Airbag control unit with part number CL34-14B321-AB

What does the airbag control unit CL34-14B321-AB do?

The airbag control unit CL34-14B321-AB is the control unit of the restraint system (SRS) of Ford. It evaluates the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

The unit also monitors the system continuously and reports faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit CL34-14B321-AB fail?

The most common cause is crash data in the memory, even if no airbag has deployed. Other causes are ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery.

The entries cannot be removed with a commercially available reader, so they stay in the memory. As long as that is the case, the message also remains visible in the vehicle.

The other causes concern contacts and components that cannot be told apart from a crash entry without inspection. At Airbag24 the crash data is erased and the other findings are checked on the unit.

How can you tell that the CL34-14B321-AB is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, an error message appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may therefore not deploy.

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory cannot be cleared

The warning light is a clear warning sign that you should have checked promptly.

Which vehicles is the CL34-14B321-AB fitted in?

The control unit CL34-14B321-AB is fitted in these vehicles: Ford F-150 12th generation (2009-2014). Comparing part numbers only establishes the identity of the unit, not its condition.

These vehicles are known to us for this part number:

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

Compare the part number on the label of your removed unit with this page. Also have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

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

How does the repair of the CL34-14B321-AB work?

First have the fault memory read out and enclose the log. Then disconnect the battery; only after that does the control unit come out. Create the repair order online and send the well-packed unit in; at Airbag24, inspection, repair and function test usually take 3–4 working days.

Airbag24 inspects the unit on the test bench, replaces defective components and erases the crash data. The function test follows, and then your own repaired 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 CL34-14B321-AB get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Print out the repair order and enclose it with the parcel. Pack the unit shockproof.