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

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

The airbag control unit AA6T-14B321-FA is the central control unit of the restraint system (SRS) for Ford. It evaluates the crash sensors, determines in an accident within milliseconds the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident, it stores crash data and locks itself.

If the control unit detects a fault, it reports it via the airbag warning light. The display in the instrument cluster therefore reflects the current state of the system.

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

Stored crash data is the most common cause, even if no airbag was triggered. A normal diagnostic tool does not erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible causes.

Crash data alone gives no finding about a particular component. For that, the unit has to be examined.

Aged components play a role, and cold solder joints can likewise lead to a fault. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

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

The airbag warning light lights up permanently or intermittently, and an error message appears. In addition, the diagnostic tool finds no connection to the control unit AA6T-14B321-FA, and the fault memory cannot be cleared.

While driving, the warning light in the instrument cluster is easy to notice. If it stays on, that is a clear signal that there is a fault in the system.

A timely diagnosis is therefore advisable. Until then, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

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

The allocation of vehicles is based on Airbag24's data for this part number. The airbag control unit AA6T-14B321-FA is fitted in these vehicles: Ford Fiesta 7 ’09 (2008-2017).

The vehicles allocated to this part number are listed here:

• Ford Fiesta 7 ’09 (2008-2017)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit. Having the fault memory read out beforehand, on the other hand, clarifies whether the control unit is defective or whether a plug or a cable is 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-FA work?

First, have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit AA6T-14B321-FA. Next, create a repair order online and send the unit in well packed.

At Airbag24 the control unit first goes through a check on the test bench, then defective components are repaired, crash data is deleted and a function test is carried out. Your own unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days. This period covers only checking, repairing and testing.

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-FA get to Airbag24?

You can send the control unit AA6T-14B321-FA as a parcel or have it collected by UPS for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pad the unit shock-resistant.