Airbag control unit with part number 89170-47100

What does the airbag control unit 89170-47100 do?

The airbag control unit 89170-47100 is the central control unit of the restraint system (SRS) in Toyota. It measures via the crash sensors whether an accident has occurred and then decides within milliseconds whether to fire the airbags and seatbelt pretensioners. After an accident it stores crash data and locks itself; the repair lifts the lock.

While driving, the control unit monitors the wiring and its own circuits. It reports faults via the airbag warning light in the instrument cluster.

The electronics thus take on two tasks: they monitor the system, and in an emergency they trigger it.

Why does the control unit 89170-47100 fail?

Stored crash data after an accident cause the failure most often, even without a deployed airbag; they cannot be removed with a diagnostic tool. Further causes are ageing components, solder joints, moisture and corrosion, as well as voltage spikes.

The crash data are stored in the unit even if you were able to carry on driving unharmed after the event. Reading them out shows them, but does not remove them.

These causes also come into consideration:

• ageing of electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes from a weak battery or jump-starting

How can you tell that the 89170-47100 is defective?

A defect shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and as a fault message. If the fault memory cannot be cleared or there is no connection to the diagnostic tool, that is a clear indication. Airbags and seatbelt pretensioners may then possibly not fire in an emergency.

The light shows the state of the system and stands for the finding of the control unit itself. The message in the display supplements it, and the fault memory provides the exact information.

If the fault returns after clearing, the cause is probably in the system itself.

Which vehicles is the 89170-47100 fitted in?

The control unit 89170-47100 is fitted in these vehicles: Toyota Prius III XW30 (2009-2012) and III XW30 Facelift (2012-2016).

The compilation can be compared with your own car.

• Toyota Prius III XW30 (2009-2012)
• Toyota Prius III XW30 Facelift (2012-2016)

The label of the removed unit shows the part number, which you compare with this page. This ensures it is the right unit. Have the fault memory read out in addition, because only the log 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 89170-47110, 89170-47B60.

How does the repair of the 89170-47100 work?

For the repair of the 89170-47100, first have the fault memory read out and enclose the log. Then disconnect the battery, remove the unit, create the repair order online and send the unit in. Airbag24 generally needs 3–4 working days for checking, repairing and testing.

The well-packed unit is sent in. In the workshop it is examined on the test bench, defective components are repaired and the crash data are erased. A function test completes the work, after which your own unit goes back.

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 89170-47100 get to Airbag24?

You send the control unit 89170-47100 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

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