Airbag control unit with part number 89170-33R90

What does the airbag control unit 89170-33R90 do?

The airbag control unit 89170-33R90 is the central control unit of the restraint system (SRS) in Lexus. It processes the measurements from the crash sensors, decides on triggering the airbags and seatbelt pretensioners, and checks the system continuously. After an accident it stores crash data and locks itself.

The unit reports irregularities to the airbag warning light in the instrument cluster, so that you will notice them.

Why does the control unit 89170-33R90 fail?

Stored crash data is the most common cause of failure in the 89170-33R90, even if no airbag has deployed. A standard diagnostic tool cannot access this data; Airbag24 erases it during the repair.

Other possible causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start.

Since several causes are possible, only the fault memory provides clarity before a decision is made.

How can you tell that the 89170-33R90 is defective?

You can recognise a defect in the 89170-33R90 by the airbag warning light, which stays on continuously or intermittently, by an error message in the instrument cluster, by a lack of contact with the diagnostic tool, or by a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners could then fail to deploy.

The warning therefore comes immediately and not only at a later check. Arrange an examination promptly.

Which vehicles is the 89170-33R90 fitted in?

The control unit 89170-33R90 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The following list shows the vehicles stored for this part number.

• Lexus ES AXZH60 (from 2018)

First check the part number on the label of the unit to make sure it matches this page. Have the fault memory read out, because only it shows whether the control unit itself or a cable is the cause.

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 89170-33R90 work?

At Airbag24, processing of the 89170-33R90 usually takes 3–4 working days. This time covers only checking, repairing and testing.

Before shipping, read out the fault memory and attach the log. Then disconnect the battery, remove the control unit, and create the repair order online.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. 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 89170-33R90 get to Airbag24?

The 89170-33R90 reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, the unit is returned by UPS.

Pack it shock-proof and enclose the printed repair order.