Airbag control unit with part number P56043703AC

What does the airbag control unit P56043703AC do?

The airbag control unit P56043703AC manages the restraint system (SRS) of Dodge. From the crash sensors it calculates within milliseconds which airbags and seatbelt pretensioners trigger in a crash, and it monitors the system continuously. It shows faults via the airbag warning light.

The control unit checks whether the sensors and triggers are properly connected and whether the signals are correct. This keeps the system ready for use in everyday driving.

After an accident, the unit stores crash data and locks itself. This page does not provide further details on this state.

Why does the control unit P56043703AC fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from weak batteries or jump-starting.

The unit records the accident event, and the normal diagnostic tool cannot reach this entry. The consequence is that the fault persists even if the vehicle behaves inconspicuously.

Aged components and cold solder joints cannot always be detected while driving. Moisture and corrosion at plug connections create transition resistance, and voltage spikes occur as soon as the battery is weak or the vehicle is started with external power.

How can you tell that the P56043703AC is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition, a fault message appears in the instrument cluster, and the diagnostic tool does not find the control unit. The fault memory also cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

• The airbag warning light stays on permanently.
• The airbag warning light flashes at irregular intervals.
• A message about the airbag system appears in the instrument cluster.
• The diagnostic tool cannot establish a connection to the control unit.
• The fault memory remains even though you want to clear it.

The airbag warning light is the first indication you should take seriously. It points to a detected fault, and it does not go out on its own until the cause has been removed.

Which vehicles is the P56043703AC fitted in?

The control unit P56043703AC is fitted in these vehicles: Dodge Ram DR/DH/D1/DC/DM Facelift (2006-2009) and DR/DH/D1/DC/DM (2002-2006).

The overview comes from our data for this part number.

• Dodge Ram DR/DH/D1/DC/DM Facelift (2006-2009)
• Dodge Ram DR/DH/D1/DC/DM (2002-2006)

On the one hand, compare the part number on the label of your removed unit with this page. Beyond confirming that you have the right unit, this comparison tells you nothing more. On the other hand, have the fault memory read out before removal. Only this log shows whether the control unit is defective or whether a plug or a cable is the cause.

How does the repair of the P56043703AC work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and remove the control unit only afterwards. Finally, create a repair order online and send in the well-packed unit.

This sequence is important for safety reasons. Removal begins only once the log and the disconnected battery are in place.

Airbag24 tests the unit on the test bench, replaces defective components and erases stored crash data. A function test follows. Processing usually takes 3–4 working days, and that applies to checking, repairing and testing at Airbag24 alone. 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 P56043703AC get to Airbag24?

You send the unit to Airbag24 as a parcel or book a UPS collection for an extra charge. Airbag24 sends the repaired unit back by UPS.

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