Airbag control unit with part number 9118749-01

What does the airbag control unit 9118749-01 do?

The airbag control unit 9118749-01 coordinates the restraint system (SRS) of BMW. It evaluates the signals from the crash sensors and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

It also monitors all components of the system during continuous operation. It shows detected faults via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and locks itself.

Why does the control unit 9118749-01 fail?

The most frequent cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

Crash data is created as soon as the control unit detects an accident. It remains in memory until it is deliberately erased.

The other causes act over a longer period. Electronic components age, moisture and corrosion attack plug connections, and cold solder joints disrupt contact.

Voltage spikes occur, for example, with a weak battery or when a jump start is connected, and they stress the electronics.

How can you tell that the 9118749-01 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears in the instrument cluster, or the diagnostic tool cannot find the control unit. A fault memory that cannot be cleared is a further sign. In these cases, airbags and seatbelt pretensioners may possibly not deploy in an emergency.

These signs occur individually or together:

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

The warning light is the direct indication from the system and should be clarified promptly.

Which vehicles is the 9118749-01 fitted in?

The control unit 9118749-01 is fitted in these vehicles: BMW 5 Series E60 LCI Saloon (2007-2010) and E60 Saloon (2003-2007).

The vehicles for this part number are shown in the following list.

• BMW 5 Series E60 LCI Saloon (2007-2010)
• BMW 5 Series E60 Saloon (2003-2007)

Compare the part number on the label of the removed unit with this page first. Then have the fault memory read out beforehand. Only this log shows whether the control unit itself is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 31911421401V, 65 77 9 118 749 01, 65 77 911 4214-01, 65.77 9172018-01, 65.77-6946384, 65.77-6946388.

How does the repair of the 9118749-01 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Then create a repair order online and send the unit in well packed; Airbag24 checks it, replaces defective components, erases stored crash data and carries out a function test.

The sequence of the first steps serves safety and is therefore mandatory.

Processing at Airbag24 usually takes 3–4 working days.

Afterwards you receive 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.

How does the control unit 9118749-01 get to Airbag24?

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

Enclose the printed repair order in the parcel and pack the unit shock-proof.