Airbag control unit with part number CK4T-14B321-DF

What does the airbag control unit CK4T-14B321-DF do?

The airbag control unit CK4T-14B321-DF coordinates the restraint system (SRS) in vehicles of the Ford brand. From the signals of the crash sensors it works out, in an accident, when and which airbags and seatbelt pretensioners are triggered, and it monitors all components continuously.

If it detects a fault, it stores it and shows it via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself. Only the repair lifts the lock again.

Why does the control unit CK4T-14B321-DF fail?

The most common cause is crash data stored in the unit after an accident, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes also lead to failures of the CK4T-14B321-DF.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

The other causes include ageing of the electronics, cold solder joints and corrosion on contacts. Moisture harms plug connections, and brief voltage spikes, as occur with a weak battery or a jump start, stress the components.

How can you tell that the CK4T-14B321-DF is defective?

On the CK4T-14B321-DF you recognise a defect from the airbag warning light in the instrument cluster, which lights up permanently or intermittently, from a fault message in the instrument cluster, from a diagnostic tool without connection to the control unit, and from a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then possibly not deploy in an emergency.

The warning light is one of the most important signals the vehicle gives. It reports the fault as soon as it occurs and should not be ignored.

If any of these indications appears, have the system checked promptly.

Which vehicles is the CK4T-14B321-DF fitted in?

The control unit CK4T-14B321-DF is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

These vehicles are known to us for this part number so far:

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page. The part number on the label must match this page. That only confirms the unit is the correct one.

Have the fault memory read out in advance. Only this shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers BK2T-14B321-BF, BK3T-14B321-AC, DT1T-14B321-DF, KT1T-14B321-KD, LK4Z-14B321-C, LK4Z-14B321-E.

How does the repair of the CK4T-14B321-DF work?

First you read out the fault memory and enclose the log. Then you disconnect the battery. Only then remove the CK4T-14B321-DF, create a repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components. Then Airbag24 erases the stored crash data and carries out a function test. 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 CK4T-14B321-DF get to Airbag24?

You send the control unit CK4T-14B321-DF as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel. Pack the unit shock-resistant.