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

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

The airbag control unit AR33-14B321-EA controls the restraint system (SRS) in Ford. It reads the crash sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners fire, and keeps an eye on the system during operation.

It reports faults via the airbag warning light. After a crash it stores crash data and locks itself.

The unit works constantly in the background, and its self-test gives information about the condition of the entire system.

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

The most common cause is stored crash data after an accident, even if no airbag has triggered. Also relevant are aged electronic components, dry joints, moisture or corrosion on plug connectors, and voltage spikes, for example from a weak battery or jump-starting.

Crash data cannot be removed with a normal diagnostic tool. Airbag24 erases them during the repair.

From the outside it is not possible to tell which of these factors apply to your unit. The examination on the test bench provides clarity here.

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

A defect shows up as an airbag warning light that lights up permanently or intermittently, as error messages in the instrument cluster, as a diagnostic tool without connection and as a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

• Airbag warning light stays on permanently or intermittently
• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

A single one of these signs is enough to justify a check. The warning light is the first indication the vehicle gives.

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

The AR33-14B321-EA is fitted in these vehicles: Ford Mustang 5 S197 (2004-2014).

The list of vehicles for this part number:

• Ford Mustang 5 S197 (2004-2014)

Compare the part number on the label of the removed unit with this page, so that you know it is the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or a plug or 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-EA work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the AR33-14B321-EA. Create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days for checking, repairing and testing as a rule.

Airbag24 examines the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards the 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 AR33-14B321-EA get to Airbag24?

You send the AR33-14B321-EA as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant.