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

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

The airbag control unit AM5T-14B321-BF coordinates the restraint system (SRS) of Ford. It checks the signals from the crash sensors, decides in the event of an accident which airbags and seatbelt pretensioners trigger, and monitors the entire system. After an accident, it stores crash data and locks itself.

The evaluation takes place within milliseconds so that the protective systems act at the right moment. The unit works regardless of whether the vehicle is driving or standing.

If the unit detects a fault, it stores it in the fault memory and indicates it via the airbag warning light.

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

The most common cause is crash data stored after an accident, even if no airbag has deployed; an ordinary diagnostic tool cannot delete it. Other causes include aged components, cold solder joints, moisture and voltage spikes.

Crash data remains stored until Airbag24 deletes it during the repair. Further causes in overview:

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

Which of these causes is present is determined only by the inspection on the test bench.

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

A defect on the AM5T-14B321-BF shows itself through the airbag warning light in the instrument cluster being on permanently or intermittently, through fault messages in the instrument cluster, through a missing connection from the diagnostic tool and through a fault memory that cannot be cleared.

These are the typical signs:

• Airbag warning light, permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then possibly not trigger. The light is therefore a warning signal, not a note you can postpone.

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

The control unit AM5T-14B321-BF 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 list names the vehicles on record.

• 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 ensures that it is the right unit. Have the fault memory read out in advance, because only the log shows whether the control unit 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-BF work?

First read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit; afterwards create a repair order online and send in the unit well packed. Airbag24 generally needs 3–4 working days to process the unit.

Before removal, disconnect the battery from the vehicle electrical system so that the airbag circuits are de-energised.

Airbag24 then examines the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. The unit then returns 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 AM5T-14B321-BF get to Airbag24?

You send the control unit AM5T-14B321-BF as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS. Put the printed repair order into the parcel and pack the unit shockproof.

A suitable box with padding material is enough to keep the unit undamaged on the way.