Airbag control unit with part number 89170-47740

What does the airbag control unit 89170-47740 do?

The airbag control unit 89170-47740 is the control unit of the restraint system (SRS) of Toyota. It processes the signals from the crash sensors, decides in an impact which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. If it detects a fault, it reports it via the airbag warning light.

After an accident it creates crash data and locks itself. What it reports you see in the instrument cluster.

This process is technically clearly structured and runs without any action on your part.

Why does the control unit 89170-47740 fail?

Most often the cause is crash data from an accident, in which possibly no airbag triggered at all; a normal diagnostic tool does not erase them. Further causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion on plug connections
• Voltage spikes, for example from a jump start

How can you tell that the 89170-47740 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through an error message, a missing connection to the diagnostic tool, or a fault memory that cannot be emptied. Then airbags and seatbelt pretensioners may possibly not trigger in an emergency.

The warning comes from the light itself, so a prompt check is the right next step.

Which vehicles is the 89170-47740 fitted in?

The 89170-47740 is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

The models are listed as follows:

• Toyota Prius IV XW50 (2015-2018)
• Toyota Prius IV XW50 Facelift (2018-2022)

With the label of the removed unit you check whether the part number matches the one on this page; the comparison says nothing more. The fault memory shows the cause: it reveals whether the control unit itself is affected or whether a cable or plug is involved. Therefore have it read out in advance.

For the same vehicles, we also repair control units with the part numbers 89170-47030, 89170-47611.

How does the repair of the 89170-47740 work?

The procedure is firmly prescribed for safety reasons. First you read out the fault memory and enclose the log, then you disconnect the battery and only then remove the 89170-47740. Online you create the repair order and send the unit in well packed. Airbag24 checks, repairs and tests the unit as a rule within 3–4 working days, erases the crash data and returns your own unit.

The deadline applies only to the work in the Airbag24 workshop.

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 89170-47740 get to Airbag24?

You send the 89170-47740 as a parcel to Airbag24, or you have it collected by UPS for an extra charge. Airbag24 returns it to you by UPS after the repair.

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