Airbag control unit with part number 89170-12G90

What does the airbag control unit 89170-12G90 do?

The airbag control unit 89170-12G90 is the central control unit of the restraint system (SRS) for Toyota. It processes the signals from the crash sensors and decides in a crash which airbags and seatbelt pretensioners are triggered.

The evaluation takes only fractions of a second. At the same time, the unit monitors the entire system and reports faults via the airbag warning light.

After an accident, the control unit stores crash data and locks itself. Only the repair lifts the lock again.

Why does the control unit 89170-12G90 fail?

The most common cause is stored crash data, even if no airbag has deployed. Further triggers are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

An ordinary diagnostic tool cannot erase the crash data. Airbag24 handles this during the repair.

The further causes at a glance:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Which of these triggers applies in a particular case is shown only by the test.

How can you tell that the 89170-12G90 is defective?

A fault in the 89170-12G90 shows on the airbag warning light, on error messages in the instrument cluster, on a diagnostic tool with no connection, or on a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool cannot establish a connection with the control unit
• Fault memory cannot be cleared

The warning light is the indicator through which the fault is displayed.

If such signs appear, have the cause checked promptly.

Which vehicles is the 89170-12G90 fitted in?

The 89170-12G90 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The overview contains the vehicles we have on record for this part number.

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of your removed unit with this page. This only shows you that it is the right unit. Also have the fault memory read out before you remove the unit. Only this result 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 89170-12G90 work?

You have the fault memory read out, then disconnect the battery and only last remove the 89170-12G90. At Airbag24, processing usually takes 3–4 working days.

Attach the log to the unit and create the repair order online. Then pack the control unit well and send it in.

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored 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 89170-12G90 get to Airbag24?

You send the control unit 89170-12G90 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return of your own unit takes place by UPS after the repair.

The printed repair order goes into the parcel. Pack the unit shock-proof.