Airbag control unit with part number 89170-53890

What does the airbag control unit 89170-53890 do?

The airbag control unit 89170-53890 coordinates the restraint system (SRS) of Lexus. From the signals of the crash sensors it calculates in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered, and it monitors the system constantly. It indicates faults via the airbag warning light in the instrument cluster.

In everyday use the unit works unobtrusively in the background. After an accident it stores crash data and then locks itself.

Why does the control unit 89170-53890 fail?

Stored crash data is the most common cause of failure, even if no airbag was triggered in the accident. An ordinary diagnostic tool cannot erase it. Further possible causes are aged electronic components, cold solder joints, moisture and corrosion at plugs, and voltage spikes from a weak battery or a jump start.

That no airbag has fired does not mean that nothing has been stored. The crash data stays in the memory until Airbag24 removes it during the repair.

The other causes lie in the electronics themselves or in their connections. Which of them applies to your unit is only shown by the inspection on the test bench.

How can you tell that the 89170-53890 is defective?

The airbag warning light in the instrument cluster lights up permanently or only occasionally. In addition an error message appears, the diagnostic tool cannot find the control unit, or the fault memory cannot be emptied.

In the event of a defect, the airbags and seatbelt pretensioners may fail to deploy in an emergency, because the control unit cannot reliably control the deployment. If you notice these signs, have the system checked before you continue driving.

Which vehicles is the 89170-53890 fitted in?

The control unit 89170-53890 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The following vehicles are listed for this control unit:

• Lexus LS XF50 (from 2018)

Check the part number on the label of the removed unit against this page. That only confirms the right unit. The cause is established by the fault memory read out beforehand, because it shows whether the control unit itself is affected or a plug or cable.

For the same vehicles, we also repair control units with the part numbers 89170-50K81, 89170-50K83, 89970-50090.

How does the repair of the 89170-53890 work?

Have the fault memory read out and enclose the log with the unit. Then disconnect the battery and only afterwards remove the control unit. Next create the repair order online, then pack the unit carefully for sending.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a functional test. Processing usually takes 3–4 working days. Afterwards 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.

How does the control unit 89170-53890 get to Airbag24?

The control unit reaches Airbag24 either as a parcel or via a UPS collection that you book for an extra charge. After the repair it comes back to you by UPS.

Pack the unit shockproof and enclose the printed repair order.