Airbag control unit with part number CN15-14B321-BF

What does the airbag control unit CN15-14B321-BF do?

The airbag control unit CN15-14B321-BF coordinates the airbags and seatbelt pretensioners of Ford. It evaluates the crash sensors, decides within milliseconds in a collision, and monitors the overall system.

If it detects a fault, the fault is stored in the memory and reported via the airbag warning light.

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

Why does the control unit CN15-14B321-BF fail?

The most common cause is crash data from an accident, even without an airbag having deployed. A standard diagnostic tool cannot remove this data. In addition, aged electronics, cold solder joints, moisture at plug connections and voltage spikes can cause faults in the control unit CN15-14B321-BF.

Crash data remains in the memory until it is erased during the repair. As a result, the message persists, even if the vehicle drives without any noticeable problems.

The other causes concern the condition of the electronics. Components age, solder joints can make poor contact, moisture and corrosion attack plugs, and voltage spikes occur, for example with a weak battery or a jump start.

How can you tell that the CN15-14B321-BF is defective?

The airbag warning light shows the state of the system; it lights up permanently or intermittently. Fault messages come on top of this, along with a lost connection between the diagnostic tool and the control unit CN15-14B321-BF, and a fault memory that cannot be cleared.

The warning light in the instrument cluster is the most important indication. If it is permanently lit, this points to a detected fault; if it only flickers now and then, the fault is still present.

A fault message in the display may also appear. In an emergency, airbags and seatbelt pretensioners may possibly not deploy as long as the fault exists.

Which vehicles is the CN15-14B321-BF fitted in?

The control unit CN15-14B321-BF from Ford is fitted in the following vehicles: Ford EcoSport 2 (2012-2015). The details are based on the assignments known so far.

The overview is as follows:

• Ford EcoSport 2 (2012-2015)

Compare the part number on the label with this page. This only tells you that it is the correct unit, nothing more. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a connector or cable is behind the fault.

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 CN15-14B321-BF work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery and only then remove the control unit. Finally, create a repair order online and pack the unit carefully.

At Airbag24, the unit is checked, defective components are replaced, the crash data is deleted and a function test follows. The unit is then sent back to you.

Airbag24 needs 3–4 working days for this work. This time applies only to checking, repairing and testing at Airbag24.

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 CN15-14B321-BF get to Airbag24?

You send the control unit CN15-14B321-BF to Airbag24 in a parcel, or have it collected by UPS for an extra charge. After the repair, it is returned to you by UPS.

The printed repair order goes in the parcel. Pack the unit shock-proof.