Airbag control unit with part number CL3Z-14B321-B

What does the airbag control unit CL3Z-14B321-B do?

The airbag control unit CL3Z-14B321-B is the central control unit in the restraint system (SRS) of Ford. It assesses the crash sensors, decides within milliseconds in the event of an impact whether airbags and seatbelt pretensioners are triggered, and checks the system continuously.

Faults appear as an entry in the fault memory and via the airbag warning light in the vehicle. After an accident the unit records crash data and locks itself; the lock is lifted only by the repair.

Why does the control unit CL3Z-14B321-B fail?

With the CL3Z-14B321-B, the most common cause lies in crash data left behind by an accident, even if no airbag was triggered. Other possible causes include aged components, cold solder joints, moisture and corrosion, and voltage spikes.

The stored crash data remains in the unit until it is properly removed. A normal diagnostic tool cannot delete it; this can only be done as part of the repair.

The other causes concern the electronics themselves: components age, solder joints can go cold, and moisture or corrosion disturb the contacts. Voltage spikes arise, for example, from a weak battery or a jump start.

How can you tell that the CL3Z-14B321-B is defective?

A defect on the CL3Z-14B321-B shows itself through a lit airbag warning light, an error message in the instrument cluster, a diagnostic tool that cannot establish a connection to the control unit, or a fault memory that cannot be cleared.

The signs in detail:

• airbag warning light in the instrument cluster, permanently or intermittently
• error message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• fault memory that cannot be cleared

A defective control unit can, in an emergency, result in airbags and seatbelt pretensioners failing to deploy. The warning is therefore to be taken seriously.

Which vehicles is the CL3Z-14B321-B fitted in?

The vehicles with the control unit CL3Z-14B321-B include these: Ford F-150 12th generation (2009-2014).

The overview below lists the vehicles recorded for this part number.

• Ford F-150 12th generation (2009-2014)

Comparing the number on the label with this page only shows whether it is the right unit. Whether the control unit is defective or a plug or cable is causing the problem is shown only by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 9L34-14B321-EK, CL34-14B321-AB, CL34-14B321-BB, CL3Z-14B321-A, DL34-14B321-BC.

How does the repair of the CL3Z-14B321-B work?

The process begins with reading out the fault memory of the CL3Z-14B321-B, whose log you attach to the unit. Then disconnect the battery, remove the control unit, create the repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is checked, defective components are replaced, the stored crash data is deleted and a functional test is carried out.

The 3–4 working days refer only to this work. Finally, the unit returns 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 CL3Z-14B321-B get to Airbag24?

You can send the CL3Z-14B321-B in as a parcel. Alternatively, UPS collects the parcel from you for an extra charge; the return after the repair also runs via UPS.

Pack the unit securely to withstand impact and enclose the printed repair order.