Airbag control unit with part number 89170-12E70

What does the airbag control unit 89170-12E70 do?

The control unit 89170-12E70 is the central control unit of the airbag restraint system of Toyota. It evaluates the signals from the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If the unit detects a fault, it stores it in the fault memory and shows it via the airbag warning light. Monitoring continues uninterrupted in the background.

After an accident, the control unit stores crash data and then switches to a locked state.

Why does the control unit 89170-12E70 fail?

The most common cause is crash data from an accident that remains in the memory even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains stored until Airbag24 removes it during the repair. It is a trace of the event that the unit retains.

The other causes tend to develop gradually:

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

How can you tell that the 89170-12E70 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. In addition, the diagnostic tool has no connection to the control unit, and the fault memory cannot be erased. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The airbag warning light is the first thing you should watch. It displays a detected fault directly in your field of view while driving.

Have the system checked promptly. A warning in the instrument cluster is not a minor matter that you should put off.

Which vehicles is the 89170-12E70 fitted in?

The control unit 89170-12E70 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The list shows the vehicles for which this part number is stored.

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit. Have the fault memory read out beforehand, as this result alone shows whether the control unit is defective or a wire and plug are 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 89170-12E70 work?

You have the fault memory read out and attach the log. Then you disconnect the battery, remove the control unit, create the repair order online and pack the unit well. At Airbag24, checking, repairing and the function test usually take 3–4 working days.

Airbag24 checks the control unit on the test bench, 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 89170-12E70 get to Airbag24?

You send the control unit 89170-12E70 as a parcel or book a 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 unit shock-proof.