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

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

The airbag control unit CK4T-14B321-AE controls the restraint system in Ford vehicles. It evaluates the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

During operation, the unit checks the connected components. If it finds a fault, it creates an entry in the fault memory and reports it via the airbag warning light.

After an accident, the control unit stores crash data and then locks itself.

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

The most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture at plug connections and voltage spikes.

Crash data is created even in accidents where nobody notices anything about the airbags. The control unit stores it anyway, and it remains in the unit.

Weak batteries and jump starts with high voltage can cause damage. Corrosion on plugs also disrupts the contact.

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

Typical signs are an airbag warning light that lights up permanently or intermittently, an error message in the instrument cluster, and a diagnostic tool with no connection to the control unit. In addition, the fault memory cannot be erased. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

These signs in detail:

• Airbag warning light in the instrument cluster, permanently or intermittently
• Error message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory that cannot be erased

Act promptly if any of these occurs, and have the system inspected.

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

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

The list shows the vehicles for which this part number is stored.

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the right unit. Also have the fault memory read out, because only the result shows whether the control unit is defective or a wire or plug 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-AE work?

You have the fault memory read out and attach the log. Then you disconnect the battery, remove the control unit, create the repair order online and pack the unit well. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

Airbag24 checks the control unit, replaces defective components, erases the 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-AE get to Airbag24?

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

Put the printed repair order in the parcel and pack the unit shock-proof.