Airbag control unit with part number DL34-14B321-BC

What does the airbag control unit DL34-14B321-BC do?

The airbag control unit DL34-14B321-BC is the central processing unit of the restraint system (SRS) in Ford. It reads the crash sensors, decides in the event of an accident, within milliseconds, whether airbags and seatbelt pretensioners are triggered, and monitors the entire system.

During operation, it checks sensors, wiring and control circuits. If it detects a fault, it creates an entry in the fault memory and displays it via the airbag warning light.

After an accident, the unit records crash data and locks itself. This lock is only lifted by the repair at Airbag24.

Why does the control unit DL34-14B321-BC fail?

Stored crash data from an accident is the most common cause with the control unit DL34-14B321-BC, even if no airbag has deployed. Other causes include ageing components, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

Crash data cannot be erased with a conventional diagnostic tool. Airbag24 removes it as part of the repair.

The remaining causes lie in the electronics and their connections. Age-related changes to components, cold solder joints and moisture at plug connections lead to contact faults. Voltage spikes, for example from a weak battery or jump-starting, place additional strain on the circuitry.

How can you tell that the DL34-14B321-BC is defective?

The airbag warning light in the instrument cluster lights up on the control unit DL34-14B321-BC permanently or intermittently, accompanied by a fault message. A diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may not deploy. Take this display seriously and have the system checked promptly.

A check with the diagnostic tool shows which faults are stored and forms the basis for the next decision.

Which vehicles is the DL34-14B321-BC fitted in?

The control unit DL34-14B321-BC was fitted in these vehicles: Ford F-150 12th generation (2009-2014). Whether your car is one of them can be checked against the vehicle papers.

The following vehicles are known to us for this unit:

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

First, compare the part number on the label of the removed unit with this page. This only confirms that you have the correct unit. Then have the fault memory read out, because only this result shows whether the control unit is faulty or whether a connector or cable is the cause.

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, CL3Z-14B321-B.

How does the repair of the DL34-14B321-BC work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit DL34-14B321-BC. Next, create the repair order online and pack the unit well.

Airbag24 then checks the unit on the test bench and repairs defective components. Afterwards, Airbag24 deletes the stored crash data and carries out a function test.

For testing, repairing and checking at Airbag24, we usually allow 3–4 working days. Your own unit is then returned 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 DL34-14B321-BC get to Airbag24?

For shipping, you can choose between a parcel or, for an extra charge, a UPS collection. Your own unit DL34-14B321-BC is returned by UPS after the repair.

Enclose the printed repair order with the parcel. Pack the unit shock-proof so that it arrives undamaged.