Airbag control unit with part number 89170-50K80

What does the airbag control unit 89170-50K80 do?

The airbag control unit 89170-50K80 is the control unit of the restraint system (SRS) in vehicles from Lexus. It checks the crash sensors and, as soon as an impact requires it, decides within milliseconds whether airbags and seatbelt pretensioners are triggered.

It also monitors the components continuously and shows faults on the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-50K80 fail?

The most common cause: crash data stored after an accident, even without a triggered airbag. Other causes include ageing electronic components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data remains stored in the unit, and a standard diagnostic tool cannot erase it. Airbag24 erases it during the repair.

The other causes at a glance:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump starting

How can you tell that the 89170-50K80 is defective?

The airbag warning light in the instrument cluster signals a defect when it lights up permanently or intermittently. A fault message may also appear, or the diagnostic tool cannot reach the control unit. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

A fault memory that cannot be cleared and a diagnostic tool without connection are further signs. The warning light gives the hint itself, which is why you should look at the instrument cluster on every journey.

Which vehicles is the 89170-50K80 fitted in?

The control unit 89170-50K80 is found in the following vehicle: Lexus LS XF50 (from 2018).

Here is the overview:

• Lexus LS XF50 (from 2018)

A comparison of the part number on the unit with this page shows whether you have the right control unit. Only the fault memory shows whether the control unit is defective or whether a plug or cable is the cause. Have it read out before removal.

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 89170-50K80 work?

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

This sequence is mandatory for your safety, which is why reading out comes before removal.

Processing at Airbag24, i.e. checking, repair and function test, usually takes 3–4 working days. Afterwards your own unit goes back 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 89170-50K80 get to Airbag24?

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

Place the printed repair order in the parcel and pack the control unit shock-proof.