Airbag control unit with part number 89170-06B91

What does the airbag control unit 89170-06B91 do?

The 89170-06B91 is the airbag control unit that controls the restraint system (SRS) at Lexus. It detects an accident through the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered.

Even during normal operation, the unit monitors the system electronics. It indicates faults via the airbag warning light in the instrument cluster.

An accident leaves crash data in the unit, and the control unit is locked afterwards.

Why does the control unit 89170-06B91 fail?

The most common reason for the 89170-06B91 is crash data that remains stored after an accident, even if no airbag has deployed. Added to this are aged electronics, cold solder joints, moisture on plugs and voltage spikes.

Crash data of this kind cannot be removed with a standard diagnostic tool, which is why it remains when the fault memory is read.

The other causes relate to age and environment: components wear out, connections corrode, and weak batteries generate voltage spikes.

How can you tell that the 89170-06B91 is defective?

A defect on the 89170-06B91 becomes noticeable when the airbag warning light lights up permanently or intermittently. In addition, there may be a fault message in the instrument cluster, a missing connection to the diagnostic tool, or a fault memory that cannot be erased.

In such a case, airbags and seatbelt pretensioners may fail to deploy in an emergency. Have the finding clarified immediately.

Which vehicles is the 89170-06B91 fitted in?

Here you can see which vehicles the control unit is intended for. The control unit 89170-06B91 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The vehicles in this list are known to us for this part number:

• Lexus ES AXZH60 (from 2018)

First compare the part number on the removed unit with this page, because that only ensures you have the correct unit. Have the fault memory read out beforehand. Only the result shows whether the control unit itself is defective or a plug or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-06B91 work?

First read out the fault memory, disconnect the battery and only then remove the 89170-06B91. Next, create a repair order online and send in the well-packed unit. Airbag24 usually needs 3–4 working days for testing, repair and function test, and it erases the crash data.

To do this, Airbag24 replaces defective components. 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 89170-06B91 get to Airbag24?

You can send the 89170-06B91 control unit to us as a parcel or book a UPS collection for an extra charge. After the repair is complete, Airbag24 sends it back by UPS.

Place the printed repair order in the box and protect the unit against knocks.