Airbag control unit with part number 89170-33S90

What does the airbag control unit 89170-33S90 do?

The airbag control unit 89170-33S90 manages the restraint system in vehicles from Lexus. It evaluates the crash sensors, determines in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It indicates a fault via the airbag warning light.

After a crash, it stores crash data and locks itself.

Triggering in fractions of a second is only possible because the unit evaluates the sensor signals continuously.

Why does the control unit 89170-33S90 fail?

The most common cause is an entry of crash data from a crash that the control unit 89170-33S90 has stored, even without an airbag deploying. This data cannot be erased with a normal diagnostic tool. In addition come aged components, cold solder joints, moisture, corrosion and voltage spikes.

An airbag does not have to have deployed for this entry.

Electronic components wear out over time, solder joints can go cold, and plug connections suffer from moisture and corrosion.

How can you tell that the 89170-33S90 is defective?

The airbag warning light in the instrument cluster lights up permanently or only intermittently as soon as something is wrong with the unit 89170-33S90. The diagnostic tool does not reach the control unit, and the fault memory cannot be cleared.

An error message also appears in the instrument cluster. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

In that case, have the system checked promptly.

Which vehicles is the 89170-33S90 fitted in?

The airbag control unit 89170-33S90 is fitted in these vehicles: Lexus ES AXZH60 (from 2018). To find out whether your vehicle is affected, compare the list first.

The list contains the vehicles for which Airbag24 holds this part number.

• Lexus ES AXZH60 (from 2018)

A comparison of the part number on the unit with this page ensures that it is the correct unit. For the cause, however, only the fault memory decides, which you should have read out before removal.

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 89170-33S90 work?

The process begins with reading out the fault memory, and the log comes with the unit. Then you disconnect the battery; only then remove the control unit 89170-33S90. Then create the repair order online and send the well-packed unit.

At the test bench, Airbag24 checks the unit it receives, repairs defects in components, erases the crash data and tests the function. Then your own unit comes back to you.

For the work at Airbag24, namely inspection, repair and testing, 3–4 working days are scheduled.

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 89170-33S90 get to Airbag24?

The control unit 89170-33S90 reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return journey is also handled by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-resistant.