Airbag control unit with part number 89170-47B80

What does the airbag control unit 89170-47B80 do?

The airbag control unit 89170-47B80 forms the central switching hub of the restraint system (SRS) of Toyota. It checks the signals from the crash sensors and determines in a crash within milliseconds which airbags and seatbelt pretensioners are triggered. It monitors the system continuously and reports faults via the airbag warning light.

The evaluation is designed for very short reaction times, because airbags must deploy in time. The wiring to the firing circuits is also checked continuously.

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

Why does the control unit 89170-47B80 fail?

The most common cause is crash data stored after an accident, even if no airbag fired. A normal diagnostic tool cannot erase it. Other causes are ageing electronics, moisture and corrosion at plug connections, and voltage spikes.

At Airbag24 we do not simply erase the crash data during the repair; the unit is then tested in full. A reading device alone is not enough for this.

The other causes at a glance:

• ageing electronic components
• cold solder joints
• moisture and corrosion at the plugs
• voltage spikes from the battery or a jump start

How can you tell that the 89170-47B80 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition, no connection to the diagnostic tool is established, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

A light that comes on only intermittently is also a sign of a fault in the system. It deserves the same attention as one that stays on.

If there is no connection to the diagnostic tool, the cause does not necessarily lie in the control unit. The read-out log shows where it is.

Which vehicles is the 89170-47B80 fitted in?

The 89170-47B80 control unit is fitted in these vehicles: Toyota Prius V XW60 (from 2022).

The following list shows the vehicles for this part number:

• Toyota Prius V XW60 (from 2022)

Comparing the part number on the label with this page only ensures that it is the right unit. Having the fault memory read out beforehand shows whether the control unit is defective 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 89170-47B80 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards your own, repaired unit goes back to you.

The stated working days apply only to the work at Airbag24, that is testing, repairing and checking.

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 89170-47B80 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shock-proof.