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

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

The airbag control unit CK4T-14B321-AD of Ford controls the restraint system: it evaluates the crash sensors, determines in an accident which airbags and seatbelt pretensioners trigger, and monitors the system continuously. After an accident, it stores crash data and locks itself.

Occupant protection depends on this unit deciding correctly within milliseconds. For this reason it checks its surroundings continuously, and faults are shown via the airbag warning light.

In the vehicle, the unit works in the background and only becomes noticeable when it reports a fault.

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

The most common cause on the control unit CK4T-14B321-AD is crash data stored after an accident, even if no airbag has deployed. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Airbag24 removes crash data during the repair; a standard diagnostic tool cannot erase it.

Further causes come into question in particular:

• ageing of the electronic components
• solder joints that have gone cold
• moisture and corrosion at the plugs
• voltage spikes in the vehicle electrical system, for example with a weak battery or a jump start

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

A defect in the CK4T-14B321-AD shows up first on the airbag warning light, which can stay on permanently or intermittently in the instrument cluster. Error messages may be added, and the diagnostic tool cannot reach the control unit. Airbags and seatbelt pretensioners may then not deploy in an emergency.

A fault memory that cannot be erased confirms the suspicion. Anyone who sees the light has a clear reason to have the system checked.

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

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

The list of vehicles follows directly below:

• Ford Transit 7 ’14 (from 2014)

Comparing the part number on the label of the device with this page confirms that it is the right unit. Have the fault memory read out separately, because the result shows whether the control unit is defective or whether a plug or cable is behind the fault.

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-AD work?

First have the fault memory read out and enclose the log. Then disconnect the battery on the CK4T-14B321-AD and only afterwards remove the control unit. Next, create the repair order online and pack the unit well.

There, Airbag24 examines the unit on the test bench. Defective components are repaired, crash data is erased, and the process ends with a function test. Processing usually takes 3–4 working days. The unit then comes 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-AD get to Airbag24?

The CK4T-14B321-AD comes to Airbag24 as a parcel, or you arrange a UPS collection for an extra charge. The return after the repair is likewise made by UPS.

The printed repair order goes into the parcel, and the control unit remains packed in a shock-proof way.