Airbag control unit with part number 89170-02S90

What does the airbag control unit 89170-02S90 do?

The 89170-02S90 is an airbag control unit and forms the switching centre of the SRS system for Toyota. It processes signals from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners in an accident within a few milliseconds.

In operation, the control unit checks its surroundings continuously. It shows detected faults via the airbag warning light, so drivers can read the state of the system.

After an accident, the unit stores crash data and locks itself. Only a repair releases this lock.

Why does the control unit 89170-02S90 fail?

Crash data from an accident is the most common cause, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

Crash data arises when the unit records an accident event. An ordinary diagnostic tool cannot remove it. The problem also appears when no airbag has deployed in the vehicle.

The other causes are wear and environmental influences. Components age, solder joints can become weak points, and moisture or corrosion attack plug contacts.

Electrical stresses also play a part. A weak battery or a jump start can cause voltage spikes that attack the components.

How can you tell that the 89170-02S90 is defective?

An airbag warning light in the instrument cluster that stays on constantly or only intermittently is the clearest sign. It is accompanied by fault messages, which a diagnostic tool can also read out.

The following signs point to a defect:

• The airbag warning light in the instrument cluster stays on permanently or flashes intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool cannot establish a connection to the control unit.
• The fault memory cannot be cleared.

In that case there is a risk that the airbags and seatbelt pretensioners will not deploy in an emergency. For this reason, such a signal deserves a prompt check.

Which vehicles is the 89170-02S90 fitted in?

The unit with the part number 89170-02S90 is used in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022). You can see from this assignment whether it suits your car.

Here follows the list of vehicles that belong to this part number.

• Toyota Corolla E210 (2018-2022)
• Toyota Corolla E210 Facelift (from 2022)

The part number, which you can compare with this page, is printed on the label of the unit. This is how you make sure that you have the correct control unit in front of you. Whether it is defective becomes apparent only from the fault memory, which you have read out beforehand, because then it shows whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02N50, 89170-02T10, 89170-02W80, 89170-0F150.

How does the repair of the 89170-02S90 work?

First have the fault memory read out and enclose the log with the unit, then disconnect the battery and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days, during which the unit is checked, repaired and tested.

Your steps follow this fixed order. Afterwards, create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench. Defective components are replaced, stored crash data is erased and a function test is completed. Afterwards your own 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 89170-02S90 get to Airbag24?

Either you send the control unit 89170-02S90 to Airbag24 as a parcel, or for an extra charge you book a UPS collection. Return shipment after the repair is made by UPS.

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