Airbag control unit with part number LK4T-14B321-AE

What does the airbag control unit LK4T-14B321-AE do?

In a vehicle from Ford, the airbag control unit LK4T-14B321-AE coordinates the entire restraint system (SRS). From the crash sensors it calculates within milliseconds in an accident which airbags and seatbelt pretensioners to trigger. It indicates faults in the system via the airbag warning light.

The unit works constantly in the background and checks the connected components.

As soon as an accident is registered, it stores crash data and locks itself.

Why does the control unit LK4T-14B321-AE fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; an ordinary diagnostic tool does not erase it. Ageing, cold solder joints, moisture and voltage spikes are also possible.

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

Airbag24 removes the crash data as part of the repair.

The inspection at Airbag24 establishes which of the other causes is present.

How can you tell that the LK4T-14B321-AE is defective?

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

Take the warning light seriously, even if it only comes on intermittently.

A fault memory that you have read out will tell you what the cause is.

Which vehicles is the LK4T-14B321-AE fitted in?

The control unit LK4T-14B321-AE is fitted in these vehicles: Ford Transit 7 ’14 (from 2014).

The following list shows which vehicles are affected:

• Ford Transit 7 ’14 (from 2014)

Before removal, compare the part number on the label with this page. That tells you that you have the right unit. Whether the control unit itself is defective or whether a plug or cable is the cause is shown only by the fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers BK2T-14B321-BF, BK3T-14B321-AC, DT1T-14B321-DF, KT1T-14B321-KD, LK4Z-14B321-C, LK4Z-14B321-E.

How does the repair of the LK4T-14B321-AE work?

First have the fault memory read out and enclose the log, then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send the unit in, well packed. At Airbag24 the unit is checked on the test bench, defective components are replaced, the crash data is erased and a functional test is carried out; processing usually takes 3–4 working days.

The log and the repair order belong to the consignment.

Afterwards your unit comes back 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 LK4T-14B321-AE get to Airbag24?

Either you pack the control unit LK4T-14B321-AE as a parcel or you book a UPS collection for an extra charge. After the repair you receive the unit back from Airbag24 by UPS.

Enclose the printed repair order with the parcel, and the unit is packed shockproof.