Airbag control unit with part number 89170-50N10

What does the airbag control unit 89170-50N10 do?

The airbag control unit 89170-50N10 is the central electronics of the restraint system (SRS) for Lexus. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on airbags and seatbelt pretensioners, and monitors the system continuously.

If it reports a fault, the airbag warning light in the instrument cluster comes on. After an accident it stores crash data and locks itself.

It works together with further sensors and triggers that are distributed around the vehicle.

Why does the control unit 89170-50N10 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. With a standard diagnostic tool these data cannot be deleted from control unit 89170-50N10, but Airbag24 deletes them during the repair. Other causes are aged components and moisture or corrosion on plug connections.

Electronic components age over time. Solder joints can be cold, and moisture attacks contacts.

Voltage spikes, for example from a weak battery or jump-starting, also count among the causes.

How can you tell that the 89170-50N10 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently as soon as there is a fault on the 89170-50N10. In addition there is a fault message in the instrument cluster and no connection between the diagnostic tool and the control unit. The fault memory also cannot be cleared.

The warning light is the signal the vehicle itself gives.

In an emergency, airbags and seatbelt pretensioners with a faulty control unit may fail to deploy. Please have this checked promptly.

Which vehicles is the 89170-50N10 fitted in?

Before removal, compare the vehicle details with your car. Control unit 89170-50N10 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The list below shows the vehicles in which this control unit was installed.

• Lexus LS XF50 (from 2018)

Comparing the part number on the label of the removed unit with this page only ensures that it is the right unit. Having the fault memory read out is just as important, because only this result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-50K81, 89170-50K83, 89170-50L00, 89170-50L03, 89170-53790, 89170-53820.

How does the repair of the 89170-50N10 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove control unit 89170-50N10 and create a repair order online. Send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. The unit then goes back to you.

The sequence serves safety and must be observed.

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 89170-50N10 get to Airbag24?

You send control unit 89170-50N10 as a parcel, or you book a UPS collection from your home for an extra charge. After the repair Airbag24 sends it back by UPS.

Important are shockproof packaging and the printed repair order in the parcel.