Airbag control unit with part number 89170-BZ810

What does the airbag control unit 89170-BZ810 do?

The airbag control unit 89170-BZ810 controls the restraint system of Toyota. It evaluates the signals from the crash sensors, decides within fractions of a second in an accident whether to trigger, and monitors the system continuously. It reports faults via the airbag warning light.

The measured values reach the unit without interruption, and the evaluation runs in the background. This forms the basis of the triggering decision.

After an accident it stores crash data and locks itself. Please have a reported fault checked promptly.

Why does the control unit 89170-BZ810 fail?

On the 89170-BZ810, the most common cause after an accident is stored crash data, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the memory after an accident, even if airbags and seatbelt pretensioners were not affected. A standard diagnostic tool cannot remove it.

Electronics age over time. Cold solder joints, moisture and corrosion on plugs, as well as voltage spikes in the vehicle electrical system, for example with a weak battery or a jump start, can also trigger faults. Which cause applies in an individual case is only established by the inspection.

How can you tell that the 89170-BZ810 is defective?

A defect in the 89170-BZ810 is indicated by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Also present are a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

Typical signs are:

• warning light permanently or intermittently on
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may not trigger in an emergency. The warning applies even if the vehicle appears unremarkable in everyday use.

Which vehicles is the 89170-BZ810 fitted in?

The control unit 89170-BZ810 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The fitment covers the following models:

• Toyota Avanza F650 Facelift (2015-2023)

Compare the part number on the label of the removed unit with this page, as this only confirms that you have the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit 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 17952812-928112, 17952815-928143, 89170-BZ440.

How does the repair of the 89170-BZ810 work?

For the 89170-BZ810, first have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Airbag24 usually needs 3–4 working days for inspection, repair and function test.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards your own 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-BZ810 get to Airbag24?

You send the control unit 89170-BZ810 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-resistant.