Airbag control unit with part number 89170-12D20

What does the airbag control unit 89170-12D20 do?

The airbag control unit 89170-12D20 manages the SRS restraint system of Toyota. It checks the signals from the crash sensors and, in the event of an accident, triggers the appropriate airbags and seatbelt pretensioners in a targeted way. It also monitors the entire system and reports faults via the airbag warning light.

The monitoring runs in the background, without you noticing anything.

If an accident is registered, the unit writes crash data and locks itself.

Why does the control unit 89170-12D20 fail?

The most common cause is crash data that remained in the memory after a collision without an airbag deploying. Ageing electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes are also possible causes.

Simple diagnostic tools cannot erase this data. Airbag24 clears it as part of the repair.

The other causes relate to the components themselves, the solder joints on the circuit board and the power supply. Which of these applies becomes clear during the examination.

Voltage spikes occur, for example, when starting with a jump-start or when the battery is weak.

How can you tell that the 89170-12D20 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. A fault message also appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared.

In that case, the airbags and seatbelt pretensioners may not deploy in an emergency.

You should have such signs checked promptly.

Which vehicles is the 89170-12D20 fitted in?

The control unit 89170-12D20 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

This list shows the vehicles in which the unit operates:

• Toyota Corolla E170 (2013-2018)

Comparing the label with this page is purely a fit check and reveals nothing about the cause. Whether the control unit is defective or a plug or cable is at fault is shown only by the fault memory, which you should have read out before removal.

For the same vehicles, we also repair control units with the part numbers 89170-02C70, 89170-12180, 89170-12G10, 89170-12N50.

How does the repair of the 89170-12D20 work?

First have the fault memory read out and enclose the log. Then disconnect the battery before removing the control unit. Afterwards create the repair order online and send the unit in, well packed.

Airbag24 checks the control unit on the test bench, replaces defective components, clears the stored crash data and carries out a function test. Testing, repair and checking at Airbag24 usually take 3–4 working days. 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 89170-12D20 get to Airbag24?

You can send the unit as a parcel or, for an extra charge, book a UPS collection. Once the work is complete, Airbag24 sends the unit back to your address by UPS. Enclose a printed repair order with the parcel.

Make sure the packaging is shock-resistant, so the unit arrives undamaged.