Airbag control unit with part number 89170-47540

What does the airbag control unit 89170-47540 do?

The airbag control unit 89170-47540 is the central control unit of the restraint system (SRS) for Toyota. It queries the crash sensors, calculates in an accident within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the system permanently. After an accident it stores crash data and locks itself.

The unit detects faults in the system itself and reports them via the airbag warning light in the instrument cluster. For the restraint system to work in an emergency, the unit must be ready for use at all times.

Why does the control unit 89170-47540 fail?

The most common cause in the 89170-47540 is crash data stored from an accident, even without a triggered airbag. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool cannot erase crash data, but Airbag24 does this during the repair. Voltage spikes arise, for example, from a weak battery or jump-starting and can damage components in the control unit.

Whether one of these causes applies to your unit is shown only by the test on the test bench.

How can you tell that the 89170-47540 is defective?

The airbag warning light in the instrument cluster lights up on the 89170-47540 either permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool finds no connection to the control unit, and the fault memory remains.

While the defect persists, airbags and seatbelt pretensioners may fail to trigger in an emergency. The warning light is therefore a reason to have the system checked promptly.

A defect is thus indicated by the warning light and not hidden, and you should not ignore this indication.

Which vehicles is the 89170-47540 fitted in?

The control unit 89170-47540 is fitted in these vehicles: Toyota Prius III XW30 (2009-2012) and III XW30 Facelift (2012-2016).

The vehicles for which we record this part number are listed here:

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

You can compare the part number on the label with this page yourself; it only shows whether it is the correct unit. Have the fault memory read out before removal. Only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-47100, 89170-47101, 89170-47110, 89170-47111, 89170-47120, 89170-47140.

How does the repair of the 89170-47540 work?

First have the fault memory of the 89170-47540 read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

You pack the unit shockproof and send it in. Airbag24 tests it on the test bench, renews defective components, erases stored crash data and carries out a functional test, after which the unit goes back to you.

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 89170-47540 get to Airbag24?

You send the control unit 89170-47540 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel, and pack the unit shockproof.