Airbag control unit with part number 89170-02E20

What does the airbag control unit 89170-02E20 do?

The airbag control unit 89170-02E20 is the central control unit of the SRS system at Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners fire, and checks the system continuously.

Faults appear via the airbag warning light in the instrument cluster, so you can see early that something in the system is wrong.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-02E20 fail?

The most common cause is the crash data stored after an accident, even if no airbag has fired. Further causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or jump-starting.

A commercially available diagnostic tool cannot remove this data; Airbag24 handles it as part of the repair.

The remaining causes relate to connections and components that age or come under electrical stress over the years. Plug contacts deserve particular attention, because moisture attacks metal.

How can you tell that the 89170-02E20 is defective?

The defect shows on the airbag warning light in the instrument cluster, which lights constantly or only intermittently, and on an error message in the instrument cluster. In addition the diagnostic tool finds no connection to the control unit, and the fault memory remains.

In this condition, airbags and seatbelt pretensioners may possibly not deploy in an emergency. The light is therefore no minor matter, but a finding that you should have clarified promptly.

Which vehicles is the 89170-02E20 fitted in?

The airbag control unit 89170-02E20 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

Below follows the overview of the vehicles recorded for this number.

• Toyota Corolla E170 (2013-2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit in front of you. Whether the control unit is actually defective or whether a plug or cable is the cause only the fault memory shows. Therefore have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-02C60, 89170-02C70, 89170-02C80, 89170-02C90, 89170-12280, 89170-12340.

How does the repair of the 89170-02E20 work?

First have the fault memory read out, attach the log and then disconnect the battery; only then remove the control unit. Afterwards create a repair order online and send the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test.

Afterwards the unit goes back to you. The processing time at Airbag24 is usually 3–4 working days, and this period applies only to checking, repairing and testing there.

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 89170-02E20 get to Airbag24?

You send the unit as a parcel or arrange a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.