Airbag control unit with part number AR33-14B321-BF

What does the airbag control unit AR33-14B321-BF do?

The airbag control unit AR33-14B321-BF is responsible for the restraint system (SRS) of Ford. It evaluates the crash sensors, determines within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It indicates faults via the airbag warning light.

As long as there is no fault, you notice nothing of the unit in everyday use.

After a crash it stores crash data and locks itself.

Why does the control unit AR33-14B321-BF fail?

The most common cause for AR33-14B321-BF is crash data stored after an accident, even if no airbag was triggered. A diagnostic tool from a workshop does not erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Airbag24 erases the crash data during the repair.

In detail, these causes may apply:

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

Which cause applies in the individual case is only shown by the examination on the test bench.

How can you tell that the AR33-14B321-BF is defective?

The airbag warning light in the instrument cluster indicates a defect in AR33-14B321-BF when it stays on permanently or intermittently. In addition there may be a fault message, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared.

A fault message in the instrument cluster additionally confirms the fault. The light is therefore not a minor hint, but shows the state of the restraint system.

In an emergency, airbags and seatbelt pretensioners may not be able to deploy. Please have the finding checked promptly.

Which vehicles is the AR33-14B321-BF fitted in?

For the assignment, rely on the part number AR33-14B321-BF and not on the model name alone. The control unit AR33-14B321-BF is fitted in these vehicles: Ford Mustang 5 S197 (2004-2014).

The list comes from our assignment to this part number:

• Ford Mustang 5 S197 (2004-2014)

Compare the part number on the label of the removed unit with this page, then you know it is the right unit. In addition, have the fault memory read beforehand, because only the result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers ML3Z-14B321-Z, ML3Z14B321A, MR3T-14B321-EA.

How does the repair of the AR33-14B321-BF work?

First have the fault memory read and attach the log. Then disconnect the battery, only then remove the control unit AR33-14B321-BF and create a repair order online. Then send in the well-packed unit.

At Airbag24 the unit is examined on the test bench, defective components are repaired, crash data is erased and a function test is carried out. Processing there 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 AR33-14B321-BF get to Airbag24?

Either you send the control unit AR33-14B321-BF off in a parcel, or you have it collected by UPS for an extra charge. Airbag24 then brings the repaired unit to you by UPS.

Important are the printed repair order in the parcel and shock-proof packaging.