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

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

The airbag control unit KX7T-14B321-DC manages the restraint system (SRS) in Ford. It receives the messages from the crash sensors, works out from them which airbags and seatbelt pretensioners fire in an emergency, and checks the components continuously. After an accident, it stores crash data and locks itself.

The electronics work closely with the firing circuits so that decisions can be made without delay. Faults the unit detects are shown via the airbag warning light in the instrument cluster.

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

The most common cause is stored crash data that remains after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Ageing electronic components, cold solder joints, moisture or corrosion in plug connections, and voltage spikes are also possible causes.

The crash data then stays in memory, even if the car looks inconspicuous from the outside.

Besides the crash data, ageing and environmental influences cause problems. Aged components, cold solder joints and moisture in plug connections belong to these, as do voltage spikes, which occur for example with a weak battery or when jump-starting.

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

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, and the diagnostic tool has no connection to the control unit. The fault memory also cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

If the light becomes visible, a check can quickly narrow down the failure. A light that only comes on now and then justifies a check just as much as one that stays on permanently.

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

The airbag control unit KX7T-14B321-DC from Ford is fitted in these vehicles: Ford Focus 4 ’18 (2018-2022) and 4 ’18 Facelift (from 2022). Your vehicle registration document shows whether your car is one of them.

We have compiled the vehicles for this part number here:

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

Comparing the part number on the label of the removed unit with this page shows that you have the correct unit. Whether the control unit is defective, or whether a plug or a cable causes the fault, is only clarified by reading out the fault memory before removal.

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

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

First have the fault memory read out and attach the log. Then disconnect the battery, only afterwards remove the control unit and create a repair order online. After that, pack the unit well and send it in.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Processing usually takes 3–4 working days, calculated for checking, repairing and testing only. The unit then 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-DC get to Airbag24?

You send the control unit KX7T-14B321-DC as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 brings it back to you by UPS.

The printed repair order goes into the parcel, and the control unit is packed shock-proof.