Airbag control unit with part number 89170-12E90

What does the airbag control unit 89170-12E90 do?

The control unit 89170-12E90 is the central control unit of the SRS in Toyota vehicles. It processes the signals of the crash sensors, decides in a crash within milliseconds on triggering airbags and seatbelt pretensioners, and monitors the system continuously. Faults are shown via the airbag warning light.

The unit works permanently in the background. It checks the connections to the connected sensors and triggers so that faults become apparent early.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-12E90 fail?

The most common cause is stored crash data from an accident, even where no airbag has deployed; a standard diagnostic tool cannot erase it. Ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery, come on top of this.

The crash data stays in the unit after the accident, even if no airbag has opened. Airbag24 erases it as part of the repair of control unit 89170-12E90.

Independently of this, further causes have an effect. Electronic components age, solder joints go cold, and moisture or corrosion impair the contacts.

Voltage spikes, for example from a jump start or a weak battery, additionally stress the electronics.

How can you tell that the 89170-12E90 is defective?

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

Typical signs at a glance:

• airbag warning light on continuously or intermittently
• error message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• fault memory cannot be erased

In an emergency, airbags and seatbelt pretensioners may then fail to trigger. The light is therefore not a minor matter.

Which vehicles is the 89170-12E90 fitted in?

The control unit 89170-12E90 from Toyota is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

Here you can see the vehicles for this part number as they are recorded with us.

• Toyota Corolla E170 (2013-2018)

First check whether the part number on the label of the removed unit matches this page. That way you know it is the correct unit. Also have the fault memory read out. Only that 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 89170-12E90 work?

First have the fault memory of control unit 89170-12E90 read out and attach the log. Then disconnect the battery, and only after that remove the unit. Next, create the repair order online and send the well-packed unit in. The processing time for checking, repairing and testing at Airbag24 is usually 3–4 working days.

On the test bench, Airbag24 examines the unit, replaces defective components, erases the crash data and carries out a function test. Your own unit then 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 89170-12E90 get to Airbag24?

You send the control unit 89170-12E90 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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