Airbag control unit with part number 89170-12D90

What does the airbag control unit 89170-12D90 do?

The airbag control unit 89170-12D90 is the central control unit of the restraint system (SRS) at Toyota. It evaluates the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults appear via the airbag warning light.

In normal operation the unit goes unnoticed. It only intervenes when the sensors register something.

An accident leaves crash data in the memory, and the unit then locks itself. The repair is the only way to lift this lock.

Why does the control unit 89170-12D90 fail?

In the control unit 89170-12D90, the most common cause is crash data from memory, even if no airbag has deployed. A normal diagnostic tool cannot remove it. Aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes are also possible causes.

A normal diagnostic tool cannot erase these entries. They disappear only when Airbag24 deletes them as part of the repair.

Remaining causes are aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes from a weak battery or jump starting. The repair also checks these points.

How can you tell that the 89170-12D90 is defective?

A defect on the control unit 89170-12D90 shows up as the airbag warning light in the instrument cluster, which stays on constantly or intermittently, and as an error message in the instrument cluster. The diagnostic tool then finds no connection to the control unit, and the fault memory cannot be erased.

While the light is on, airbags and seatbelt pretensioners may fail to trigger in an emergency. That is not a minor matter.

Therefore take this indicator seriously and have the fault memory read out promptly.

Which vehicles is the 89170-12D90 fitted in?

The control unit 89170-12D90 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The list shows which models are recorded for this part number.

• Toyota Corolla E170 (2013-2018)

If the part number on the label of the removed unit matches this page, you have found the right unit. Whether it is defective, however, only the fault memory will show, and it must be 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 89170-12D90 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit 89170-12D90. Next, create the repair order online and send the unit in well packed.

Afterwards you get your own unit back, once Airbag24 has checked it, replaced defective components, removed the crash data and carried out a function test.

Processing at Airbag24 usually takes 3–4 working days. This time applies only to checking, repairing 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 89170-12D90 get to Airbag24?

You can send the control unit 89170-12D90 in as a parcel. A UPS collection, booked for an extra charge, is also available for shipping.

Include the printed repair order in the parcel. The unit must be packed shock-proof.