Airbag control unit with part number 89170-33B70

What does the airbag control unit 89170-33B70 do?

At Lexus the control unit 89170-33B70 takes over management of the airbag system (SRS). It processes the measurements from the crash sensors and, in a fraction of a second during an accident, determines which airbags and seatbelt pretensioners are triggered. It also checks the system continuously and indicates faults via the airbag warning light.

The check covers the sensors, the wiring and the activation of the triggers.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-33B70 fail?

The most common cause in the 89170-33B70 is crash data stored in the control unit after an accident, even if no airbag has deployed. Diagnostic tools on the market cannot erase this data. Other possible causes are ageing electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The data is therefore created even when no airbag has opened.

The other causes lie inside the electronics or at the contacts. Moisture and corrosion attack the plug connections, and cold solder joints can trigger a fault. Airbag24 erases the crash data during the repair.

How can you tell that the 89170-33B70 is defective?

The airbag warning light in the instrument cluster lights up on the 89170-33B70 permanently or intermittently, a fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the control unit. In addition, the fault memory cannot be erased.

The warning light is the most important hint the vehicle gives. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Which vehicles is the 89170-33B70 fitted in?

The 89170-33B70 is fitted in: Lexus ES AXZH60 (from 2018).

The list states the vehicles to which the part number fits.

• Lexus ES AXZH60 (from 2018)

Compare the part number on the label with this page. That only confirms that it is the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a cable is behind it.

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 89170-33B70 work?

For the repair of the 89170-33B70, have the fault memory read out, enclose the log and disconnect the battery; only then remove the control unit. Then create the repair order online and send the well-packed unit. Airbag24 checks it, repairs defective components, erases the crash data and carries out a function test, which as a rule takes 3–4 working days.

The sequence must be observed for safety reasons.

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 89170-33B70 get to Airbag24?

A parcel is sufficient, or you book a UPS collection for the control unit 89170-33B70 for an extra charge. Airbag24 sends the unit back to you by UPS after the repair. The printed repair order is enclosed in the parcel, and the packaging must be shock-resistant.

Choose a sturdy parcel and pad it so nothing shifts during transport.