Airbag control unit with part number 89170-BZ650

What does the airbag control unit 89170-BZ650 do?

The airbag control unit 89170-BZ650 forms the central control unit of the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit shows faults via the airbag warning light in the instrument cluster. This monitoring runs without any intervention by the driver.

After a crash, it stores crash data and locks itself.

Why does the control unit 89170-BZ650 fail?

Stored crash data is the most common cause, even if no airbag has triggered. A normal diagnostic tool cannot erase it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or jump-starting.

The crash data remains in the memory after the accident, even if no airbag ignited. Airbag24 removes it during the repair.

Aged components and cold solder joints can disrupt operation without the fault becoming immediately obvious.

How can you tell that the 89170-BZ650 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the display. In addition, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger with such a defect. A lit warning light is therefore a reason to have the system checked promptly.

Which vehicles is the 89170-BZ650 fitted in?

The part number on the unit is decisive. The control unit 89170-BZ650 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The vehicles in which this control unit was installed are listed below.

• Toyota Avanza F650 Facelift (2015-2023)

First compare the part number on the label of the removed unit with this page; this only confirms that it is the right unit. Also have the fault memory read before removal. Only the log shows whether the control unit is defective or whether a connector 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-BZ650 work?

First you have the fault memory read and enclose the log; then you disconnect the battery and remove the control unit 89170-BZ650. Next, you create a repair order online and send the unit in well packed. Airbag24 usually processes it in 3–4 working days.

On the test bench, Airbag24 checks the unit, replaces defective components, erases stored crash data and tests the function. 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-BZ650 get to Airbag24?

You send the control unit 89170-BZ650 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

The printed repair order belongs in the parcel, and the packaging must protect the unit against impacts.