Airbag control unit with part number 89170-BZ611

What does the airbag control unit 89170-BZ611 do?

The airbag control unit 89170-BZ611 is the central control unit of the SRS restraint system for Toyota. It processes the messages from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and checks the system continuously. It indicates faults via the airbag warning light.

After an accident the control unit stores crash data and then locks itself. In normal operation it remains inconspicuous.

Why does the control unit 89170-BZ611 fail?

The most common cause is crash data stored after an accident, even without a triggered airbag; it cannot be erased with an ordinary diagnostic tool. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plugs, and voltage spikes, for example from a weak battery or a jump start.

That no airbag was triggered in the accident does not mean that no data was stored. Airbag24 removes the crash data during the repair.

The other causes lie in the electronics and their connections. Whether they apply is shown by the inspection on the test bench.

How can you tell that the 89170-BZ611 is defective?

The airbag warning light lights up permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool receives no connection to the control unit, and the fault memory cannot be cleared.

These signs indicate a defect. In the event of a defect, the airbags and seatbelt pretensioners may possibly not deploy in an emergency, so the system should be checked promptly.

Which vehicles is the 89170-BZ611 fitted in?

The control unit 89170-BZ611 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The following lists the vehicles in which this control unit is fitted:

• Toyota Avanza F650 Facelift (2015-2023)

Compare the part number on the label of the unit with this page; that only confirms the unit. Have the fault memory read out beforehand. Only its contents show whether the control unit is defective or whether a plug or cable is causing the fault.

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-BZ611 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Create the repair order online and send the well-packed unit in. Processing usually takes 3–4 working days.

The unit is inspected, defective components are replaced, the crash data is erased and a functional test is carried out. Afterwards your own unit is sent 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-BZ611 get to Airbag24?

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

The printed repair order belongs in the parcel, and the unit must be packed shockproof.