Airbag control unit with part number 89170-BZ780

What does the airbag control unit 89170-BZ780 do?

The airbag control unit 89170-BZ780 brings together the restraint system (SRS) of Toyota. It reads out the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners fire, and monitors the system continuously.

A detected fault appears on the airbag warning light in the instrument cluster.

After an accident, the control unit creates crash data and locks itself.

Why does the control unit 89170-BZ780 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the unit until it is erased during the repair. The diagnostic tool is not sufficient for this, which is why this entry cannot be removed by yourself.

Aged components and cold solder joints can cause faults even without an accident.

Moisture and corrosion affect the contact at plug connections. Voltage spikes, for example from a weak battery, put additional strain on the electronics.

How can you tell that the 89170-BZ780 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. Fault messages appear in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

In everyday use, the airbag warning light is the first thing you notice. It signals a fault before you notice anything else.

A connection that cannot be established with the diagnostic tool points to a fault in the control unit or its wiring. You should take such signs seriously.

Which vehicles is the 89170-BZ780 fitted in?

The airbag control unit 89170-BZ780 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The following shows the vehicles recorded for this part number.

• Toyota Avanza F650 Facelift (2015-2023)

Comparing the part number on the label of your removed unit with this page confirms that it is the correct unit. However, have the fault memory read out beforehand: only the log shows whether the control unit is defective or whether 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-BZ780 work?

You have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit 89170-BZ780. Then you create a repair order online and send the well-packed unit in; Airbag24 checks, repairs, erases the crash data and tests the unit.

Processing at Airbag24 usually takes 3–4 working days and comprises only checking, repairing and testing. Only then is your own unit 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-BZ780 get to Airbag24?

You send the control unit 89170-BZ780 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends your own unit back by UPS.

Put the printed repair order into the parcel and pack the control unit shockproof.