Airbag control unit with part number 89170-12N10

What does the airbag control unit 89170-12N10 do?

The 89170-12N10 controls the restraint system (SRS) of Toyota and keeps it monitored during operation. In a collision it calculates within milliseconds which airbags and seatbelt pretensioners are triggered. If the unit detects a fault, it shows this via the airbag warning light.

The crash sensors supply the unit with the measured values on which it relies. Without this evaluation, targeted triggering would not be possible.

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

Why does the control unit 89170-12N10 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. This data cannot be removed with a normal diagnostic tool. Other possible causes are ageing components, cold solder joints, moisture or corrosion on plugs, and voltage spikes.

The crash data remains in the unit even if the car continues to drive unnoticed afterwards. That it runs normally afterwards does not mean that no crash data is stored in the unit.

The other causes lie in the electronics and their connections. Solder joints can go cold, components age, and moisture causes corrosion on contacts. A weak battery or a jump start can also generate voltage spikes.

How can you tell that the 89170-12N10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, or an error message appears in the instrument cluster. The diagnostic tool then finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may not be able to deploy as a result.

These signs are a clear reason to have the system checked. The warning light is the most visible indicator.

An intermittent fault is also recorded in the memory and calls for a read-out.

Which vehicles is the 89170-12N10 fitted in?

Whether the vehicle matches this unit can be seen in the list. The 89170-12N10 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles known for this part number are listed here:

• Toyota Corolla E170 (2013-2018)

If the part number on the label of the removed unit matches this page, the correct unit is confirmed. Have the fault memory read out in advance, because the 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 89170-12N10 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the control unit and create the repair order online. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the control unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Afterwards 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 89170-12N10 get to Airbag24?

You send the unit as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel. Pack the control unit shock-proof.