Airbag control unit with part number GR3T-14B321-DC

What does the airbag control unit GR3T-14B321-DC do?

The airbag control unit GR3T-14B321-DC is the central unit that controls the restraint system (SRS) of Ford. It evaluates the crash sensors and determines within milliseconds in a collision which airbags and seatbelt pretensioners are triggered.

In addition, it monitors the system constantly and records faults in its memory. These messages are output via the airbag warning light in the instrument cluster.

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

Why does the control unit GR3T-14B321-DC fail?

On the GR3T-14B321-DC, the most common cause is crash data stored from an earlier accident, even if no airbag has triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are further causes.

A standard diagnostic tool does not erase the crash data. It remains in the memory until Airbag24 removes it during the repair. This also applies to cases where the accident was a long time ago.

The other causes relate mainly to age and environment. Electronics age, solder joints can go cold, and moisture or corrosion affects the plug connections. Voltage spikes arise, for example, from a weak battery or a jump start.

How can you tell that the GR3T-14B321-DC is defective?

The airbag warning light in the instrument cluster lights up on the GR3T-14B321-DC permanently or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light itself is a message from the control unit, which you see while driving. It shows the detected fault and stays on as long as the fault exists.

Whether the cause lies in the unit or in the wiring cannot be read from the display alone. Only the readout of the fault memory clarifies that.

Which vehicles is the GR3T-14B321-DC fitted in?

The GR3T-14B321-DC is fitted in these vehicles: Ford Mustang 6 S550 (2014-2023).

For this part number, the following vehicles are on record at Airbag24:

• Ford Mustang 6 S550 (2014-2023)

Comparing the part number on the label of the removed unit with this page only ensures that it is the correct unit. Have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 285010835, AM2T-14B321-AC, MR3T-14B321-EA.

How does the repair of the GR3T-14B321-DC work?

For the GR3T-14B321-DC, first read out the fault memory and attach the log, then disconnect the battery and remove the control unit. Then create the repair order online. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test before your own unit is returned.

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 GR3T-14B321-DC get to Airbag24?

You send the control unit GR3T-14B321-DC as a parcel to Airbag24, or you book a UPS collection for an extra charge. The return after the repair is handled by UPS.

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