Airbag control unit with part number 89170-12E50

What does the airbag control unit 89170-12E50 do?

The airbag control unit 89170-12E50 is the central control unit of the restraint system (SRS) of Toyota. It evaluates the crash sensors, decides in an accident within fractions of a second which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. To do this, it stores the events in the fault memory, from which they can be read out later.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-12E50 fail?

The most common cause is crash data that remains in the unit after an accident, even if no airbag was triggered. Normal diagnostic tools cannot erase it. Aged components, cold solder joints and voltage spikes are also possible causes.

Crash data is the first place to look during a fault search, because it reliably shows up during the readout. It is therefore not by chance that it appears at the start of this page.

Moisture and corrosion at plug connectors are also among the causes. They develop over time and cannot be detected without checking the unit.

How can you tell that the 89170-12E50 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears in the instrument cluster, or the diagnostic tool receives no connection to the control unit. The fault memory also cannot be cleared. In this case, airbags and seatbelt pretensioners may not be able to trigger in an emergency.

The following signs at a glance:

• Airbag warning light stays on permanently or intermittently
• Error message in the instrument cluster
• No connection to the control unit via the diagnostic tool
• Fault memory cannot be cleared

The warning light remains a warning signal that must be taken seriously.

Which vehicles is the 89170-12E50 fitted in?

This control unit belongs to Toyota and is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The list of assigned vehicles follows here:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page. More than certainty that you have the right unit this comparison does not provide. Therefore have the fault memory read out, because it shows whether the control unit is defective or 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 89170-12E50 work?

Processing at Airbag24 usually takes 3–4 working days. You have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Afterwards you create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. After that, 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 89170-12E50 get to Airbag24?

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

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