Airbag control unit with part number D2BT-14B321-BD

What does the airbag control unit D2BT-14B321-BD do?

The airbag control unit D2BT-14B321-BD controls the restraint system (SRS) of Ford. It processes the measurements from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system constantly. After an accident it stores crash data and locks itself.

During operation the unit checks sensors, wiring and output stages. If it detects a fault, it stores it in the fault memory and reports it via the airbag warning light.

The lock after an accident is part of the system's design. Only the repair lifts it.

Why does the control unit D2BT-14B321-BD fail?

Stored crash data is the most common cause, even if no airbag has deployed. Normal diagnostic tools cannot erase it. Other causes are aging of the electronics, moisture and corrosion at plugs, and voltage spikes.

The crash data stems from an earlier accident and stays in the unit until it is removed during repair. The other causes act independently of this and mainly affect the electronics and their connections.

A weak battery or a jump-start can cause voltage spikes that stress sensitive components. Which cause applies in the individual case is only clarified by examining the unit.

How can you tell that the D2BT-14B321-BD is defective?

A defect shows as the airbag warning light that stays on permanently or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

The airbag warning light in the instrument cluster reports the fault, possibly accompanied by an error message. If no connection to the diagnostic tool can be made and the fault memory cannot be emptied, there is a fault.

Airbags and seatbelt pretensioners may then fail to deploy in an emergency. The indicator is therefore a reason to have the system checked promptly.

Which vehicles is the D2BT-14B321-BD fitted in?

The control unit D2BT-14B321-BD is fitted in these vehicles: Ford Fiesta 7 ’09 (2008-2017).

These vehicles are assigned to the unit:

• Ford Fiesta 7 ’09 (2008-2017)

Compare the part number on the label of the removed unit with this page. This ensures you have the correct unit. Also have the fault memory read out beforehand, because only the log shows whether the control unit is defective or a plug or 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 D2BT-14B321-BD work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Create a repair order online and pack the unit well before sending it. Airbag24 tests it on the test bench, replaces defective components where necessary, erases stored crash data and runs a function test. Your own unit is then returned.

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 D2BT-14B321-BD get to Airbag24?

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

Put the printed repair order in the parcel and pack the unit shockproof.