Airbag control unit with part number D3BT-14B321-BE

What does the airbag control unit D3BT-14B321-BE do?

The airbag control unit D3BT-14B321-BE coordinates the restraint system (SRS) of Ford. It evaluates the signals from the impact sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows detected faults via the airbag warning light.

Monitoring runs in the background throughout the journey. Among other things, the unit checks the power supply, the connections and the sensor values.

After an accident, the unit records crash data and locks itself. This point also plays a role among the causes of failure.

Why does the control unit D3BT-14B321-BE fail?

The most common cause is crash data stored after an accident, even where no airbag has been triggered; a normal diagnostic tool cannot erase it. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump starting, are also possible.

Crash data is held in the memory of the control unit, and nothing can be seen from outside. For this reason, it is worth asking about a previous accident even when the vehicle looks undamaged.

The other causes tend to act over time. Ageing components, fine cracks in solder joints and moisture at the plugs degrade the signal quality, while voltage dips place additional strain on the electronics.

How can you tell that the D3BT-14B321-BE is defective?

A defect shows itself through the airbag warning light, which lights up permanently or intermittently, and through a fault message in the instrument cluster. In addition, the diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners could then fail to trigger.

Typical signs are:

• airbag warning light in the instrument cluster that stays on permanently
• airbag warning light that comes on only intermittently
• fault message in the instrument cluster
• diagnostic tool does not find the control unit
• fault memory cannot be cleared

The warning light is not a minor matter, even if the vehicle appears to drive normally. Have it checked promptly.

Which vehicles is the D3BT-14B321-BE fitted in?

The airbag control unit D3BT-14B321-BE is fitted in these vehicles: Ford Fiesta 7 ’09 (2008-2017).

The list shows the vehicles that we have recorded for this control unit.

• Ford Fiesta 7 ’09 (2008-2017)

Two steps come before removal. First, compare the part number on the label with this page; this only ensures that you have the right unit. Then have the fault memory read out, because this result alone shows whether the control unit itself 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 D3BT-14B321-BE work?

First read out the fault memory and attach the log. Then disconnect the battery, remove the control unit, create the repair order online and send the unit in well packed. Airbag24 checks and repairs the unit, erases the crash data and tests the function.

The sequence is for your safety and is therefore binding. Keep to it even if the removal seems simple.

At Airbag24, checking, repairing and testing usually takes 3–4 working days. Defective components are replaced, and afterwards your own unit is returned 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 D3BT-14B321-BE get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS. Place the printed repair order in the parcel and pack the control unit shock-proof.

A firm outer packaging with padding protects the electronics in transit.