Airbag control unit with part number 89170-12340

What does the airbag control unit 89170-12340 do?

The airbag control unit 89170-12340 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.

While driving, the unit monitors the entire system. If it detects a fault, it displays it via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. This storage is permanently built into the unit.

Why does the control unit 89170-12340 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or jump-starting.

Crash data cannot be cleared with common tools, so the repair must remove it. Until then the fault remains visible in the memory.

The other causes can develop slowly. Ageing, contact problems and moisture act for months before they show up as a fault.

How can you tell that the 89170-12340 is defective?

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

The warning light is the most important signal you should watch. As long as it is on, the airbags and seatbelt pretensioners may possibly not trigger in an emergency.

A missing connection to the diagnostic tool can be due to the control unit or the wiring. Which cause applies is shown by reading out the fault memory.

Which vehicles is the 89170-12340 fitted in?

The control unit 89170-12340 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles assigned to this part number can be found here:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page so that you can confirm the correct unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is at fault or a plug or cable is causing the fault.

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 89170-12340 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Afterwards you create a repair order online and send the unit in. Processing the repair of the 89170-12340 at Airbag24 usually takes 3–4 working days.

Pack the unit well and send it in. The order of the steps is for your safety.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Afterwards your own unit is returned 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 89170-12340 get to Airbag24?

You send the unit in as a parcel or book UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-resistant.