Airbag control unit with part number 31692084801Q

What does the airbag control unit 31692084801Q do?

The airbag control unit 31692084801Q runs the restraint system (SRS) in BMW vehicles. It evaluates the sensor signals and decides within milliseconds in an emergency which airbags and seatbelt pretensioners to trigger. After an accident it stores crash data and locks itself.

The unit monitors the entire system continuously. If it detects a fault, it displays it via the airbag warning light in the instrument cluster. In normal driving without a fault, it hardly stands out in everyday use.

The lock is lifted only by the repair.

Why does the control unit 31692084801Q fail?

The most common cause is crash data from an accident, even if no airbag has deployed. Also possible are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

Stored crash data cannot be erased with an ordinary diagnostic tool. Which of the other causes applies in an individual case only becomes clear once the fault memory has been read out. The individual causes are:

• aged electronic components
• cold solder joints
• moisture and corrosion on connectors
• voltage spikes, for example from a weak battery or jump-starting

During repair at Airbag24, stored crash data are erased.

How can you tell that the 31692084801Q is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears there. In addition, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared.

The warning light shows the fault as soon as the system detects it. That is why it is the most important sign and should be taken seriously.

In an emergency, the airbags and seatbelt pretensioners may then fail to trigger. A prompt check is therefore worthwhile.

Which vehicles is the 31692084801Q fitted in?

The control unit 31692084801Q is fitted in these vehicles: BMW 5 Series E39 (1995-2004). Whether your vehicle is among them is shown by comparing it with the list.

The vehicles at a glance:

• BMW 5 Series E39 (1995-2004)

On the label: compare the part number on the label of the removed unit with this page. That only ensures that you have the right unit. On the fault memory: have it read out before removal. Only the result shows whether the control unit is defective or a connector or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 65 77 6 919 781, 65 77 6 919 789, 65.77-6900727, 65.77-6920848, 6577-6997257, 6577-8372521.

How does the repair of the 31692084801Q work?

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

The sequence is set for safety reasons: the control unit is removed from the vehicle only after the fault memory has been read out and the battery disconnected.

On the test bench Airbag24 examines the unit and fixes what is found there. Afterwards your own unit is sent back to you.

Processing at Airbag24 usually takes 3–4 working days. This time covers only checking, repairing and testing at our end, not reading out, removal or shipping.

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 31692084801Q get to Airbag24?

You send the control unit 31692084801Q as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant.