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

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

The airbag control unit KX7T-14B321-DB is the central control unit of the restraint system (SRS) for Ford. It evaluates the signals from the crash sensors and decides within milliseconds in the event of a crash which airbags and seatbelt pretensioners are triggered. At the same time, it continuously monitors the system and reports faults via the airbag warning light.

During driving, the crash sensors continuously supply measured values. If the evaluation detects an impact that requires deployment, the unit activates the relevant airbags and seatbelt pretensioners.

After a crash, the unit stores crash data and locks itself. This process is part of the safety logic of the system.

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

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other possible causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the memory until it is erased. During repair, Airbag24 takes care of erasing it.

The other causes concern electronics in general. Components age over time, solder joints can be cold, and moisture or corrosion affect plug connections. Voltage spikes, for example from a weak battery or from jump-starting, put additional strain on the electronics.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared. Such signs point to a defect.

In an emergency, airbags and seatbelt pretensioners may not deploy in the event of such a defect. The warning light indicates the defect, so it is worth not ignoring it.

Only reading out the fault memory shows which component is affected. The light alone does not identify this cause.

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

The list is a guide for assignment. The control unit KX7T-14B321-DB is fitted in these vehicles: Ford Focus 4 ’18 (2018-2022) and 4 ’18 Facelift (from 2022).

The vehicles belonging to this number are listed individually here:

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

Two steps help before you send it in. Compare the part number on the label of the removed unit with this page; this only confirms that it is the right unit. Also have the fault memory read out beforehand, because only the result 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 KX7T 14B321 BB.

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

First have the fault memory read out and enclose the log; then disconnect the battery and only then remove the control unit KX7T-14B321-DB. Next, create a repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days; after that, your own unit is 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 KX7T-14B321-DB get to Airbag24?

You send the unit 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 control unit shockproof.