Airbag control unit with part number 89170-12C80

What does the airbag control unit 89170-12C80 do?

The airbag control unit 89170-12C80 coordinates the restraint system (SRS) for Toyota. It continuously checks the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

If the unit detects a fault, it reports it via the airbag warning light. After an accident it creates crash data and locks itself.

Why does the control unit 89170-12C80 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed at all. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be removed with a standard diagnostic tool. As long as it stays in the memory, the fault remains too.

Ageing components and cold solder joints develop over time. Moisture and corrosion attack the plug contacts, which is why it makes sense to look at the connections.

Voltage spikes occur, for example, with a weak battery or during a jump start, and put a strain on the electronics.

How can you tell that the 89170-12C80 is defective?

A fault shows first on the airbag warning light in the instrument cluster, which lights permanently or intermittently. A fault message in the instrument cluster, a diagnostic tool without connection and a fault memory that cannot be cleared confirm this. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The warning light identifies the fault directly, and prompt action is the most obvious response to it.

A diagnostic tool that cannot establish a connection is a further sign of a fault.

Which vehicles is the 89170-12C80 fitted in?

The control unit 89170-12C80 was fitted in this vehicle: Toyota Corolla E170 (2013-2018).

The list directly below names the vehicles in which this unit occurs.

• Toyota Corolla E170 (2013-2018)

(a) The part number on the label of the removed unit should be compared with this page, so that you can be sure it is the correct unit. (b) Have the fault memory read out beforehand, because only 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 89170-12C80 work?

Airbag24 generally needs 3–4 working days for testing, repairing and checking the control unit 89170-12C80. Beforehand you read out the fault memory, disconnect the battery and only then remove the unit.

Then you create the repair order online and send the unit in packed. Airbag24 tests it on the test bench, replaces defective components, erases crash data and carries out a function test.

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 89170-12C80 get to Airbag24?

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

The printed repair order goes in the parcel, and the control unit is packed shock-resistant.