Airbag control unit with part number KS7T-14B321-CC

What does the airbag control unit KS7T-14B321-CC do?

The airbag control unit KS7T-14B321-CC controls the restraint system (SRS) for Ford. It evaluates the crash sensors, determines in a crash within milliseconds the triggering of airbags and seatbelt pretensioners, and checks the system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. The sensors supply the data, but the decision on triggering is made in the control unit.

An accident causes the unit to store crash data and lock itself. The next sections explain what causes lie behind this and how the failure can be recognised.

Why does the control unit KS7T-14B321-CC fail?

On the KS7T-14B321-CC, the most common trigger is crash data stored after an accident, even though no airbag was fired. Ageing components, cold solder joints, moisture and corrosion, and voltage spikes are also possible causes.

An ordinary diagnostic tool cannot delete crash data. The memory keeps it until the repair removes it.

Ageing components, cold solder joints and moisture weaken the electronics in different ways. Corrosion at plug connections impairs the contact, and voltage spikes from jump-starting or a weak battery add further stress.

How can you tell that the KS7T-14B321-CC is defective?

A defect on the KS7T-14B321-CC becomes visible through the airbag warning light. Further signs are messages in the instrument cluster, a lack of contact with the diagnostic tool and a fault memory that cannot be emptied.

You can recognise the defect by these signs:

• airbag warning light in the instrument cluster stays on
• airbag warning light in the instrument cluster comes on only intermittently
• fault message in the instrument cluster
• diagnostic tool cannot find the control unit
• fault memory remains after an attempt to clear it

As long as these signs persist, the airbags and seatbelt pretensioners may fail to trigger in an emergency. A communication fault alone does not prove a defect in the unit.

Which vehicles is the KS7T-14B321-CC fitted in?

The control unit KS7T-14B321-CC is fitted in these vehicles: Ford Mondeo 5 ’13 Facelift (2019-2022).

You will find the vehicles from the stored data below.

• Ford Mondeo 5 ’13 Facelift (2019-2022)

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. Have the fault memory read before you do anything to the control unit, as this shows whether the unit itself is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1S7T-14B056, 1S7T-14B056-BG, 2184427, 285010733, DS7T-14B321-BB.

How does the repair of the KS7T-14B321-CC work?

You first have the fault memory of the KS7T-14B321-CC read out and enclose the log. Then disconnect the battery and remove the control unit. Finally, create a repair order online and send the carefully packed unit in.

This sequence is mandatory, because the safety of the airbag system is at stake. Without a log, the test lacks the starting condition.

At Airbag24 the unit is examined on the test bench, repaired if necessary, the crash data is deleted, and a functional test concludes the work. This usually takes 3–4 working days before 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 KS7T-14B321-CC get to Airbag24?

You send the control unit KS7T-14B321-CC as a parcel or, for an extra charge, book a UPS collection. After repair the unit goes back by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-proof.