Airbag control unit with part number 89170-BZ800

What does the airbag control unit 89170-BZ800 do?

In the vehicle of Toyota, the airbag control unit 89170-BZ800 takes over the control of the restraint system (SRS). It reads the impact sensors, determines in an emergency which airbags and seatbelt pretensioners are triggered, and checks the system continuously. If it detects a fault, it reports this via the airbag warning light.

A crash causes crash data to be stored in the unit. The control unit then remains locked until a repair lifts the lock.

In operation it is not visible. Its benefit only becomes apparent when something is wrong, because then it issues the warning.

Why does the control unit 89170-BZ800 fail?

Crash data stored after an accident is the most common cause of a failure, even if no airbag was triggered. A normal diagnostic tool cannot erase it. In addition, aged electronic components, cold solder joints, moisture and corrosion in plug connectors, and voltage spikes come into question.

It often surprises owners at first that crash data arises at all without any visible damage.

The other causes tend to be gradual. Ageing and moisture change contacts over time, whereas voltage spikes occur suddenly, for example with a weak battery or a jump start.

How can you tell that the 89170-BZ800 is defective?

The most important sign is the airbag warning light, which stays on permanently or intermittently. Error messages in the instrument cluster may accompany it, the diagnostic tool does not connect with the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

A fault stays in the memory even if the light only comes on now and then. It is precisely this repetition that is a reason to have the cause clarified.

In addition, the diagnostic tool shows whether the control unit can be reached at all.

Which vehicles is the 89170-BZ800 fitted in?

The 89170-BZ800 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The list below shows the vehicles known to us for this control unit.

• Toyota Avanza F650 Facelift (2015-2023)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Whether the control unit itself is defective can only be judged with the fault memory read out in advance, because a plug or a cable can be the cause just as well.

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-BZ800 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next create a repair order online and send the unit in well packed. Processing at Airbag24 generally takes 3–4 working days.

At Airbag24 the unit is checked, defective components are replaced where necessary, the crash data is erased and a functional test is carried out. Afterwards your own control unit goes 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-BZ800 get to Airbag24?

You hand the control unit in as a parcel, or you book a UPS collection for an extra charge. Returns after the repair are made by UPS.

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