Airbag control unit with part number 89170-12C70

What does the airbag control unit 89170-12C70 do?

In the Toyota vehicle, the airbag control unit 89170-12C70 forms the control centre of the restraint system. It records through the crash sensors what happens in a collision and triggers airbags and seatbelt pretensioners within milliseconds in an accident.

During normal operation, the unit monitors the connected components of the system. If it detects a fault, it reports it via the airbag warning light.

After an accident, it stores crash data and locks itself. This sequence is fixed in the unit.

Why does the control unit 89170-12C70 fail?

For the 89170-12C70, the most common cause of a failure is stored crash data after an accident, even if no airbag has fired. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data stays in the memory, and an ordinary diagnostic tool cannot erase it. This applies regardless of how the airbag responded.

• aged electronic components in the unit
• cold solder joints on the circuit board
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 89170-12C70 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently for the 89170-12C70. An error message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and the fault memory cannot be erased.

If the control unit is faulty, airbags and seatbelt pretensioners may fail to deploy in an emergency. The warning light is therefore a prompt to act without delay.

If the diagnostic tool can access the unit, the fault memory shows the stored entries.

Which vehicles is the 89170-12C70 fitted in?

The 89170-12C70 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The following list shows the assigned models.

• Toyota Corolla E170 (2013-2018)

Compare the part number on the unit with this page. This only shows whether you have the right unit in hand. Whether the control unit is defective or a connector or cable is behind the fault is clarified only by reading out the fault memory.

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 89170-12C70 work?

For the 89170-12C70, first have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components and erases stored crash data. A function test follows before your own unit is returned.

For inspecting, repairing and testing in-house, Airbag24 usually needs 3–4 working days. 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 89170-12C70 get to Airbag24?

You send the control unit 89170-12C70 in as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Place the printed repair order in the parcel. Pack the unit shockproof so that it arrives undamaged.