Airbag control unit with part number 89170-BZ570

What does the airbag control unit 89170-BZ570 do?

The airbag control unit 89170-BZ570 coordinates the restraint systems at Toyota. In an impact it checks the sensor values, decides within fractions of a second on the triggering and then monitors the components. It makes faults visible via the warning light in the instrument cluster.

After an accident it stores crash data and then locks itself. Only a repair lifts the lock.

In everyday life the unit stays unobtrusive and works in the background. Only when something is wrong does it come into focus.

Why does the control unit 89170-BZ570 fail?

Most often the failure is caused by crash data from an accident in which no airbag fired. Ordinary diagnostic tools cannot erase it. Further causes are ageing electronics, cold solder joints, moisture or corrosion at connectors, and voltage spikes, for example from a weak battery or a jump start.

Aged components and moist contacts deteriorate over time. A voltage spike, however, can trigger a fault within seconds, which the unit then stores.

An attempt to erase the data via the diagnostic tool therefore remains unsuccessful.

How can you tell that the 89170-BZ570 is defective?

Watch the airbag system warning light in the instrument cluster: it can stay on permanently or only intermittently. There are also fault messages in the instrument cluster, a diagnostic tool without a connection to the control unit, and a fault memory that you cannot empty. In an emergency there is then a risk that airbags and seatbelt pretensioners will not fire.

The combination of signs is what matters. A warning light alone says little; combined with a message in the instrument cluster or a memory that cannot be emptied, a clear picture emerges.

Reacting to these signs by waiting is not a good idea, because the system keeps working without being checked.

Which vehicles is the 89170-BZ570 fitted in?

The 89170-BZ570 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The list shows the models that are recorded for this control unit with us.

• Toyota Avanza F650 Facelift (2015-2023)

Have the fault memory read out before removal. Only this log shows whether the unit itself is affected or whether a connector or cable is causing the fault. Additionally compare the part number on the removed unit with this page; this only ensures that it is the right unit.

For the same vehicles, we also repair control units with the part numbers 17952812-928112, 17952815-928143, 89170-BZ440.

How does the repair of the 89170-BZ570 work?

At the start comes reading out the fault memory, whose log accompanies the unit. Only then do you disconnect the battery and remove the control unit. Next you create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the control unit goes onto the test bench. Stored crash data is erased, defective components are replaced if necessary, and a function test follows. Then your 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-BZ570 get to Airbag24?

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

The printed repair order goes into the parcel, and the unit also needs shock-resistant packaging.