Airbag control unit with part number LC3Z-14B321-B

What does the airbag control unit LC3Z-14B321-B do?

The airbag control unit LC3Z-14B321-B is the switching centre of the restraint system (SRS) in Ford vehicles. It checks the signals of the crash sensors, determines in an accident which airbags and seatbelt pretensioners fire, and then locks itself.

In operation, the unit monitors all components and stores faults in memory. The airbag warning light in the instrument cluster informs you about faults.

Why does the control unit LC3Z-14B321-B fail?

The most common cause of the control unit LC3Z-14B321-B is crash data stored after an accident, even if no airbag has fired. A normal diagnostic tool cannot remove it; Airbag24 erases it during the repair.

Besides crash data, aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes can come into question. A weak battery or jump-starting can cause such voltage spikes.

How can you tell that the LC3Z-14B321-B is defective?

A defect in the LC3Z-14B321-B shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently. Error messages or connection problems with the diagnostic tool may also occur.

Typical signs are:

• The airbag warning light is on permanently or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool receives no connection to the control unit.
• The fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may not trigger with such a defect. Therefore, have the cause clarified promptly.

Which vehicles is the LC3Z-14B321-B fitted in?

The control unit LC3Z-14B321-B is fitted in these vehicles: Ford F-Series Super Duty 4 P558 (2017-2022).

The assignment in detail:

• Ford F-Series Super Duty 4 P558 (2017-2022)

Compare the number on the label of the removed unit with this page. This only shows that it is the correct unit, nothing more. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers HC3T-14B321-BE, HC3Z-14B321-B, PC3T-14B321-YC.

How does the repair of the LC3Z-14B321-B work?

The repair of the LC3Z-14B321-B begins with reading out the fault memory and attaching the log. Then disconnect the battery and remove the control unit. Airbag24 needs 3–4 working days for checking, repairing and testing.

You then create a repair order online, and the well-packed unit goes to Airbag24. There, defective components are replaced, stored crash data is erased and a function test is carried out before your own unit is returned.

This period refers only to the processing at Airbag24.

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 LC3Z-14B321-B get to Airbag24?

Either you send the control unit LC3Z-14B321-B as a parcel, or you book a UPS collection for an extra charge. The return to you after the repair is also made by UPS.

The printed repair order goes into the parcel. The unit is packed shock-proof.