Airbag control unit with part number 89170-02T81

What does the airbag control unit 89170-02T81 do?

The airbag control unit 89170-02T81 controls the restraint system (SRS) in Toyota vehicles. It reads the crash sensors, determines in an accident which airbags and seatbelt pretensioners fire, and checks the system continuously.

It shows faults with the airbag warning light in the instrument cluster. After an accident the unit stores crash data and locks itself.

Without the control unit, the sensors and airbags would not be connected to each other.

Why does the control unit 89170-02T81 fail?

In the 89170-02T81, stored crash data is the most common cause, even if no airbag fired in the accident, and a normal diagnostic tool cannot erase it. Further triggers are aged electronics, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

Airbag24 erases crash data during the repair. You do not have to attempt this yourself beforehand.

Electronics can deteriorate, solder joints can become brittle, and moisture attacks the contacts. Voltage spikes, for example from a weak battery or a jump-start, place additional strain on the circuits.

How can you tell that the 89170-02T81 is defective?

A defect in the 89170-02T81 becomes recognisable when the airbag warning light in the instrument cluster lights up permanently or intermittently. An error message, a lost contact with the diagnostic tool or a fault memory that cannot be cleared also indicate a problem.

These signs occur:

• warning light in the instrument cluster is on
• error message appears in the instrument cluster
• diagnostic tool gets no connection
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then not trigger. Please have the fault checked promptly.

Which vehicles is the 89170-02T81 fitted in?

The control unit 89170-02T81 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The vehicle assignment in detail is as follows:

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

Compare the part number on the label of the removed unit with this page, so you can be sure it is the right unit. Also have the fault memory read out beforehand. Only that log shows whether the control unit is defective or 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 89170-02T81 work?

For the 89170-02T81, first read out the fault memory and enclose the log. Then disconnect the battery and only then remove the control unit. Create a repair order online and send in the well-packed unit, after which Airbag24 inspects it, replaces defective components, erases the crash data and performs a function test.

This sequence is mandatory for safety reasons and must not be reversed.

Airbag24 typically needs 3–4 working days for processing. Your own unit is then returned 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 89170-02T81 get to Airbag24?

You send the 89170-02T81 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Pack the printed repair order into the box and cushion the unit shock-proof.