Airbag control unit with part number 89170-50M22

What does the airbag control unit 89170-50M22 do?

The airbag control unit 89170-50M22 is the central control unit of the restraint system (SRS) of Lexus. It evaluates the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

It reports faults via the airbag warning light, so you learn that something is wrong.

A failure therefore does not affect a single function, but the protective effect in an emergency.

Why does the control unit 89170-50M22 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or jump-starting. During repair, Airbag24 erases the crash data.

The crash data is a record of the event and not a diagnosis of the component. It shows that an event was registered, but not which part of the unit is responsible.

Moisture and corrosion attack the plug connectors, and voltage spikes stress the electronics. Aged components and solder joints change over time.

These factors can also occur together. The fault memory helps narrow things down, because it shows which message the control unit itself has stored.

How can you tell that the 89170-50M22 is defective?

The airbag warning light in the instrument cluster indicates a defect when it lights up permanently or intermittently. In addition there is an error message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not deploy.

If the light only flickers now and then, that is no reason for relief.

A missing connection indicates that the control unit no longer responds. The check is therefore only possible to a limited extent until the fault memory has been read out.

Which vehicles is the 89170-50M22 fitted in?

The airbag control unit 89170-50M22 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The following vehicles are assigned to this part number:

• Lexus LS XF50 (from 2018)

First, compare the part number on the label of the removed unit with this page. This only confirms that you have the right unit. Second, have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-50K10, 89170-50K11, 89170-50K30, 89170-50K31, 89170-50K40, 89170-50K41.

How does the repair of the 89170-50M22 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

The sequence is binding for your safety, and the log is an essential part of it.

At Airbag24, the unit is checked on the test bench, defective components are replaced and the stored crash data is erased. A function test follows before 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 89170-50M22 get to Airbag24?

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

Packed shock-resistant and enclosed with the printed repair order, the unit is on its way.