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

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

The airbag control unit LK4T-14B321-BE controls the restraint system (SRS) for Ford. It evaluates the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered.

During operation it checks the entire system continuously. If it detects a fault, the airbag warning light shows it. After an accident it stores crash data and locks itself.

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

Crash data from an earlier accident is the most common cause, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, such as those caused by a weak battery.

Crash data cannot be deleted with a standard diagnostic tool. Airbag24 clears it during the repair, so that the control unit can then be checked without old entries.

The other causes lie in the electronics themselves or in the connections to them. Even a jump start can cause voltage spikes that affect the unit, and corrosion on plugs impairs signal transmission.

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

The airbag warning light in the instrument cluster lights up constantly or intermittently. A fault message in the instrument cluster appears alongside it, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may possibly not deploy in an emergency. The light must therefore be taken seriously, even if the vehicle otherwise runs normally.

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

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

The overview of the vehicles for this part number follows.

• Ford Transit 7 ’14 (from 2014)

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. Have the fault memory read out beforehand, because only this result reveals 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 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-BE work?

You first read out the fault memory and enclose the log. In the next step you disconnect the battery before removing the control unit. Then create a repair order online and send the unit well packed.

Airbag24 checks the unit on the test bench and replaces defective components. Afterwards Airbag24 deletes the stored crash data and carries out a function test. For checking, repairing and testing at Airbag24, 3–4 working days are usually planned, after which your own unit goes 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-BE get to Airbag24?

You can send the LK4T-14B321-BE as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

The printed repair order and the shock-proof packed control unit go into the parcel.