Airbag control unit with part number 89170-02T70

What does the airbag control unit 89170-02T70 do?

The 89170-02T70 is responsible as the airbag control unit for the restraint system (SRS) of Toyota. It reads the signals of the crash sensors, decides in an accident within milliseconds on the triggering and monitors the system continuously while doing so.

If it detects a fault, it reports it via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself.

Why does the control unit 89170-02T70 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. In the 89170-02T70, aged electronic components, cold solder joints, moisture in plug connections and voltage spikes can also cause the failure.

Crash data cannot be deleted with a standard diagnostic tool; Airbag24 removes it as part of the repair. The other causes lie in the electronics, in the plugs or in the power supply.

Voltage spikes arise, for example, from a weak battery or when a jump start is connected. Corrosion on contacts additionally impairs signal transmission between the control unit and the vehicle.

How can you tell that the 89170-02T70 is defective?

The airbag warning light in the instrument cluster lights up constantly or only intermittently. In addition a fault message appears in the instrument cluster, the diagnostic tool receives no connection to the control unit, or the fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may possibly not deploy in an emergency. The warning light is therefore a clear indication that must be taken seriously.

Which vehicles is the 89170-02T70 fitted in?

The 89170-02T70 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The vehicles follow below as an overview.

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

Comparing the part number on the label with this page only ensures that you have the correct unit in front of you. Have the fault memory read out in advance, because it shows whether the control unit is defective or whether a plug or 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 89170-02T70 work?

First read out the fault memory and enclose the log. Then disconnect the battery and only afterwards remove the 89170-02T70. Finally, create the repair order online and pack the unit well for shipping.

Airbag24 checks the control unit on the test bench and replaces defective components. The stored crash data is then deleted, a function test follows and your own unit goes back to you. For checking, repairing and testing at Airbag24, 3–4 working days are usually planned.

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 89170-02T70 get to Airbag24?

The route to Airbag24 is either by parcel or via a UPS collection booked for an extra charge. The return journey is handled by Airbag24 via UPS.

Make sure the printed repair order lies in the parcel and that the control unit is packed shock-proof.