Airbag control unit with part number 89170-33D80

What does the airbag control unit 89170-33D80 do?

Control unit 89170-33D80 is the central control unit of the restraint system (SRS) for Lexus. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners trigger, and monitors the system continuously. If it detects a fault, it indicates this via the airbag warning light.

During operation the electronics work continuously and compare their measured values with the manufacturer's specifications. Evaluation therefore does not only begin at impact.

After an accident the control unit records crash data and locks itself.

Why does the control unit 89170-33D80 fail?

Most often the cause is crash data left in the memory after an accident, even if no airbag has triggered. A normal diagnostic tool cannot erase it; Airbag24 removes it during the repair. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data is created by the event itself and does not automatically mean that a component has been destroyed. Even an impact without triggering can leave such data behind. Reading out with a diagnostic tool does not remove it.

The other causes act over time and through the environment. Ageing and moisture attack contacts and solder joints, while voltage fluctuations stress the components inside the unit.

How can you tell that the 89170-33D80 is defective?

A defect shows itself as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message may accompany it in the instrument cluster, and the fault memory cannot be cleared.

In this case a diagnostic tool gets no connection to the control unit. In an emergency, airbags and seatbelt pretensioners may fail to trigger, so have the warning checked.

Which vehicles is the 89170-33D80 fitted in?

The assignment is based on the stored vehicle data and may vary depending on equipment. The 89170-33D80 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The list shows the vehicles for which we have stored this part number.

• Lexus ES AXZH60 (from 2018)

Compare the number on the label of the removed unit with this page, and you will see that you have the right unit. Also have the fault memory read out beforehand. Only this result shows whether the control unit itself is the cause or a plug or cable.

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 89170-33D80 work?

First read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit. Afterwards create a repair order online and send in the well-packed unit. Airbag24 needs 3–4 working days for checking, repairing and testing.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards the 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 89170-33D80 get to Airbag24?

Send the unit in as a parcel; alternatively, UPS collects it for an extra charge. Airbag24 returns it by UPS after the repair.

Put the printed repair order in the parcel, and pack the unit shock-resistant.