Airbag control unit with part number 65.77-6946388

What does the airbag control unit 65.77-6946388 do?

As the central control unit of the restraint system (SRS) for BMW, the airbag control unit 65.77-6946388 collects the signals from the crash sensors, decides in milliseconds in an accident whether airbags and seatbelt pretensioners are deployed, and monitors the system continuously.

The airbag warning light in the instrument cluster shows when the unit finds a fault. Its housing is flat and wide; we call this design the box. The label reads “SGM” and “LEAR”.

A clear limit applies to this design: we fix only fault 93F9 (voltage reserve or energy reserve), no other.

Why does the control unit 65.77-6946388 fail?

Fault 93F9 concerns the voltage reserve or energy reserve of the control unit 65.77-6946388. In general, aged electronic components, cold solder joints, moisture and corrosion, or voltage spikes can damage the electronics of a control unit.

Only the test on the test bench reveals which cause applies to your unit. A prerequisite for the repair is that the fault memory contains 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 and we will clarify what is possible.

How can you tell that the 65.77-6946388 is defective?

A defect shows itself by the airbag warning light in the instrument cluster and by an entry in the fault memory; for the repair, it must be fault 93F9 (voltage reserve or energy reserve). In this condition, 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 shows fault 93F9 in the fault memory.

Only the last point decides whether we can repair the unit: we do not fix other faults on this design. Therefore have the fault memory read out before removal.

Which vehicles is the 65.77-6946388 fitted in?

The control unit 65.77-6946388 belongs to these vehicles: BMW 5 Series E60 Saloon and E61 Touring.

The list shows the vehicles on record:

• BMW 5 Series E60 Saloon
• BMW 5 Series E61 Touring

Match the part number on the label of the removed control unit against this page; that only ensures that you have the right unit. Independently of that, the fault memory should be read out before any removal: it shows whether the control unit is defective or a plug or cable is the cause. For our repair, the fault memory must contain fault 93F9.

In these vehicles 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.

For the same vehicles, we also repair control units of this design with the part numbers 65.77-6960381, 65.77-6946384, 65776962703, 65776962886, 65776975684.

How does the repair of the 65.77-6946388 work?

You first read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit. Afterwards 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 defective components and carries out a function test.

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

If you would like to have crash data deleted, please get in touch with us before you create the repair order.

How does the control unit 65.77-6946388 get to Airbag24?

The removed control unit travels to Airbag24 as a parcel; for an extra charge, UPS collects it from you. The repaired unit is likewise returned by UPS.

Enclose the printed repair order in the parcel and pack the control unit so that it is protected against impacts and survives transport undamaged.