Airbag control unit with part number 89170-12M90

What does the airbag control unit 89170-12M90 do?

The airbag control unit 89170-12M90 is responsible for the restraint system (SRS) in Toyota. It evaluates the signals from the crash sensors and, in an accident, determines within milliseconds which airbags and seatbelt pretensioners are triggered.

It also checks the condition of the system continuously. As soon as a fault occurs, the unit reports it via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-12M90 fail?

The most common cause in the control unit 89170-12M90 is crash data stored after an accident, even if no airbag has triggered. An ordinary diagnostic tool cannot remove this data. Other causes include aged components, cold solder joints, moisture at plug connectors and voltage spikes.

The crash data sits in the control unit. Airbag24 clears it during the repair.

Beyond that, there are further causes related to the electronics themselves: components age, solder joints go cold, and wetness or corrosion attacks the plugs.

Voltage spikes, for example from a weak battery or a jump start, additionally stress the electronics.

How can you tell that the 89170-12M90 is defective?

The airbag warning light in the instrument cluster indicates a defect in the 89170-12M90 when it lights up permanently or intermittently. In that case, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

Typical signs on the vehicle are:

• Airbag warning light lights up intermittently or permanently
• Error message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

If you notice any of these signs, have the system checked promptly.

Which vehicles is the 89170-12M90 fitted in?

The control unit 89170-12M90 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles are listed below:

• Toyota Corolla E170 (2013-2018)

Comparing the part number on the label of the removed unit with this page ensures that you are removing the correct unit. Whether the control unit is defective or a cable is the cause is decided by the fault memory alone. Have it 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 89170-12M90 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit 89170-12M90. Next create the repair order online and send the unit in well packed.

Airbag24 inspects the unit on the test bench, replaces defective components, deletes the crash data and carries out a function test. Afterwards your own unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This period relates solely to inspection, repair and testing.

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 89170-12M90 get to Airbag24?

Either you send the control unit 89170-12M90 as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 returns the unit to you by UPS.

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