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

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

The airbag control unit DM5T-14B321-EG is the central control unit of the restraint system (SRS) for Ford. It evaluates the crash sensors, decides within milliseconds in the event of an impact whether airbags and seatbelt pretensioners are triggered, and monitors the entire system. It shows faults via the airbag warning light.

While driving, the unit continuously checks the signals from the sensors, the seatbelt buckles and the firing circuits. If it finds a deviation, it creates an entry in the fault memory.

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

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

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot remove it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

After an impact, the crash data remains in the control unit, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Airbag24 deletes the crash data during the repair.

The remaining causes concern electronics and wiring. Aged components and cold solder joints disrupt the function, while moisture and corrosion affect the plug connections. Voltage spikes in the vehicle electrical system put additional strain on the circuit.

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

A defect shows up as the airbag warning light in the instrument cluster staying on permanently or intermittently, as a fault message in the instrument cluster, as the diagnostic tool being unable to connect to the control unit, and as a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The airbag warning light in the instrument cluster stays on permanently or intermittently and is the clearest sign. A fault message in the instrument cluster may appear as well. If the diagnostic tool cannot connect to the control unit or the fault memory cannot be cleared, that is a further indication. In this case, have the fault memory read out before you plan any further steps.

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

The control unit DM5T-14B321-EG 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 list shows the vehicles for which this part number is known:

• 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)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a 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-EG work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed. At Airbag24, inspection, repair and testing usually take 3–4 working days.

The order of these steps is for your safety. The readout with log comes first, then the battery is disconnected, and only after that is the unit removed. Pack the unit carefully before you send it.

At Airbag24, the unit is checked on the test bench. Defective components are repaired, stored crash data is deleted, and a function test completes the work. 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 DM5T-14B321-EG get to Airbag24?

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

Enclose the printed repair order in the parcel and pack the unit shock-proof.