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

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

The airbag control unit GR3T-14B321-DE belongs to the restraint system (SRS) of Ford and coordinates its airbags and seatbelt pretensioners. In a collision it evaluates the crash sensors and decides within a few milliseconds on deployment. It continuously checks the entire system and indicates detected faults via the airbag warning light.

It monitors the sensors, cables and power supply in the background, and every detected fault is stored in memory. This keeps a record of what happened in the system when the unit is read out later.

After an accident the unit stores crash data and then locks itself. Only the repair lifts this lock, and Airbag24 carries it out on the unit.

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

The most common cause is stored crash data after an accident, even without a triggered airbag. In addition there are ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool, so the fault remains. The other causes concern the ageing of the electronics. Moisture attacks the plug connections, and voltage spikes arise, for example, from a weak battery or from outside help when starting.

Whether one of these causes applies in an individual case can only be clarified by the check. A guess alone is not enough for that.

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

The airbag warning light in the instrument cluster lights up continuously or intermittently. An error message also appears in the instrument cluster. In addition, the diagnostic tool gets no contact with the control unit, and the fault memory cannot be cleared.

If these signs appear, airbags and seatbelt pretensioners may in an emergency not trigger. The warning light must therefore not be overlooked, because it makes the finding visible before an accident does.

With regular use the light stands out when you get in, because it is shown at start-up.

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

The GR3T-14B321-DE is fitted in the following vehicle: Ford Mustang 6 S550 (2014-2023).

The list below shows the affected model series and years of construction.

• Ford Mustang 6 S550 (2014-2023)

On the one hand, comparing the part number on the label of the removed unit with this page is enough to make sure that it is the right unit. On the other hand, have the fault memory read before removal. Only this result 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 285010835, AM2T-14B321-AC, MR3T-14B321-EA.

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

First have the fault memory read and attach the log, then disconnect the battery and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days, counted for checking, repairing and testing.

Afterwards you create the repair order online and send the unit in well packed. Airbag24 examines it on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Then the unit of your own goes back 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 GR3T-14B321-DE get to Airbag24?

You can send the unit as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-resistant.