Airbag control unit with part number 89170-02T80

What does the airbag control unit 89170-02T80 do?

The airbag control unit 89170-02T80 controls the restraint system (SRS) at Toyota. It evaluates sensor data and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

It monitors the entire system continuously. It displays faults via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-02T80 fail?

Stored crash data is the most common cause, even when no airbag was triggered. This data cannot be deleted with a usual diagnostic tool. Further causes are aged components, cold solder joints, moisture and corrosion, as well as voltage spikes.

It remains in the memory until it is specifically deleted. It therefore stays in place even if the fault no longer occurs otherwise.

The other causes lie in the electronics. Over time, components age, solder joints can go cold, and moisture or corrosion on plugs disturb the contact. Voltage spikes arise, for example, from a weak battery or jump-starting.

How can you tell that the 89170-02T80 is defective?

A defect on the 89170-02T80 shows up through the warning light, fault messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

• The airbag warning light lights up permanently or intermittently.
• The instrument cluster shows a fault message.
• The diagnostic tool receives no connection to the control unit.
• The fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The light shows the defect itself as soon as the system detects it.

Which vehicles is the 89170-02T80 fitted in?

The 89170-02T80 was installed at Toyota in the following vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The vehicles are listed individually below:

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

If the part number on the label of the removed unit matches this page, it is the right unit. It says nothing about the condition. So have the fault memory read out beforehand, because only this log shows whether the control unit is defective or 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 89170-02T80 work?

You have the fault memory read out and enclose the log. Then you disconnect the battery and only then remove the control unit. Online, you then create the repair order and send the well-packed unit.

Airbag24 checks the unit on the test bench. Defective components are replaced, the crash data is deleted, and a function test follows.

Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit returns 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 89170-02T80 get to Airbag24?

You send the control unit to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

The printed repair order is enclosed in the parcel, and the unit is packed shock-proof.