Airbag control unit with part number DC3T-14B321-BB

What does the airbag control unit DC3T-14B321-BB do?

The airbag control unit DC3T-14B321-BB belongs to the restraint system (SRS) of Ford and controls it. It receives the messages from the crash sensors, decides within milliseconds which airbags and seatbelt pretensioners are to be triggered, and checks the system without interruption.

If a fault occurs, the unit indicates it via the airbag warning light in the instrument cluster. This display is the first sign that something is wrong in the system.

After an accident, it stores crash data and locks itself.

Why does the control unit DC3T-14B321-BB fail?

In DC3T-14B321-BB, the most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool does not erase it. Other causes play a role as well, which can be briefly summarised.

The other causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

Airbag24 erases the crash data during the repair. We check the remaining points on the unit itself before it is returned.

How can you tell that the DC3T-14B321-BB is defective?

Typical signs of a defect in the DC3T-14B321-BB are the airbag warning light in the instrument cluster, a fault message in the instrument cluster, a diagnostic tool with no contact to the control unit, and a fault memory that cannot be cleared. The light may stay on permanently or intermittently.

• Airbag warning light in the instrument cluster, permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be cleared

If you notice any of these signs, airbags and seatbelt pretensioners may fail to trigger in an emergency. Therefore have the system checked promptly.

Which vehicles is the DC3T-14B321-BB fitted in?

The DC3T-14B321-BB is fitted in these vehicles: Ford F-Series Super Duty 3 P473 (2011-2016). Before removal, make sure that your vehicle is listed here.

This overview lists the vehicles known to us for this control unit.

• Ford F-Series Super Duty 3 P473 (2011-2016)

Comparing the part number on the label of the unit with this page only confirms that it is the right unit. More important is a look at the fault memory: it 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 BC3Z-14B321-M, DC3T-14B321-BA, DC3T-14B321-DC, DC3Z-14B321-D.

How does the repair of the DC3T-14B321-BB work?

First have the fault memory read out and attach the log to the order. Then disconnect the battery and only then remove the control unit. Then create a repair order online and send in the well-packed unit.

This sequence is mandatory for safety reasons. At Airbag24, we then check the unit on the test bench, renew defective components, erase the crash data and carry out a function test.

Processing at Airbag24 usually takes 3–4 working days. After that, the unit is 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 DC3T-14B321-BB get to Airbag24?

You send the control unit DC3T-14B321-BB to Airbag24 as a parcel, or you add a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Print the repair order and put it in the parcel. Pack the unit shock-resistant.