Airbag control unit with part number GN15-14B321-LB

What does the airbag control unit GN15-14B321-LB do?

The GN15-14B321-LB is the airbag control unit of the restraint system in Ford vehicles. It reads out the crash sensors and decides in a collision which airbags and seatbelt pretensioners are triggered. This decision is made within milliseconds.

In addition the system is monitored continuously. After a collision the unit stores crash data and locks itself. It indicates faults via the airbag warning light.

Without an intact control unit, the protective effect of the system is limited.

Why does the control unit GN15-14B321-LB fail?

Stored crash data is the most common cause on the GN15-14B321-LB, even when no airbag has deployed. An ordinary diagnostic tool does not erase it. Further causes lie in aged electronic components, cold solder joints, corrosion from moisture at plug connections and voltage spikes such as with a weak battery or jump-starting.

The statement that crash data can be erased means: Airbag24 removes it during the repair.

Plug connections in particular are vulnerable once moisture gets in. Corrosion increases the transition resistance, and the unit then receives signals unreliably.

How can you tell that the GN15-14B321-LB is defective?

A defect on the GN15-14B321-LB shows up through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message in the instrument cluster may also appear. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

Typical signs at a glance:

• The airbag warning light stays on permanently or keeps coming on.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

The system reports the fault itself, so the light is a clear finding.

Which vehicles is the GN15-14B321-LB fitted in?

The GN15-14B321-LB is fitted in this vehicle: Ford EcoSport 2 Facelift (2015-2022). The assignment comes from the stored data for Ford.

The list of vehicles can be found here:

• Ford EcoSport 2 Facelift (2015-2022)

Comparing the part number on the label of the removed unit with this page ensures that it is the correct unit. It does not explain the cause, however. Only a fault memory read out beforehand shows whether the control unit is defective or whether a plug or a cable is behind it.

For the same vehicles, we also repair control units with the part numbers DN1T-14B321-EC, GN15-14B321-AF, GN15-14B321-GJ, GN1Z-14B321-AE, GN1Z-14B321-AK.

How does the repair of the GN15-14B321-LB work?

The check, repair and function test at Airbag24 usually take 3–4 working days. You have the fault memory read out, attach the log, disconnect the battery and remove the GN15-14B321-LB. Afterwards you create the repair order online.

On the test bench Airbag24 checks the unit, replaces defective components, erases the crash data and carries out a function test. After that the unit goes back to you by UPS.

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 GN15-14B321-LB get to Airbag24?

You send the control unit GN15-14B321-LB as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.