Airbag control unit with part number KX7T-14B321-BD

What does the airbag control unit KX7T-14B321-BD do?

The airbag control unit KX7T-14B321-BD is the central control unit of the restraint system (SRS) in Ford. It evaluates signals from the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After a crash, it stores crash data and locks itself.

The unit works in the background as long as the vehicle is live. It checks sensors, wiring and the control of the restraint systems and records every deviation in the fault memory.

A fault is reported via the airbag warning light on the dashboard. If the light stays off, the control unit has not reported a fault.

Why does the control unit KX7T-14B321-BD fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data is a record that the unit creates after an impact. A standard diagnostic tool cannot erase it. Airbag24 removes it during the repair.

The other causes work over time and through the environment. Electronic components age, cold solder joints can become unreliable, and moisture together with corrosion attacks plug contacts. Voltage spikes, for example when starting with a jump start, put strain on the electronics.

How can you tell that the KX7T-14B321-BD is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

These signs appear singly or together. The light alone is a clear signal that something in the system is wrong.

In an emergency, airbags and seatbelt pretensioners may then possibly fail to trigger. It is therefore worth having the fault memory read out promptly rather than ignoring the warning.

Which vehicles is the KX7T-14B321-BD fitted in?

The control unit KX7T-14B321-BD is fitted in these vehicles: Ford Focus 4 ’18 (2018-2022) and 4 ’18 Facelift (from 2022).

The list shows the models in which this unit is recorded. Check your vehicle by make and model.

• Ford Focus 4 ’18 (2018-2022)
• Ford Focus 4 ’18 Facelift (from 2022)

Compare the part number on the label of the removed unit with this page, so that you can be sure it is the right unit. Please also have the fault memory read out before you touch the control unit, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers KX7T 14B321 BB.

How does the repair of the KX7T-14B321-BD work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Next, create a repair order online and send the well-packed unit in. Airbag24 checks it, replaces defective components, erases the crash data and carries out a function test.

The order is a safety measure: first the fault memory is read out, then the battery is disconnected, and only after that is the control unit removed.

Checking, repairing and the function test at Airbag24 usually take 3–4 working days. Afterwards your own unit goes back 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 KX7T-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 to you by UPS.

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