Airbag control unit with part number 89170-47701

What does the airbag control unit 89170-47701 do?

The airbag control unit 89170-47701 forms the central switching point of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors and determines in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

As long as the vehicle is moving, the unit continuously checks the function of the system. If it detects a deviation, it reports this via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 89170-47701 fail?

The most common cause is stored crash data after an accident, even without a deployed airbag. Further causes are, in brief, ageing components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

How can you tell that the 89170-47701 is defective?

A defect shows up as the airbag warning light in the instrument cluster staying on permanently or intermittently, as a fault message in the instrument cluster, as a lack of connection to the diagnostic tool, and as a fault memory that cannot be cleared.

• Airbag warning light stays on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

If you notice these signs, have the system checked promptly. In an emergency, airbags and seatbelt pretensioners may fail to deploy.

Which vehicles is the 89170-47701 fitted in?

The 89170-47701 is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

The following overview lists these vehicles:

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

Two things matter before removal. Comparing the part number on the label of the unit with this page only confirms that it is the correct unit. Whether the control unit is actually defective, or whether a plug or cable is causing the fault, is shown only by reading out the fault memory, which you should therefore have done beforehand.

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

How does the repair of the 89170-47701 work?

Enclose the log of the fault memory before you disconnect the battery and remove the control unit. Then create the repair order online and send the unit in well packed. Testing, repair and the function test at Airbag24 usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Only after that is your own unit sent back.

The procedure serves safety: disconnecting the battery always comes before removal.

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 89170-47701 get to Airbag24?

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

Enclose the printed repair order in the parcel and pack the control unit shock-resistant so that it survives shipping undamaged.