Airbag control unit with part number 89170-50L50

What does the airbag control unit 89170-50L50 do?

The airbag control unit 89170-50L50 controls the restraint system (SRS) in vehicles from Lexus. It reads the crash sensors, determines within fractions of a second which airbags and seatbelt pretensioners trigger, and checks the function continuously. After an accident it stores crash data and locks itself.

The unit detects faults itself and reports them via the airbag warning light.

The crash data are part of the memory in the unit.

Why does the control unit 89170-50L50 fail?

The most common cause is crash data from an earlier accident, even if no airbag triggered. Ordinary diagnostic tools cannot delete it. Other causes are aged components, cold solder joints, corrosion at plug connections, moisture and voltage spikes.

Crash data cause most failures, because the unit stores them even when an accident happened without any airbag triggering.

Other influences also play a role:

• components that age over time
• cold solder joints
• corrosion and moisture at plug connections
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 89170-50L50 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition a fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the 89170-50L50. If the fault memory cannot be cleared, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

A light that keeps coming on is a sign that something in the restraint system is wrong.

If no connection can be made, that is a warning sign in its own right.

Which vehicles is the 89170-50L50 fitted in?

The control unit 89170-50L50 is fitted in these vehicles: Lexus LS XF50 (from 2018). To see whether it fits your car, search for your vehicle in the list.

The vehicles in detail:

• Lexus LS XF50 (from 2018)

Comparing the part number on the label of the removed unit with this page only ensures it is the correct unit. Have the fault memory read out before removal, because only the 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 89170-50L50 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and send the unit off well packed. At Airbag24, testing, repair and function test usually take 3–4 working days.

The sequence of steps serves safety, which is why you should keep to it strictly.

At Airbag24 the unit is checked on the test bench. Defective components are replaced, stored crash data is erased, and a function test follows. Your own unit then 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 89170-50L50 get to Airbag24?

You can send the control unit 89170-50L50 as a parcel or book a UPS collection for an extra charge. The return after repair is made by UPS.

Put the printed repair order into the parcel and pack the control unit shockproof.