Airbag control unit with part number 51939105

What does the airbag control unit 51939105 do?

The airbag control unit 51939105 coordinates the restraint system (SRS) in Chrysler vehicles. Based on the sensor signals, it calculates within milliseconds in an impact which airbags and seatbelt pretensioners are triggered. After a crash, it locks itself.

Even during normal driving the unit keeps working and continuously checks all connected components. If it detects a fault, it stores it and lights up the airbag warning light.

Why does the control unit 51939105 fail?

The most common cause of the control unit 51939105 failing is stored crash data left behind after an accident, even if no airbag has deployed. A normal diagnostic tool cannot remove it; Airbag24 erases it during the repair. Aged electronics, cold solder joints, moisture and voltage spikes also play a role.

Crash data therefore remains in the memory even if nothing else conspicuous has happened apart from the accident. The other causes tend to develop gradually: electronic components age, and plug connections lose contact due to moisture and corrosion.

Voltage spikes, for example from a weak battery or from starting with external power, can also damage the unit.

How can you tell that the 51939105 is defective?

You recognise a defect in the 51939105 by an airbag warning light in the instrument cluster that lights up permanently or intermittently. An error message in the display, a lack of contact with the diagnostic tool or a fault memory that cannot be cleared also indicate it.

Typical signs at a glance:

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

With such a defect, airbags and seatbelt pretensioners may not trigger in an emergency. Have the cause checked promptly.

Which vehicles is the 51939105 fitted in?

The control unit 51939105 is fitted in these vehicles: Chrysler Ypsilon 846 (2011-2015).

Here you can see the vehicle for which the number is stored:

• Chrysler Ypsilon 846 (2011-2015)

Compare the number on the label of the removed unit with this page. This only shows that it is the correct unit; the comparison says nothing more. Also have the fault memory read out, because only this result shows whether the control unit itself 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 51833230, 52052831.

How does the repair of the 51939105 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 51939105.

Then create a repair order online and pack the unit well before sending it in. Airbag24 checks the control unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, your own unit goes back to you.

Processing at Airbag24 generally takes 3–4 working days, and this time covers only checking, repairing and testing.

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 51939105 get to Airbag24?

You send the control unit 51939105 as a parcel, or alternatively book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

You put the printed repair order into the parcel and pack the unit shock-proof.