Airbag control unit with part number 89170-47640

What does the airbag control unit 89170-47640 do?

The airbag control unit 89170-47640 controls the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit reports faults in the system via the airbag warning light in the instrument cluster. This allows a problem to be recognised early, before it matters in an emergency.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-47640 fail?

The most common cause is crash data after an accident, even if no airbag has deployed. Further causes are:

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

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery

All other causes concern the electronics and their connections.

How can you tell that the 89170-47640 is defective?

A defect in the 89170-47640 shows itself mainly through the airbag warning light, which lights up permanently or intermittently. Error messages and problems when reading out are added to this.

• The airbag warning light in the instrument cluster lights up.
• An error message appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

If the light is on, airbags and seatbelt pretensioners may not fire in an emergency. A light that goes out does not mean that the fault has been rectified.

Which vehicles is the 89170-47640 fitted in?

The 89170-47640 is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

The list shows the vehicles in which this control unit has been installed.

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

First compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Then have the fault memory read out, because only the log shows whether the control unit or a plug or a cable is defective.

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

How does the repair of the 89170-47640 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 89170-47640. Then create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. After that the unit is returned to you.

Processing at Airbag24 takes 3–4 working days as a rule. This time covers only checking, repairing and testing.

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 89170-47640 get to Airbag24?

You send the control unit 89170-47640 to Airbag24 in 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 is packed shock-resistant.