Airbag control unit with part number 89170-02T90

What does the airbag control unit 89170-02T90 do?

The airbag control unit 89170-02T90 controls the SRS system of Toyota. It checks the crash sensors, selects the appropriate airbags and seatbelt pretensioners in an accident and triggers them. It reports faults via the airbag warning light in the vehicle.

The signals are evaluated continuously and within fractions of a second.

After an accident a trace remains in the unit, because it stores crash data and locks itself.

Why does the control unit 89170-02T90 fail?

Stored crash data is the most common cause of failure on the 89170-02T90, even if no airbag was triggered; a normal diagnostic tool does not delete it. In addition, aged electronics, cold solder joints, moisture and corrosion on plugs, and voltage spikes can cause the failure.

The unit stores this data itself, and Airbag24 removes it as part of the repair.

Cold solder joints, aged electronics and corrosion on plugs impair the function gradually.

How can you tell that the 89170-02T90 is defective?

On the 89170-02T90 a defect first becomes noticeable through the airbag warning light, which lights up permanently or intermittently in the instrument cluster. In addition, the instrument cluster shows an error message, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. In an emergency, it can therefore happen that airbags and seatbelt pretensioners do not trigger.

The warning light is the clearest sign. Without reading out the fault memory, however, you will not know the cause.

The light reports the defect itself, so it does not have to surface only during a later examination.

Which vehicles is the 89170-02T90 fitted in?

The assignment lists the Toyota vehicles for which this unit is intended. The 89170-02T90 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

These vehicles are recorded here:

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

Beforehand, compare the part number on the label of the removed unit with this page; it only confirms the correct unit. Also have the fault memory read out before you remove anything. Only then does it become clear whether the control unit is defective or a plug or cable causes the fault.

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 89170-02T90 work?

Have the fault memory read out first; the log goes with the unit. Then disconnect the battery and only afterwards remove the 89170-02T90. Create the repair order online and pack the unit well before sending it in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit is checked, defective components are replaced, the crash data is deleted, and a function test is carried out. Then 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 89170-02T90 get to Airbag24?

You send the unit in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Enclose the printed repair order and pack the unit shock-proof.