Airbag control unit with part number 89170-12A90

What does the airbag control unit 89170-12A90 do?

As the airbag control unit, the 89170-12A90 forms the control centre of the SRS system in Toyota vehicles. It reads the crash sensors, decides within milliseconds in an impact which airbags and seatbelt pretensioners are triggered, and checks the entire system in the background. It indicates irregularities via the airbag warning light.

Monitoring runs throughout the entire journey. Sensors, wiring and output stages are checked in the process.

An accident causes the unit to store crash data and then be locked.

Why does the control unit 89170-12A90 fail?

Stored crash data is the most common cause, even when no airbag has deployed. A diagnostic tool does not delete it. Other causes include aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes, for example when the battery is weak or when starting with external power.

Crash data is created when the unit has registered an event. It cannot be removed with a conventional diagnostic tool. Airbag24 deletes it as part of the repair.

The remaining causes concern the ageing of the electronics, moisture in plug connections and voltage spikes in the vehicle electrical system. They occur regardless of an accident.

How can you tell that the 89170-12A90 is defective?

The airbag warning light in the instrument cluster lights up constantly or only intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The warning light reports the finding itself, and that is exactly what it is for. Depending on the cause, the indicator appears immediately or only intermittently.

With such a defect, airbags and seatbelt pretensioners may not deploy in an emergency.

Which vehicles is the 89170-12A90 fitted in?

The 89170-12A90 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles are listed one below the other in the following section:

• Toyota Corolla E170 (2013-2018)

First compare the part number on the label of the removed unit with this page, so that you have the correct unit. Also have the fault memory read out. Only this log shows whether the control unit itself is defective or whether a plug or cable is the cause.

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 89170-12A90 work?

Have the fault memory read out first and enclose the log with the unit. Then disconnect the battery and only afterwards remove the 89170-12A90. Create a repair order online and send the unit in, well packed.

The sequence serves safety and must be followed.

At Airbag24, the unit is examined on the test bench, defective components are replaced, crash data is deleted and a function test is carried out. Afterwards your own unit comes back 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 89170-12A90 get to Airbag24?

You send the unit to Airbag24 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

The printed repair order goes into the parcel. Pack the unit shock-proof.