Airbag control unit with part number 89170-BZ620

What does the airbag control unit 89170-BZ620 do?

In the Toyota, the airbag control unit 89170-BZ620 is the central control unit of the SRS. It checks the crash sensors, decides on triggering within milliseconds in an accident, and monitors the system continuously.

This includes the wiring. If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident it stores crash data and is locked afterwards.

Why does the control unit 89170-BZ620 fail?

Stored crash data is the most common cause, even if no airbag has deployed. Ageing components, moisture or voltage spikes can also cause the failure.

A normal diagnostic tool cannot erase the crash data. It remains in the memory, even if the vehicle is then driven normally.

The other causes concern ageing, cold solder joints and corrosion on the contacts. Voltage spikes occur, for example, with a weak battery or jump-starting.

How can you tell that the 89170-BZ620 is defective?

The airbag warning light in the instrument cluster indicates a defect, either permanently or intermittently. Further signs include connection problems with the diagnostic tool and a fault memory that cannot be cleared.

• Warning light stays on permanently or keeps coming on
• Fault message in the display
• Diagnostic tool cannot establish a connection
• Fault memory remains

As long as the fault exists, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency. Do not ignore the warning light.

Which vehicles is the 89170-BZ620 fitted in?

The 89170-BZ620 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The overview of the vehicles is here:

• Toyota Avanza F650 Facelift (2015-2023)

Compare the part number of the removed unit with this page, and then you know that it is the right unit. In addition, have the fault memory read out: only this log shows whether the control unit is defective or whether plugs or cables are 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-BZ620 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit, create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, defective components are renewed, the crash data is erased and a function test is carried out. Testing, repairing and checking usually takes 3–4 working days there. Afterwards your own unit is returned to you.

The order of the first steps serves your safety and is therefore binding. 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-BZ620 get to Airbag24?

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

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