Airbag control unit with part number 89170-33N30

What does the airbag control unit 89170-33N30 do?

The airbag control unit 89170-33N30 controls the SRS restraint system of Lexus. It checks the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the system continuously for faults.

It shows detected faults via the airbag warning light on the instrument cluster.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-33N30 fail?

The most common cause in the 89170-33N30 is crash data stored after an accident, even without a triggered airbag; a normal diagnostic tool cannot remove them. Ageing components, cold solder joints, moisture at connectors and voltage spikes are also possible.

The crash data record what happened during the event and remain in the memory of the control unit afterwards.

Ageing electronics lose reliability over time. Solder joints can stay cold or break, and contacts suffer from wet and corrosion.

Voltage spikes arise, for example, from a weak battery or from jump-starting, and can impair the electronics.

How can you tell that the 89170-33N30 is defective?

A defect in the 89170-33N30 manifests itself in the airbag warning light, which lights up permanently or intermittently. In addition, there are error messages on the instrument cluster, a failure of the diagnostic tool to connect, and a fault memory that cannot be cleared.

The airbag warning light is the most direct indication. It becomes active as soon as the control unit registers a fault and shows it to the driver, without a workshop device needing to be connected.

If the control unit is defective, the airbags and seatbelt pretensioners may not trigger in an emergency. The warning light must therefore be taken seriously.

Which vehicles is the 89170-33N30 fitted in?

The airbag control unit 89170-33N30 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The vehicles for this part number are listed below.

• Lexus ES AXZH60 (from 2018)

Two pieces of advice: compare the part number on the label of the removed unit with this page, because this only confirms that it is the correct unit. Also have the fault memory read out, because only the result shows whether the control unit is defective or whether a connector 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 89170-33N30 work?

First, have the fault memory read out with the log, then disconnect the battery and remove the 89170-33N30. Afterwards, create the repair order online and send the unit in well packed. For checking, repairing and testing at Airbag24, allow 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components. Airbag24 then erases the stored crash data and carries out a function test.

The final step is the return of your own unit. 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 89170-33N30 get to Airbag24?

You send the control unit 89170-33N30 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

The printed repair order belongs in the parcel, and the unit must be packed shock-proof.