Airbag control unit with part number 89170-BZA10

What does the airbag control unit 89170-BZA10 do?

The airbag control unit 89170-BZA10 is the control centre of the restraint system (SRS) at Toyota. It analyses the signals from the crash sensors and decides in an emergency which airbags and seatbelt pretensioners are triggered.

The unit monitors the system continuously and shows faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-BZA10 fail?

The most common cause with the 89170-BZA10 is that crash data stored after an accident remain in the unit, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Other causes are ageing electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data stay in the memory until they are erased during the repair.

Ageing components and cold solder joints can impair the function of the control unit.

Moisture and corrosion attack plug connectors, and voltage spikes, as caused by a weak battery or a jump start, stress the electronics.

How can you tell that the 89170-BZA10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the 89170-BZA10 is defective. Additionally, a fault message may appear in the instrument cluster, or the diagnostic tool cannot find the control unit. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

A fault memory that cannot be emptied despite erasing attempts also indicates the problem.

Follow up on this sign promptly and have the system checked.

Which vehicles is the 89170-BZA10 fitted in?

The control unit 89170-BZA10 is found at Toyota in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The vehicles for this part number are given in the following overview.

• Toyota Avanza F650 Facelift (2015-2023)

Compare the part number on the label of the removed unit with this page, as this only clarifies whether you have the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or a plug or cable is the cause.

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-BZA10 work?

First you read out the fault memory and attach the log, then you disconnect the battery. Then you remove the control unit 89170-BZA10, create a repair order online and pack it well before sending it in. Processing at Airbag24 generally takes 3–4 working days.

Airbag24 checks the unit, repairs defective components, erases stored crash data and carries out a function test. Your own unit is then returned.

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-BZA10 get to Airbag24?

You send the control unit 89170-BZA10 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-proof.