Airbag control unit with part number 89170-50M51

What does the airbag control unit 89170-50M51 do?

The 89170-50M51 is the central control unit of the SRS for Lexus. It processes the measured values of the crash sensors, decides in an impact within milliseconds on the triggering of airbags and seatbelt pretensioners, and checks the entire system during operation.

If a fault appears in the system, the unit records it and indicates it via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 89170-50M51 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed. Aged components, moisture and voltage spikes are also possible causes for the 89170-50M51.

Airbag24 removes the crash data during the repair. Further causes at a glance:

• aged 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 89170-50M51 is defective?

A defect on the 89170-50M51 shows itself when the airbag warning light in the instrument cluster lights up constantly or at times. A fault message in the instrument cluster or a fault memory that cannot be cleared also points to it.

In detail, a defect shows as follows:

• Airbag warning light lights up constantly or at times
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

If such a finding is present, airbags and seatbelt pretensioners may not deploy in an emergency, so a prompt check is advisable.

Which vehicles is the 89170-50M51 fitted in?

The list helps you compare it with your car. The 89170-50M51 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The vehicles for this number are listed here:

• Lexus LS XF50 (from 2018)

First compare the number on the label of the removed unit with this page, so that you have the right unit. Then have the fault memory read out beforehand, because only that shows whether the control unit is defective or 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 89170-50M51 work?

For the 89170-50M51, first have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create the repair order online and send the unit in. Processing at Airbag24 usually takes 3–4 working days.

The unit is checked on the test bench at Airbag24, defective components are repaired, stored crash data is erased and a function test is carried out. Afterwards the 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 89170-50M51 get to Airbag24?

You send the 89170-50M51 as a parcel or book a UPS collection for an extra charge. Returning it after the repair is done by UPS.

The printed repair order goes in the parcel, and the unit is packed shockproof.