Airbag control unit with part number 89170-BZ750

What does the airbag control unit 89170-BZ750 do?

The airbag control unit 89170-BZ750 coordinates the restraint system (SRS) in Toyota. It processes the crash sensor data, determines in an accident which airbags and seatbelt pretensioners trigger, and monitors the system. After an accident, it stores crash data and locks itself.

The signals from the crash sensors arrive at the unit and are evaluated within milliseconds. The result determines which restraint devices trigger. In addition, the unit monitors its own function, and faults appear on the airbag warning light.

As long as nothing happens, the control unit goes unnoticed in everyday driving.

Why does the control unit 89170-BZ750 fail?

The most common cause for the control unit 89170-BZ750 is crash data from an accident, which can be present even if no airbag has deployed. Also responsible can be ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A standard diagnostic tool cannot erase crash data. Airbag24 removes this point during the repair.

The electronics themselves are sensitive. Components wear out over time, solder joints can go cold, and moisture causes corrosion at plug connections. Voltage spikes from the vehicle electrical system, for example with a weak battery or a jump start, are another possible cause.

How can you tell that the 89170-BZ750 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently when something is wrong with the 89170-BZ750. An error message in the instrument cluster, a diagnostic tool that cannot reach the control unit, or a fault memory that stays on confirm the suspicion. In an emergency, airbags and seatbelt pretensioners may not deploy.

A warning light that stays on or comes on intermittently deserves a prompt check. Even if the car can still be driven normally, the restraint system remains unreliable in this state.

Which vehicles is the 89170-BZ750 fitted in?

The control unit 89170-BZ750 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The vehicles in which this unit was installed are listed here:

• Toyota Avanza F650 Facelift (2015-2023)

If the part number on the label matches this page, the unit is the right one. Before you remove the unit, have the fault memory read out. Only that result 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-BZ750 work?

For the 89170-BZ750, first have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create the repair order online and send the unit in.

Airbag24 checks the control unit on the test bench, repairs defective components, erases the crash data and runs a function test. Processing usually takes 3–4 working days. The unit then comes 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-BZ750 get to Airbag24?

You send the control unit 89170-BZ750 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Enclose the printed repair order with the parcel and pack the control unit in a shock-proof way.