Airbag control unit with part number 89170-47890

What does the airbag control unit 89170-47890 do?

The airbag control unit 89170-47890 coordinates the restraint system (SRS) in Toyota vehicles. It reads the signals from the crash sensors, makes the decision on airbags and seatbelt pretensioners within milliseconds in a crash, and monitors everything continuously. After a crash, it stores crash data and locks itself.

The control unit reports detected faults via the airbag warning light in the instrument cluster. This makes it the central point where you can notice a defect at all.

The lock belongs to the concept of the system and applies to the entire restraint system, not to individual components. Sensors in the vehicle continuously supply the control unit with values, which it evaluates in real time. This comparison runs in the background all the time, whether you are driving or the vehicle is parked. The system remains active even when the vehicle is standing still.

Why does the control unit 89170-47890 fail?

The main cause is the crash data stored after an accident, even if no airbag was triggered. Added to this are ageing electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes such as those from a weak battery.

An ordinary diagnostic tool does not erase crash data. At Airbag24, it is erased as part of the repair.

Electronics age gradually, and cold solder joints can remain inconspicuous for a long time. Moisture builds up contact resistance on the contacts over time.

A jump-start or a weakened battery brings voltage spikes that can load the electronics.

How can you tell that the 89170-47890 is defective?

The airbag warning light in the instrument cluster lights up permanently or at times, and a fault message appears in the instrument cluster. In addition, the diagnostic tool does not connect to the control unit.

If the fault memory cannot be cleared, that is a further sign of a defect. In this situation, the airbags and seatbelt pretensioners may not trigger in an emergency.

That is why the warning light is not a detail, but a clear signal that you should take seriously.

Which vehicles is the 89170-47890 fitted in?

The control unit 89170-47890 is fitted in these vehicles: Toyota Prius V XW60 (from 2022).

The following vehicles are recorded for this control unit:

• Toyota Prius V XW60 (from 2022)

First check whether the part number on the label of the removed unit matches this page. That only confirms that it is the matching unit. Have the fault memory read out beforehand, because only then will it become clear whether the control unit or a plug or cable is the cause.

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

How does the repair of the 89170-47890 work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand, have the fault memory read out, enclose the log, disconnect the battery and only then remove the control unit 89170-47890.

Then create a repair order online and send in the well-packed unit. Airbag24 checks it on the test bench, repairs defective components, erases the crash data and carries out a function test.

The 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 89170-47890 get to Airbag24?

You send the control unit 89170-47890 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order in the parcel, and pack the unit shockproof.