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

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

The airbag control unit AM5T-14B321-BG is the central control unit of the restraint system (SRS) of Ford. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The device reports faults via the airbag warning light in the instrument cluster. Monitoring runs for as long as the vehicle has power.

In everyday use the work of the control unit stays out of sight. It only becomes visible when a fault occurs.

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

The most common cause is crash data stored after an accident, even when no airbag has triggered. A normal diagnostic tool cannot erase them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The device records crash data at the moment of impact. They remain in memory until they are deliberately erased and can keep the fault memory occupied even when nothing can be seen on the vehicle any more.

The other causes tend to develop gradually. An ageing component or a damp contact can distort signals before a complete failure occurs.

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

A defect in the AM5T-14B321-BG shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently. A fault message in the instrument cluster, no connection to the diagnostic tool, or a fault memory that cannot be cleared are also signs.

A diagnostic tool that cannot connect to the control unit does not automatically mean the control unit is defective. The cause may just as well be in the wiring or the plug.

While the finding persists, airbags and seatbelt pretensioners may not trigger in an emergency. Please have the warning light checked rather than ignoring it.

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

The control unit AM5T-14B321-BG 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 overview shows the vehicles recorded for this part number:

• 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)

First compare the part number on the label of your removed unit with this page. This only confirms that you have the right unit, and nothing more. Also have the fault memory read out before you remove the control unit. Only this log 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-BG work?

First have the fault memory read out and attach the log, then disconnect the battery and only afterwards remove the control unit AM5T-14B321-BG. Next create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. 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 AM5T-14B321-BG get to Airbag24?

You send the control unit AM5T-14B321-BG in 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.