2008-2017)

Compare the part number on the label of the unit with this information. Have the fault memory read out beforehand, to be certain that a plug or a cable is not the cause.

For the same vehicles, we also repair control units with the part numbers C1BT-14B321-CF, H1BT-14B321-AH, H1BT-14B321-AJ.

How does the repair of the AA6T-14B321-CA work?

First read out the fault memory and attach the log. Then disconnect the battery and remove the control unit. Create the repair order online, and then send in the well-packed unit.

Airbag24 checks the control unit on the test bench, repairs defective components, deletes the stored crash data and carries out a function test. You then receive your own unit back. 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 AA6T-14B321-CA get to Airbag24?

One option is to send the unit in as a parcel, the other is a UPS collection that you book for an extra charge. UPS takes care of returning the unit after the repair.

The printed repair order goes into the parcel. Pack the control unit well padded and shockproof.