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

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

The airbag control unit KX7T-14B321-BC belongs to the restraint system (SRS) of Ford. It checks the impact sensors, determines in a crash within milliseconds the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

If it detects a fault, it indicates this via the airbag warning light in the instrument cluster. After an accident it creates crash data and locks itself.

The monitoring runs in the background, which you barely notice while driving.

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

The most frequent reason is crash data stored after an accident, even without triggered airbags. A normal diagnostic tool cannot erase this data. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

This is easily underestimated, because entries can be stored in the memory even if no airbag has been triggered.

With ageing, moisture and corrosion, the contacts deteriorate over time, and signals no longer arrive cleanly.

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

A defect in the KX7T-14B321-BC is indicated by an airbag warning light that burns permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool without connection, and a fault memory that remains.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy, regardless of how well the vehicle runs in everyday use.

The warning in the instrument cluster must therefore be taken seriously, even if the car otherwise seems flawless.

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

Vehicles are known for this part number. The airbag control unit KX7T-14B321-BC is fitted in these vehicles: Ford Focus 4 ’18 (2018-2022) and 4 ’18 Facelift (from 2022).

This list shows the known models:

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

The part number on the label can be compared with this page, which only confirms the correct unit. Only a fault memory read out beforehand 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-BC work?

Have the fault memory read out and attach the log before you disconnect the battery. Only then remove the control unit. Afterwards create a repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench and replaces defective components. Stored crash data is deleted by Airbag24 during the repair, followed by a function test, and your own unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days, covering 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 KX7T-14B321-BC get to Airbag24?

You send the unit as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel. Pack the unit shockproof so that it arrives undamaged.