Airbag control unit with part number 89170-0DF40

What does the airbag control unit 89170-0DF40 do?

The airbag control unit 89170-0DF40 coordinates the restraint system (SRS) in vehicles of Toyota. It decides in a crash which airbags and seatbelt pretensioners trigger, and monitors the system continuously.

The data for this comes from crash sensors that record acceleration. The device reports faults in the system via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-0DF40 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot delete it. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

A diagnostic tool can only read out the crash data, not delete it. Airbag24 removes it during the repair.

The other causes are everyday consequences of operation: electronics age, solder joints can go cold, and moisture and corrosion attack plug connections. Voltage spikes, for example from a weak battery or a jump start, additionally stress the system.

How can you tell that the 89170-0DF40 is defective?

A defect on 89170-0DF40 shows up as the airbag warning light in the instrument cluster, a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. Airbags and seatbelt pretensioners may then possibly not trigger in an emergency.

Follow up on the message promptly, because only reading out the fault memory reliably narrows down the cause.

Which vehicles is the 89170-0DF40 fitted in?

The 89170-0DF40 is used in these vehicles: Toyota Yaris XP210 (from 2020).

The list shows the vehicles for which this part number is recorded with us:

• Toyota Yaris XP210 (from 2020)

Before shipping, compare the part number on the label of the unit with this page so that you know you have the right unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory, which you have read out beforehand.

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 89170-0DF40 work?

First read out the fault memory, enclose the log and then disconnect the battery. Only then remove the unit, create the repair order online and pack it well before sending it in.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the crash data and carries out a function test. Afterwards the unit goes back to you.

Processing at Airbag24 usually takes 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 89170-0DF40 get to Airbag24?

You send the control unit 89170-0DF40 to us as a parcel or book a UPS collection for an extra charge. The return after the repair is handled by UPS.

Enclose the printed repair order in the parcel, and pack the unit shock-resistant.