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

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

The airbag control unit CK4T-14B321-DG is the central control unit of the restraint system (SRS) for Ford. It evaluates the crash sensors, decides in a crash within milliseconds about airbags and seatbelt pretensioners, and monitors the system continuously. It reports faults via the airbag warning light.

The unit works in the background and checks sensors, wiring and output stages. Deviations are stored in the fault memory and can be read out with a diagnostic tool.

After an accident, it stores crash data and locks itself. This property determines what is possible on the unit in the workshop.

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

Stored crash data is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot delete this data, so the fault persists in the system.

Airbag24 deletes the crash data during the repair. Beforehand, the only thing needed is to have the fault memory read out.

Other causes are also possible:

• ageing electronic components
• cold solder joints
• moisture and corrosion at connectors
• voltage spikes, for example from a weak battery or a jump start

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

The airbag warning light stays on permanently or intermittently, and a fault message in the instrument cluster may be added. Even if the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared, a defect is likely.

The signs are not always unambiguous. A connector or a cable can cause the same symptoms as the control unit itself.

As long as the fault exists, airbags and seatbelt pretensioners may not deploy in an emergency. This should prompt you to act promptly.

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

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

Below you will find the models that are stored for this control unit at Airbag24. The list is intended as a first orientation.

• Ford Transit 7 ’14 (from 2014)

Before removal, compare the part number on the label with this information and have the fault memory read out. Only then is it clear whether the control unit really is defective.

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-DG work?

Before removal, read out the fault memory and enclose the readout log. Disconnect the battery, remove the control unit, create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit, replaces defective components, deletes stored crash data and carries out a function test. Afterwards your own unit is returned 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-DG get to Airbag24?

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

Place the printed repair order in the parcel, and pack the unit shockproof.