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

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

The airbag control unit CN15-14B321-DF is the central control unit of the restraint system for Ford. In a collision it decides within milliseconds whether the airbags and seatbelt pretensioners are triggered, and it monitors the system without interruption.

The evaluation is based on the signals from the crash sensors. The unit reports faults via the airbag warning light in the instrument cluster, so the condition of the system remains visible at all times.

After an accident, it stores crash data and locks itself.

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

The most common cause with the CN15-14B321-DF is stored crash data after an accident, even if no airbag has deployed. Other possible causes are ageing electronics, cold solder joints, moisture and corrosion at plugs, and voltage spikes.

Crash data consists of entries in the memory of the control unit. A normal diagnostic tool cannot erase them, so the message remains until the repair has been carried out.

The other causes concern the electronics themselves and their connections. Components age, solder joints can be cold, and moisture changes the contact at plug connections. Voltage spikes, for example from a weak battery or a jump start, put the circuit under additional load.

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

A defect in the CN15-14B321-DF shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Fault messages, no contact from the diagnostic tool and a fault memory that cannot be cleared are added to this.

• airbag warning light lights up permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool cannot establish a connection to the control unit
• fault memory cannot be cleared

If one of these findings appears, airbags and seatbelt pretensioners may fail to deploy in an emergency. This display deserves prompt attention.

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

The control unit CN15-14B321-DF is fitted in these vehicles: Ford EcoSport 2 (2012-2015).

The list below shows the vehicles that are recorded in the Airbag24 database for this part number.

• Ford EcoSport 2 (2012-2015)

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. Have the fault memory read out beforehand, because only this log shows whether the control unit itself is defective or whether a plug 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-DF work?

Before removal, have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the CN15-14B321-DF. Next, create the repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

On the test bench, Airbag24 examines the control unit, replaces defective components, erases the stored crash data and carries out a function test. The same unit is then returned to you.

The time stated refers only to the work at Airbag24, not to reading out the fault memory, removal or shipping.

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-DF get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shockproof.