Airbag control unit with part number 65.77-6946384

What is the function of the airbag control unit 65776946384?

The airbag control unit 65776946384 is the central control unit of the restraint system (SRS) for BMW. It evaluates the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are deployed, and monitors the system continuously.

If the unit detects a fault, it indicates it via the airbag warning light in the instrument cluster. The design is a box: a flat, wide housing whose label reads “SGM” and “LEAR”.

Because this design has its own limits when it comes to repair, we state right here what our work is limited to: fault 93F9, the voltage reserve or energy reserve.

Why does the control unit 65776946384 fail?

Fault 93F9 is caused by a defect in the energy reserve or the power supply of the control unit 65776946384. In general, aged electronic components, cold solder joints, moisture and corrosion, or voltage spikes can damage the electronics of a control unit.

Voltage spikes occur, for example, when jump-starting or when changing the battery. Which cause applies to your unit is only shown by the test on the test bench. For the repair, it is enough for the fault memory to contain fault 93F9.

Regarding the crash data: with this design it is not located in the control unit but in another module of the airbag system. If you would like to have crash data deleted, please get in touch with us beforehand. Then we will clarify what is possible.

How can you tell that the control unit 65776946384 is defective?

You can recognise the defect by the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and by fault 93F9 in the fault memory. As long as it persists, airbags and seatbelt pretensioners may fail to deploy in an emergency.

• The airbag warning light lights up permanently or intermittently.
• A message about the restraint system appears in the instrument cluster.
• The diagnostic tool cannot connect to the control unit, or the fault memory shows fault 93F9.

The warning light alone does not say which fault is present. Only reading out the fault memory shows it, and only with 93F9 can we repair this unit. If the fault memory shows a different fault, we cannot fix it on this design.

Which vehicles is the control unit 65776946384 fitted in?

The control unit 65776946384 is fitted in this vehicle: BMW 5 Series E60 Saloon.

This vehicle is listed:

• BMW 5 Series E60 Saloon

Compare the part number on the label of the removed unit with this page; this merely ensures that you have the right unit in front of you. In addition, have the fault memory read out beforehand. Only this shows whether the control unit is defective or whether a plug or cable is the cause, and whether fault 93F9 is entered.

In this vehicle there is also a compact control unit with an “ACSM” label alongside the box. That is a different design with its own part numbers; this page applies only to the box.

How does the repair of the control unit 65776946384 work?

Have the fault memory read out at a specialist workshop first and enclose the log. The battery is then disconnected and only after that is the control unit removed. Next you create a repair order online and send in the well-packed unit; the log must show fault 93F9.

Airbag24 checks the unit on the test bench, replaces the defective components of the energy reserve or power supply, and carries out a function test. We do not fix faults other than 93F9 on this design.

Processing at Airbag24 generally takes 3–4 working days. After that, your own unit is sent back 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.

Crash data is not part of this repair: if you would like to have it deleted, please get in touch with us beforehand.

How does the control unit 65776946384 get to Airbag24?

You send the control unit in as a parcel or, for an extra charge, book a UPS collection. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel and pack the unit so that it is shock-proof and survives transport undamaged.