Airbag control unit with part number LT1T-14B321-AA

What does the airbag control unit LT1T-14B321-AA do?

The airbag control unit LT1T-14B321-AA coordinates the restraint system (SRS) at Ford. It processes the measurements from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners to trigger, and checks the system continuously. Detected faults are shown via the airbag warning light.

The sensors are located at various points in the vehicle and send their data to the control unit. The evaluation takes place there while the impact is still in progress.

After an accident the unit stores crash data and locks itself.

Why does the control unit LT1T-14B321-AA fail?

The most common cause is stored crash data that remains after an accident even if no airbag was triggered; a normal diagnostic tool cannot delete it. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data remains in the unit's memory. A normal diagnostic tool cannot clear this memory.

The other causes lie in the electronics themselves. Components age, solder joints can go cold, and moisture or corrosion at the plug connections impairs contact.

Voltage spikes, for example from a weak battery or when connecting to a jump start, stress the circuit. Such influences can lead to faults in the control unit.

How can you tell that the LT1T-14B321-AA is defective?

A defect shows on the airbag warning light in the instrument cluster, which lights up constantly or intermittently, and in a fault message there. In addition, the diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared.

The control unit reports a fault to the warning light when it detects one. In an emergency, airbags and seatbelt pretensioners may not trigger in the event of a defect, which is why this display must be taken seriously.

A lack of contact with the diagnostic tool can also be caused by cables or plugs, not only by the unit itself.

Which vehicles is the LT1T-14B321-AA fitted in?

The LT1T-14B321-AA is fitted in these vehicles: Ford Transit Connect 2 ’13 Facelift (2018-2023) and 2 ’13 (2013-2018); Ford Tourneo Connect 2 ’13 (2013-2018) and 2 ’13 Facelift (2018-2023).

This selection shows which vehicles the part number fits.

• Ford Transit Connect 2 ’13 Facelift (2018-2023)
• Ford Transit Connect 2 ’13 (2013-2018)
• Ford Tourneo Connect 2 ’13 (2013-2018)
• Ford Tourneo Connect 2 ’13 Facelift (2018-2023)

Before removing the unit, compare the part number on the label with this page. That only shows that you have the correct unit in front of you. Have the fault memory read out before removing the unit. Only that result 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 DT1T-14B321-AE, DT1T-14B321-AF, DT1T-14B321-AG, DT1T-14B321-DE, DT1T-14B321-DF, DT1T-14B321-DG.

How does the repair of the LT1T-14B321-AA work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Airbag24 needs 3–4 working days for checking, repairing and testing.

Then create a repair order online and send the well-packed unit in. Airbag24 checks it on the test bench, replaces defective components, deletes stored crash data and performs a function test. Afterwards 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 LT1T-14B321-AA get to Airbag24?

Shipping is by parcel, or by UPS collection that can be booked for an extra charge. The return is handled by UPS on behalf of Airbag24.

The printed repair order is included in the parcel, and the unit is packed shock-proof.