Airbag control unit with part number AM5T-14B321-BD

What does the airbag control unit AM5T-14B321-BD do?

The unit AM5T-14B321-BD controls the restraint system (SRS) of Ford. It analyses the crash sensors, decides in a crash within milliseconds on triggering airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

During operation the control unit monitors the connected components continuously. This means it is ready as soon as an accident occurs, and it reports faults immediately.

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

Why does the control unit AM5T-14B321-BD fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. In addition there are aged electronics, cold solder joints, moisture and corrosion at plugs, as well as voltage spikes.

A normal diagnostic tool cannot erase this crash data. Airbag24 erases it during the repair.

Other causes in brief:

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the AM5T-14B321-BD is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition there is a missing connection to the diagnostic tool and a fault memory that cannot be cleared. In that case airbags and seatbelt pretensioners may fail to deploy in an emergency.

So watch the airbag warning light, because it shows the defect without you having to measure anything yourself. A display that appears only intermittently remains a sign of a fault and should be checked.

Which vehicles is the AM5T-14B321-BD fitted in?

The control unit AM5T-14B321-BD 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). Whether your vehicle is affected can be clarified before removal.

To give an orientation, the list of vehicles starts here:

• 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)

For assignment, first compare the part number on the label of the removed unit with this page, and also the fault memory. The comparison only confirms that it is the right unit. Only reading out the fault memory shows whether the control unit itself is defective or whether 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 AM5T-14B321-BD work?

Have the fault memory read out first and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send in the well-packed unit. Airbag24 tests it on the test bench, repairs defective components, erases stored crash data and carries out a function test.

This sequence is fixed for safety reasons, so the order remains mandatory.

Processing at Airbag24 usually takes 3–4 working days.

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 AM5T-14B321-BD 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 your unit by UPS.

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