Airbag control unit with part number 56043999AA

What does the airbag control unit 56043999AA do?

The airbag control unit 56043999AA manages the restraint system (SRS) of Dodge. It continuously checks the crash sensors and the connected triggers, decides in an accident within milliseconds on the firing of airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

The unit works quietly in the background as long as the system is in order. It makes itself noticed mainly in the event of faults. After an accident it stores crash data and locks itself.

For the deployment it is essential that the control unit, sensors and wiring match one another.

Why does the control unit 56043999AA fail?

The most common cause is crash data that remains in the unit after an accident, even if no airbag has fired. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also causes.

Crash data is not accessible to a diagnostic tool. It therefore remains until the repair removes it. This also applies if the airbag did not deploy in the accident.

The other causes tend to develop gradually: electronic components age, solder joints become brittle over time, and moisture promotes corrosion at the plugs. Voltage spikes, for example from a weak battery or a jump-start, can additionally stress the electronics.

How can you tell that the 56043999AA is defective?

If the airbag warning light stays on permanently or only comes on intermittently, that is an indication. Likewise, an error message, a missing connection to the diagnostic tool and a fault memory that cannot be cleared point to a defect. In an emergency, the airbags and seatbelt pretensioners may then possibly not trigger.

The display in the instrument cluster cannot be overlooked. If it appears, have the cause clarified rather than ignoring it.

Which vehicles is the 56043999AA fitted in?

The unit 56043999AA is fitted in these models: Dodge Ram Van B-Serie (1995-2003).

Here is the list at a glance:

• Dodge Ram Van B-Serie (1995-2003)

Comparing the part number on the label of the removed unit with this page only confirms that the unit is the correct one. Have the fault memory read out beforehand; it shows whether the control unit itself is affected or whether a plug or cable is.

For the same vehicles, we also repair control units with the part numbers 56043221AG, 56043355, 56043999AB.

How does the repair of the 56043999AA work?

Have the fault memory read out and attach the log, disconnect the battery, and only then remove the control unit. Then create a repair order online and send the well-packed unit in. Airbag24 checks it first on the test bench, repairs damaged components, erases the crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days.

The sequence is mandatory because safety depends on it. 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 56043999AA get to Airbag24?

The shipment is made in your own parcel, or UPS collects the unit at your location for an extra charge. The return journey also runs via UPS.

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