Airbag control unit with part number 89170-50M70

What does the airbag control unit 89170-50M70 do?

The airbag control unit 89170-50M70 evaluates the crash sensors within the restraint system (SRS) of Lexus. It checks their signals, selects the appropriate airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously. Faults appear via the airbag warning light.

After an accident it stores crash data and locks itself.

In everyday use it stays unobtrusive, but the monitoring runs without interruption.

Why does the control unit 89170-50M70 fail?

The most common cause is crash data from an accident, which is stored even if no airbag has deployed; an ordinary diagnostic tool does not make it disappear. Further causes lie in aged components, cold solder joints, moisture at the contacts and voltage spikes.

Airbag24 erases the crash data during the repair. Nothing can be seen from the outside.

Further causes in detail:

• ageing of the electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes from a weak battery or a jump start

How can you tell that the 89170-50M70 is defective?

You recognise a defect by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared.

If you notice one of these signs, have it checked. In an emergency the airbags and seatbelt pretensioners may then not deploy. Only the read-out fault memory shows whether the control unit itself is affected.

Which vehicles is the 89170-50M70 fitted in?

The control unit 89170-50M70 is fitted in these vehicles: Lexus LS XF50 (from 2018). Before removing anything, check whether your car is on this list.

The following vehicles are on record for this number:

• Lexus LS XF50 (from 2018)

Compare the number on the label of the removed unit with this page; you only know that you have the right unit. Also have the fault memory read out, because only this log 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 89170-50M70 work?

First have the fault memory read out and enclose the log with the unit; then disconnect the battery and remove the control unit. Afterwards create a repair order online and send in the unit well packed. Airbag24 checks it on the test bench, puts the components right, erases the crash data and tests the function before your own unit comes back.

The order protects you during removal. Processing at Airbag24 usually takes 3–4 working days, counted only for checking, repairing and testing.

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 89170-50M70 get to Airbag24?

You can send the unit as a parcel or book a UPS collection for an extra charge. After the repair, the unit reaches you again by UPS.

Enclose the printed repair order with the parcel and pack the unit so that it arrives shockproof.