Airbag control unit with part number 89170-50K10

What does the airbag control unit 89170-50K10 do?

The airbag control unit 89170-50K10 coordinates the restraint system (SRS) for Lexus. It evaluates the signals from the crash sensors, determines within fractions of a second in an accident which airbags and seatbelt pretensioners are to be triggered, and checks the system during operation. Faults are displayed via the airbag warning light.

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

Without its evaluation there would be no coordinated response from the system, which is why it is the central component of the system.

Why does the control unit 89170-50K10 fail?

The most common cause is stored crash data from an accident, even without a triggered airbag, because a normal diagnostic tool does not erase it. Other causes at a glance:

• aging of electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

The crash data is stored in the unit when an accident is evaluated, and remains there.

The other causes tend to act over longer periods or through external influences on the connections.

How can you tell that the 89170-50K10 is defective?

The airbag warning light in the instrument cluster stays on permanently or lights up from time to time. In addition, a fault message may appear, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may fail to deploy in the event of a defect, and that is exactly what the warning light points to.

The warning is not a minor matter but a direct finding of the control unit, which you can have clarified promptly.

Which vehicles is the 89170-50K10 fitted in?

The 89170-50K10 is fitted in these vehicles: Lexus LS XF50 (from 2018).

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

• Lexus LS XF50 (from 2018)

Using the part number on the label of the removed unit, you only check the unit itself. Have the fault memory read out before sending it in. Only this log shows whether the control unit is defective or whether a plug 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 89170-50K10 work?

The process starts with reading out the fault memory, whose log you enclose. Then you disconnect the battery and remove the control unit; afterwards you create the repair order online and send in the packed unit. Airbag24 checks it on the test bench, replaces defective components, erases stored crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days. This period covers only the checking, repairing and testing, after which your own unit is returned.

The control unit is only removed once the fault memory has been read out and the battery disconnected, because the order is binding for safety reasons.

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 89170-50K10 get to Airbag24?

Shipping runs either via the parcel that you send yourself, or via a UPS collection booked for an extra charge. Airbag24 handles the return by UPS.

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