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

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

The airbag control unit CK4T-14B321-CE controls the restraint system (SRS) in Ford vehicles. It evaluates the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the system permanently.

It shows detected faults via the airbag warning light in the instrument cluster, so you notice a malfunction in everyday driving.

After an accident the unit stores crash data and locks itself. Only the repair lifts the lock.

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

The most common cause is stored crash data, which remains in the memory after an accident even without an airbag deploying and cannot be erased with a normal diagnostic tool. Further causes are mainly aged components, cold solder joints and moisture at the contacts.

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes from a weak battery or jump-starting

The list covers causes that develop over time, as well as sudden loads.

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

Typical signs are an airbag warning light in the instrument cluster that stays on permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool that cannot connect to the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then possibly not deploy.

• airbag warning light stays on permanently or flickers
• fault message in the instrument cluster
• no connection by the diagnostic tool
• fault memory cannot be cleared

If any of these indications appear, have the system checked promptly rather than waiting to see whether the light goes out.

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

This part number is linked to the following vehicles with us. The control unit CK4T-14B321-CE is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

The assignment we hold is shown here.

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the correct unit. Have the fault memory read out beforehand, because this result shows whether the control unit is defective or 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-CE work?

First have the fault memory read out with a log, and then disconnect the battery before removing the control unit. Then create a repair order online and pack the unit well before sending it in. Airbag24 checks it on the test bench, replaces defective components, deletes the crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days. This time only covers checking, repairing and testing.

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-CE get to Airbag24?

You send the control unit CK4T-14B321-CE in as a parcel or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Enclose the printed repair order in the parcel and make sure the unit is packed shockproof.