Airbag control unit with part number CK4Z-14B321-CF

What does the airbag control unit CK4Z-14B321-CF do?

The CK4Z-14B321-CF is the airbag control unit of Ford for the restraint system (SRS). Its task is to read the crash sensors, determine within milliseconds of an accident whether airbags and seatbelt pretensioners are triggered, and monitor the system continuously.

It indicates faults via the airbag warning light. After a crash it stores crash data and locks itself.

A repair is the only way to lift this lock again.

Why does the control unit CK4Z-14B321-CF fail?

Stored crash data is the most common cause: after a crash it stays in the unit even if no airbag has deployed, and it cannot be erased with a normal diagnostic tool. Added to this are aged components, cold solder joints, moisture and corrosion on the plugs, and voltage spikes.

Airbag24 erases this data during the repair; the process is part of the regular procedure.

Aged components and cold solder joints are hardly visible from outside. Moisture and corrosion, on the other hand, attack the plug connections, and voltage spikes arise, for example, from a weak battery.

How can you tell that the CK4Z-14B321-CF is defective?

A defect in the unit shows mainly through the airbag warning light in the instrument cluster. The further signs are:

• the airbag warning light, which stays on permanently or intermittently
• an error message in the instrument cluster
• no connection from the diagnostic tool to the control unit
• a fault memory that cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. Such messages deserve a prompt check.

Which vehicles is the CK4Z-14B321-CF fitted in?

The Ford models with the CK4Z-14B321-CF are: Ford Transit 7 ’14 (from 2014).

The list follows here:

• Ford Transit 7 ’14 (from 2014)

Compare the part number on the label of the removed unit with this page. This only shows whether it is the correct unit. Also have the fault memory read out before you change anything on the vehicle; only that 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 CK4Z-14B321-CF work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the CK4Z-14B321-CF. Afterwards you create the repair order online.

Send the unit well packed. Airbag24 checks it on the test bench, repairs defective components and erases the crash data. A function test follows; processing usually takes 3–4 working days.

Afterwards your own unit is returned.

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 CK4Z-14B321-CF get to Airbag24?

You can send the control unit CK4Z-14B321-CF as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order with the parcel and pack the unit shockproof.