Airbag control unit with part number 89170-12700

What does the airbag control unit 89170-12700 do?

The airbag control unit 89170-12700 controls the restraint system (SRS) for Toyota centrally. It processes the signals from the crash sensors, decides in an accident within milliseconds on triggering, and monitors the system continuously.

The monitoring covers sensors, firing circuits and wiring. If the unit detects a fault, it switches on the airbag warning light in the instrument cluster.

After an accident, it stores crash data and then locks itself.

Why does the control unit 89170-12700 fail?

The most common cause is crash data stored in the unit after an accident, even if no airbag was deployed. Standard diagnostic tools cannot erase it. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes also come into consideration.

Crash data cannot be removed with the usual tools. The deletion takes place as part of the repair.

Electronic components age, solder joints can be cold, and moisture or corrosion affect plug connections. Voltage spikes, for example from a weak battery or jump start, add further strain on the unit.

Which cause is present is shown only by the fault memory.

How can you tell that the 89170-12700 is defective?

The airbag warning light in the instrument cluster comes on permanently or intermittently, a fault message appears, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then not deploy in an emergency.

The light is the clearest signal. As soon as it is on, it is worth having the fault memory read out so that it becomes clear what is wrong.

If the diagnostic tool gets no contact, the cause may lie in the unit, a plug or the cable. Only testing can narrow that down.

Which vehicles is the 89170-12700 fitted in?

The airbag control unit 89170-12700 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The list shows the vehicles recorded for 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. Also have the fault memory read out beforehand, because only this log shows whether the control unit 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 89170-12700 work?

First read out the fault memory and enclose the log with the unit. Then disconnect the battery, and only then remove the control unit 89170-12700. Create the repair order online afterwards, then pack the unit well and send it in.

At Airbag24, the unit is tested on the test bench, defective components are repaired, the crash data is deleted and a functional test is carried out. Processing usually takes 3–4 working days.

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 89170-12700 get to Airbag24?

The unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, it comes back to you by UPS.

Place the printed repair order in the parcel and pack the control unit shock-proof.