Airbag control unit with part number 89170-BZA80

What does the airbag control unit 89170-BZA80 do?

The airbag control unit 89170-BZA80 is the SRS control unit of Toyota: it processes the signals of the crash sensors, selects the appropriate airbags and seatbelt pretensioners in an accident within milliseconds, and monitors the entire system.

If it detects a fault, the airbag warning light in the instrument cluster lights up.

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

Why does the control unit 89170-BZA80 fail?

Crash data from an accident is the most frequent cause of a failure, even when no airbag has deployed at all. A standard diagnostic tool cannot get at it. Other 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 removed. At Airbag24 this happens during the repair.

Aged electronic components and cold solder joints are causes that can occur even without an accident.

Moisture and corrosion at plug connections impair the contact. Voltage spikes, for example from a weak battery or jump-starting, can also affect the control unit.

How can you tell that the 89170-BZA80 is defective?

If the airbag warning light in the instrument cluster comes on permanently or intermittently, there is a fault. Fault messages accompany it, the diagnostic tool finds no access, and the fault memory persists. In an emergency, airbags and seatbelt pretensioners may possibly fail to deploy.

• Airbag warning light permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool cannot find the control unit
• Fault memory cannot be emptied

The warning in the instrument cluster is one of the indications you should not ignore. It shows that the restraint system is not working without faults.

Which vehicles is the 89170-BZA80 fitted in?

The airbag control unit 89170-BZA80 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The vehicles in the following overview belong to this part number.

• Toyota Avanza F650 Facelift (2015-2023)

Matching the part number on the removed unit with this page confirms that you have the right unit. What matters for the cause, however, is the fault memory, which you have read out beforehand, because it shows whether the control unit is defective or whether a plug or cable is affected.

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-BZA80 work?

You have the fault memory read out, enclose the log, disconnect the battery and only then remove the control unit 89170-BZA80. At Airbag24, checking, repairing and testing take 3–4 working days as a rule.

You create the repair order online, then send the well-packed unit in. Airbag24 examines it on the test bench, repairs the defective components, erases the crash data and carries out a function test.

Only then does your own unit go back 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-BZA80 get to Airbag24?

You can send a parcel containing the control unit 89170-BZA80 yourself or have it collected by UPS for an extra charge. Airbag24 brings the repaired unit back to you by UPS.

The printed repair order belongs in the packaging, which should be shockproof.