Airbag control unit with part number 89170-0DC90

What does the airbag control unit 89170-0DC90 do?

The airbag control unit 89170-0DC90 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals of the crash sensors, decides in an accident within milliseconds on triggering the airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The evaluation runs inside the unit itself, because in an accident there is no time for detours. The control unit continuously checks the sensors, the igniter output stages and the wiring between them.

If it detects a fault, it shows it via the airbag warning light in the instrument cluster.

Why does the control unit 89170-0DC90 fail?

The control unit 89170-0DC90 most often fails because of stored crash data, even if no airbag fired. A normal diagnostic tool cannot erase this data. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is also created in accidents without an airbag deployment, and the unit stores it nonetheless. A standard diagnostic tool cannot reach these entries, so they remain in memory.

The other causes are general in nature. Electronics age over time, solder joints can go cold, and moisture causes corrosion at plug connections. Voltage spikes, for example from a weak battery or from connecting jump leads, additionally stress the electronics.

How can you tell that the 89170-0DC90 is defective?

A defect on the 89170-0DC90 shows on the airbag warning light in the instrument cluster, which lights constantly or at times. Add to that an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared.

As long as one of these signs exists, airbags and seatbelt pretensioners may fail to deploy in an emergency. The light thus makes the condition visible and is a warning you should take seriously.

Whether the control unit itself is affected or a plug is behind it is only clarified by reading out the fault memory.

Which vehicles is the 89170-0DC90 fitted in?

The control unit 89170-0DC90 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017). The assignment applies to exactly this part number and not to other control units of the same type.

The vehicles in which this control unit was found are listed here:

• Toyota Yaris XP130 2nd Facelift (2017-2020)
• Toyota Yaris XP130 (2010-2014)
• Toyota Yaris XP130 1st Facelift (2014-2017)

Compare the part number on the label of the removed unit with this page. That only ensures it is the right unit. Also have the fault memory read out beforehand, because only that 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 2310009950, 89170-0D300, 89170-0D320, 89170-0D590, 89170-0D600, 89170-0D620.

How does the repair of the 89170-0DC90 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit 89170-0DC90, create the repair order online and send the unit well packed.

Airbag24 checks the unit on the test bench, repairs defective components, clears stored crash data and runs a function test. For checking, repairing and testing at Airbag24, usually 3–4 working days are planned; your own steps and the shipping are not included.

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 89170-0DC90 get to Airbag24?

You send the control unit 89170-0DC90 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.