Airbag control unit with part number DM5T-14B321-EJ

What does the airbag control unit DM5T-14B321-EJ do?

The airbag control unit DM5T-14B321-EJ evaluates the restraint system data for Ford. In the event of an accident, it decides within a very short time whether airbags and seatbelt pretensioners are triggered. It indicates faults in this system via the airbag warning light.

In addition, the control unit continuously monitors the sensors and wiring of the system and stores events.

If an accident occurs, the unit creates crash data and locks itself. This section does not say more about it.

Why does the control unit DM5T-14B321-EJ fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot delete it. Other causes include ageing electronics, cold solder joints, moisture, corrosion at plug connections and voltage spikes.

The unit also creates crash data when no airbag has deployed. Airbag24 deletes it as part of the repair.

The other causes are of a general nature. Electronic components age, solder joints can be cold, and moisture or corrosion damage plug connections.

Jump-starting or a weakened battery can also cause voltage spikes that stress the electronics. The test shows which cause is present.

How can you tell that the DM5T-14B321-EJ is defective?

You can recognise a fault mainly by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Other signs may also appear. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The signs at a glance:

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection between diagnostic tool and control unit
• fault memory cannot be cleared

The light is a warning signal from the restraint system and must not be ignored.

Therefore, have the fault memory read promptly so that it becomes clear what the cause is.

Which vehicles is the DM5T-14B321-EJ fitted in?

The part number DM5T-14B321-EJ belongs to Ford. The control unit is fitted in these vehicles: Ford C-Max 2 (2010-2015) and 2 Facelift (2015-2019); Ford Grand C-Max 2 Facelift (2015-2019) and 2 (2010-2015).

The following overview shows the vehicles to which this unit is assigned.

• Ford C-Max 2 (2010-2015)
• Ford C-Max 2 Facelift (2015-2019)
• Ford Grand C-Max 2 Facelift (2015-2019)
• Ford Grand C-Max 2 (2010-2015)

Before removal, compare the part number on the unit's label with this page. This only confirms whether it is the right unit, not whether it is defective. For that, first have the fault memory read, as this shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 1790083, 285001452, 285011577, AM5T-14B321-AG, DM5T 14B321 SA, DM5T-14B321-EH.

How does the repair of the DM5T-14B321-EJ work?

It starts with reading the fault memory with the enclosed log. Then you disconnect the battery and remove the control unit. You create the repair order online and send in the unit. At Airbag24, processing usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, repairs defective components, deletes the stored crash data and carries out a function test. Only then is your own unit sent 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 DM5T-14B321-EJ get to Airbag24?

You send the unit to Airbag24 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 unit shock-proof.