Airbag control unit with part number L1TT-14B321-AB

What does the airbag control unit L1TT-14B321-AB do?

The airbag control unit L1TT-14B321-AB manages the restraint system (SRS) at Ford. It evaluates the crash sensors and determines in the event of an accident which airbags and seatbelt pretensioners are triggered.

The electronics check the system continuously. If they detect a fault, the airbag warning light in the instrument cluster comes on.

After an accident it stores crash data and then locks itself. Keep this state in mind for every decision about the repair.

Why does the control unit L1TT-14B321-AB fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered. Further causes are aged components, cold solder joints, moisture and corrosion, as well as voltage spikes.

Crash data cannot be erased with common diagnostic tools. Airbag24 erases it during the repair.

The other causes concern ageing and the environment. Components lose reliability over the years, solder joints can make poor contact, and moisture attacks plug connections.

Voltage spikes in the vehicle electrical system, for example from a weak battery or jump-starting, are also among the causes.

How can you tell that the L1TT-14B321-AB is defective?

The airbag warning light in the instrument cluster lights up permanently or only intermittently. Accompanying this, fault messages appear, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

These signs are typical:

• The airbag warning light lights up in the instrument cluster.
• Fault messages appear in the instrument cluster.
• The diagnostic tool cannot establish a connection to the control unit.
• The fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not trigger. Please take such signs seriously and have the system checked promptly.

Which vehicles is the L1TT-14B321-AB fitted in?

You can most quickly compare your vehicle registration document with this page to classify your own car. The L1TT-14B321-AB is fitted in these vehicles: Ford Puma ’20 (2019-2024).

Here are the vehicles stored for this part number:

• Ford Puma ’20 (2019-2024)

Comparing the part number on the label of the removed unit with this page merely confirms that it is the right unit. Have the fault memory read out as well. Only then does it show whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2511273, N1BT-14B321-HA, PV4T-14B321-AB, YS6T-14B056-AC.

How does the repair of the L1TT-14B321-AB work?

First read out the fault memory and enclose the log, then disconnect the battery and remove the unit. Then create a repair order online and pack the unit well.

At Airbag24 the unit is examined on the test bench, defective components are repaired, crash data is erased and a function test is carried out.

Airbag24 usually needs 3–4 working days for checking, repairing and testing. Afterwards your 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 L1TT-14B321-AB get to Airbag24?

You send the control unit L1TT-14B321-AB as a parcel or optionally book a UPS collection. After the repair Airbag24 sends it back by UPS.

Put the printed repair order in the parcel, and pack the unit shockproof.