Airbag control unit with part number 89170-47180

What does the airbag control unit 89170-47180 do?

The airbag control unit 89170-47180 is the central control unit of the SRS for Toyota. It evaluates the signals from the crash sensors and, in the event of an accident, decides which airbags and seatbelt pretensioners are triggered.

That decision is made within milliseconds. The unit monitors the system continuously and reports faults via the airbag warning light.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-47180 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; it cannot be removed with a normal diagnostic tool. Ageing components, cold solder joints, moisture and corrosion, and voltage spikes can also cause the failure.

The control unit creates crash data when it registers an accident. The data remains in memory even if no airbag was deployed.

The other causes relate to the condition of the electronics. Components lose reliability with age, solder joints can go cold, and moisture and corrosion attack plug connections. Voltage spikes, for example from a weak battery or a jump start, also contribute.

How can you tell that the 89170-47180 is defective?

A defect in the 89170-47180 is indicated by the airbag warning light, which lights up permanently or intermittently. In addition there are fault messages in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

This combination is a clear warning sign that you should not ignore.

A vehicle showing such an indication should be checked promptly.

Which vehicles is the 89170-47180 fitted in?

The 89170-47180 is fitted in these vehicles: Toyota Prius III XW30 (2009-2012) and III XW30 Facelift (2012-2016).

You can find the list of vehicles for this unit here:

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

Comparing the part number on the label with this page identifies the removed unit as the right one, but says nothing yet about the cause. The fault memory read out beforehand, on the other hand, shows whether the control unit itself is defective or whether a plug or a 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 89170-47180 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the 89170-47180, create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench and finds defective components. These are then repaired, the crash data is erased and a functional test is carried out.

Processing usually takes 3–4 working days. After that Airbag24 sends your own unit 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 89170-47180 get to Airbag24?

You send the control unit 89170-47180 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel. Pack the unit shockproof.