Airbag control unit with part number 89170-0DG40

What does the airbag control unit 89170-0DG40 do?

The airbag control unit 89170-0DG40 takes over control of the restraint system in vehicles from Toyota. It receives the messages from the crash sensors, determines in an accident which airbags and seatbelt pretensioners fire, and checks the entire system during operation.

As soon as a fault occurs, the unit reports it via the airbag warning light in the instrument cluster. After an accident it creates crash data and is then locked.

It works in the background and links the sensors, the firing circuits and the monitoring with one another.

Why does the control unit 89170-0DG40 fail?

With the 89170-0DG40, crash data from an earlier accident is the most common cause, even if no airbag was triggered. A normal diagnostic tool cannot remove it; at Airbag24 it is erased as part of the repair. Aged electronics, cold solder joints, moisture and corrosion in plugs and voltage spikes are also possible triggers.

Even without a triggered airbag, the unit can have stored such data, because it records the events of an accident.

The remaining causes relate to the component itself: over time electronics and solder joints age, moisture and rust attack plug connections, and voltage spikes arise, for example with a weak battery or a jump start.

How can you tell that the 89170-0DG40 is defective?

On the 89170-0DG40, a defect shows up as the airbag warning light in the instrument cluster, as error messages there, as a missing connection to the diagnostic tool and as a fault memory that you cannot clear.

These signs point to a problem in the control unit or the system:

• airbag warning light stays on permanently or intermittently
• error message in the instrument cluster
• no connection from the diagnostic tool to the control unit
• fault memory cannot be cleared

If these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the 89170-0DG40 fitted in?

The control unit 89170-0DG40 is fitted in these vehicles: Toyota Yaris XP210 (from 2020).

The assignment by model follows here:

• Toyota Yaris XP210 (from 2020)

First compare the part number on the label of the removed unit with this page; that ensures you have the right unit. Have the fault memory read out beforehand. This result shows whether the control unit itself is defective or whether a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-0D730, 89170-0DE60, 89170-0DF50, 89170-52350, 89170-K0060.

How does the repair of the 89170-0DG40 work?

For the 89170-0DG40, have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Afterwards you create the repair order online and send in the well-packed unit. Airbag24 checks it, replaces defective components, erases the crash data and carries out a function test.

The order is fixed for safety reasons: the control unit is only removed once the battery has been disconnected.

Processing at Airbag24 usually takes 3–4 working days. Afterwards you receive your own unit back. 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 89170-0DG40 get to Airbag24?

You send the 89170-0DG40 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the carton, and the unit is packed shock-proof.