Airbag control unit with part number 65.77-9130203

What does the airbag control unit 65.77-9130203 do?

As the central control unit of the restraint system (SRS) for BMW, the airbag control unit 65.77-9130203 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” or “SIM” 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 65.77-9130203 fail?

Behind fault 93F9 is a problem with the voltage reserve or energy reserve of the control unit 65.77-9130203. General causes of electronic defects include aged components, cold solder joints, moisture and corrosion, or voltage spikes.

Voltage spikes arise, for example, from a weak battery or when jump-starting. Whether and which of these causes apply to your unit can only be determined during the test.

With this design, the crash data 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 65.77-9130203 is defective?

A defect shows itself by the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and by an entry in the fault memory. For the repair, this entry must be fault 93F9 (voltage reserve or energy reserve). In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

A message about the restraint system in the instrument cluster can also point to the defect. Have the fault memory read out with a diagnostic tool before you remove anything.

If the fault memory shows a fault other than 93F9, we cannot fix it on this design.

Which vehicles is the 65.77-9130203 fitted in?

The control unit 65.77-9130203 belongs to these vehicles: BMW 7 Series E65 and E66 L.

The list shows the vehicles on record:

• BMW 7 Series E65
• BMW 7 Series E66 L

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.

For the same vehicles, we also repair control units of this design with the part numbers 65776920483, 65776950242, 65776967658, 65776929556, 65776949906, 65776922144.

How does the repair of the 65.77-9130203 work?

First have the fault memory read out and enclose the log showing fault 93F9. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit.

At Airbag24 the unit is examined on the test bench, defective components are replaced, and a function test concludes the process.

At Airbag24 this generally takes 3–4 working days, after which we send your own unit back. 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 some deleted, please get in touch with us beforehand.

How does the control unit 65.77-9130203 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 protected against impacts.