Airbag control unit with part number 89170-12N00

What does the airbag control unit 89170-12N00 do?

The airbag control unit 89170-12N00 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation the unit monitors the entire system. If it detects a fault, it shows this via the airbag warning light in the instrument cluster, so that you recognise the condition early.

After an accident the unit stores crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 89170-12N00 fail?

Stored crash data is the most common cause with the 89170-12N00, even if no airbag has triggered. A normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture at plug connections and voltage spikes are also possible.

Airbag24 erases the crash data during the repair, so you do not have to do anything yourself.

The other causes lie in ageing and environmental influences. Electronic components change over time, solder joints can go cold, and moisture or corrosion disturbs the contact at the connectors. Voltage spikes, for example from a weak battery or a jump start, also stress the unit.

How can you tell that the 89170-12N00 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and in addition an error message appears in the instrument cluster. The diagnostic tool has no connection to the control unit 89170-12N00, and the fault memory cannot be cleared.

These signs indicate a fault that should be clarified. The warning light in particular shows you the condition without your having to measure anything.

In an emergency, airbags and seatbelt pretensioners may then not trigger. Therefore have the condition clarified promptly.

Which vehicles is the 89170-12N00 fitted in?

The airbag control unit 89170-12N00 is fitted in these vehicles: Toyota Corolla E170 (2013-2018). The part number on the label of the removed unit is decisive.

This overview shows the assignment to vehicles:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label with this page. That only ensures that it is the right unit. Have the fault memory read out beforehand, because the result shows whether the control unit is defective or whether a connector 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 89170-12N00 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 89170-12N00. Processing at Airbag24 usually takes 3–4 working days.

Then create the repair order online and pack the unit well before you send it in.

Airbag24 tests the unit on the test bench, renews defective components, erases stored crash data and carries out a functional test. Afterwards your own unit goes 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 89170-12N00 get to Airbag24?

You send the control unit 89170-12N00 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends your own unit back by UPS.

Place the printed repair order in the parcel and pack the unit shockproof.