Airbag control unit with part number 89170-47140

What does the airbag control unit 89170-47140 do?

The 89170-47140 is the control unit of the airbag system in vehicles of the make Toyota. It evaluates the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

This decision has to be made within milliseconds. During operation the unit monitors the entire system and shows faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and then locks itself.

Why does the control unit 89170-47140 fail?

The most common cause is stored crash data after an accident, even if no airbag has deployed. The following further causes are also possible:

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

Crash data cannot be removed with a common diagnostic tool. The other causes are hard to detect from the outside and only show up in the fault memory.

How can you tell that the 89170-47140 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and fault messages appear. In addition there is a diagnostic tool without a connection to the control unit and a fault memory that cannot be cleared.

A missing contact to the diagnostic tool indicates that communication in the system may be disrupted. A warning light that only lights up intermittently also needs clarifying.

In an emergency, airbags and seatbelt pretensioners may not trigger. Therefore have the finding checked promptly.

Which vehicles is the 89170-47140 fitted in?

First check whether your vehicle matches this assignment. The 89170-47140 is fitted in these vehicles: Toyota Prius III XW30 (2009-2012) and III XW30 Facelift (2012-2016).

The following list shows the vehicles to which this control unit is assigned:

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

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

For the same vehicles, we also repair control units with the part numbers 89170-47110, 89170-47B60.

How does the repair of the 89170-47140 work?

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

Pack the unit well and send it in. Airbag24 checks it on the test bench, replaces defective components, deletes stored crash data and runs a function test.

Afterwards your own control unit is returned 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 89170-47140 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

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