Airbag control unit with part number 89170-12F00

What does the airbag control unit 89170-12F00 do?

In the Toyota, the airbag control unit 89170-12F00 processes the signals of the crash sensors. In an accident it decides within milliseconds which airbags and seatbelt pretensioners are triggered.

Outside an accident it checks the entire restraint system (SRS) continuously. If it detects an irregularity, it reports it via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and is locked afterwards.

Why does the control unit 89170-12F00 fail?

Most often the cause is crash data that remained in the memory after an accident, even if no airbag has deployed. Ageing components, moisture and voltage spikes also play a role.

An ordinary diagnostic tool cannot remove these entries. They originate from the event itself and remain even if the vehicle continues to drive normally afterwards.

The other causes are of a general nature: electronics age, solder joints can become faulty, moisture and corrosion attack plug connections, and voltage spikes occur, for example, with a weak battery or jump-starting.

How can you tell that the 89170-12F00 is defective?

A defect is indicated by the airbag warning light, which stays on permanently or intermittently. The fault may also show itself through other features.

• Fault message in the instrument cluster
• Diagnostic tool cannot establish a connection to the control unit
• Fault memory cannot be cleared

While the defect exists, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency. Take the warning light seriously, even if the car runs normally in everyday use.

Which vehicles is the 89170-12F00 fitted in?

The 89170-12F00 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The list gives an overview of the vehicles assigned to this part number:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit. Have the fault memory read out beforehand: only this log shows whether the control unit itself is affected or whether a plug or a 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 89170-12F00 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit. After that, create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, defective components are renewed, the crash data is erased and a function test is carried out. Checking, repairing and testing there usually takes 3–4 working days. Afterwards your own unit goes back to you.

The order of the steps is prescribed for safety reasons. 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 89170-12F00 get to Airbag24?

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

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