Airbag control unit with part number 89170-47840

What does the airbag control unit 89170-47840 do?

The airbag control unit 89170-47840 forms the switching centre of the restraint system (SRS) for Toyota. From the signals of the crash sensors, it calculates within milliseconds which airbags and seatbelt pretensioners are to be triggered in an accident.

At the same time, it monitors all components of the system. It shows any faults it finds via the airbag warning light in the instrument cluster.

After an accident, the control unit records crash data and locks itself. This lock is part of the system's design.

Why does the control unit 89170-47840 fail?

The most important cause is crash data stored after an accident, even if no airbag has fired. An ordinary diagnostic tool cannot reach this data, so faults remain.

Beyond that, electronic components age over the years, and cold solder joints in the unit can cause contact problems.

Moisture and corrosion at plug connections are just as much a cause, as are voltage spikes. A weak battery or a jump-start can produce such spikes, which strain the electronics.

How can you tell that the 89170-47840 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, an error message appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The airbag warning light can be the first warning sign that drivers notice. If it lights up permanently or keeps coming on, the finding should be checked. In a real emergency, airbags and seatbelt pretensioners may not deploy.

A check with the diagnostic tool will finally provide clarity.

Which vehicles is the 89170-47840 fitted in?

The 89170-47840 is fitted in these vehicles: Toyota Prius V XW60 (from 2022).

The list contains the vehicles for which this part number has been recorded so far.

• Toyota Prius V XW60 (from 2022)

Before you remove the unit, have the fault memory read out. That way it is certain whether the control unit is defective and not a plug or a cable. Then compare the part number on the label with the information given here.

For the same vehicles, we also repair control units with the part numbers 89170-47030, 89170-47860.

How does the repair of the 89170-47840 work?

Before removal, have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit, create a repair order online and send in the well-packed unit. Airbag24 needs 3–4 working days as a rule for checking, repairing and testing.

At Airbag24, technicians check the unit on the test bench and replace defective components. Afterwards, stored crash data is deleted and a function test is carried out.

Your own unit then 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 89170-47840 get to Airbag24?

You send the control unit 89170-47840 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel, and the unit should be packed shock-proof.