Airbag control unit with part number 89170-0DC70

What does the airbag control unit 89170-0DC70 do?

The airbag control unit 89170-0DC70 is the central control unit of the SRS restraint system of Toyota. It processes the measured values of the crash sensors, decides within a few milliseconds in an impact about airbags and seatbelt pretensioners, and checks the system continuously. After a crash it stores crash data and locks itself.

The unit reports faults via the airbag warning light in the instrument cluster. The check runs during all driving, so irregularities are detected promptly.

The control unit works together with sensors, wiring and display. A fault in one of these parts can therefore become visible in the control unit.

Why does the control unit 89170-0DC70 fail?

The most common cause for the control unit 89170-0DC70 is stored crash data after an accident, even if no airbag has deployed. A standard diagnostic tool cannot delete it. Aged components, cold solder joints, moisture and voltage peaks are also possible causes.

The crash data remains in the memory of the unit, and the fault display stays visible until the unit has been repaired. The other causes mainly concern the electronics itself. Electronic components age, solder joints can go cold, and moisture or corrosion disturb plug connectors. Voltage peaks, for example from a weak battery or from starting with external power, put additional strain on the circuit.

How can you tell that the 89170-0DC70 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently on the control unit 89170-0DC70 as soon as a defect is present. In addition, a fault message appears in the instrument cluster. If the diagnostic tool gets no connection to the control unit and the fault memory cannot be cleared, airbags and seatbelt pretensioners may fail to deploy in a real crash.

The light is therefore not a random finding, but the signal that the system has detected a fault. The cause is only identified by checking the fault memory.

Which vehicles is the 89170-0DC70 fitted in?

The control unit 89170-0DC70 is fitted in: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017).

The vehicles to which this part number is assigned are listed below.

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

Comparing the part number on the label of the removed unit with this page confirms that you have the right unit. Whether the control unit is actually defective or a plug or wire is causing the fault is only shown by reading out the fault memory beforehand.

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 89170-0DC70 work?

At the start, the fault memory is read out and the log is enclosed. Only then do you disconnect the battery and remove the control unit 89170-0DC70. Finally, you create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is deleted and a function test is run. Afterwards your own unit is sent back to you. Processing at Airbag24 usually takes 3–4 working days.

This order of steps is required for safety reasons. 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 89170-0DC70 get to Airbag24?

You send the control unit 89170-0DC70 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 into the parcel and pack the unit shockproof.