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

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

The airbag control unit CN15-14B321-AE is responsible for the restraint system (SRS) of Ford. It evaluates signals from the crash sensors and, in an accident, decides within fractions of a second which airbags and seatbelt pretensioners are triggered.

The electronics monitor the system permanently in the background. If they find a fault, they report it via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and locks itself. Only a repair removes the lock.

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

Crash data from an accident is the most common cause, even if no airbag has deployed. This data cannot be cleared with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is created as soon as the unit records an event. An airbag does not need to have deployed for this. The data remains until a repair removes it.

The other causes act over a longer period. Electronics age, solder joints can become weak spots, and plug connections suffer from moisture and corrosion. Voltage spikes, for example from a weak battery or a jump start, add further stress.

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

The airbag warning light in the instrument cluster stays on permanently or intermittently. A fault message, no connection to the diagnostic tool and a fault memory that cannot be cleared also belong to this picture.

The following signs point to a problem:

• The airbag warning light in the instrument cluster stays on or flashes.
• A fault message appears in the instrument cluster.
• The diagnostic tool receives no connection to the control unit.
• The fault memory cannot be cleared.

In an emergency, the airbags and seatbelt pretensioners may not be able to deploy. Please act promptly.

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

The control unit CN15-14B321-AE is fitted in these vehicles: Ford EcoSport 2 (2012-2015). The listing shows whether the unit matches your car before you remove it.

For this unit, the following models are on record:

• Ford EcoSport 2 (2012-2015)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Also have the fault memory read out, because only this log shows whether the control unit itself is defective or whether a connector or cable is the cause.

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-AE work?

First, follow these steps: read out the fault memory, enclose the log, disconnect the battery and remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and send the unit in, packed well. Please keep to this order, because it serves safety.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards, your own 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 CN15-14B321-AE get to Airbag24?

You send the control unit CN15-14B321-AE as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.