Airbag control unit with part number 89170-BZ670

What does the airbag control unit 89170-BZ670 do?

The airbag control unit 89170-BZ670 is the central unit of the restraint system (SRS) in Toyota. It processes the readings of the crash sensors and selects the airbags and seatbelt pretensioners to be triggered in an accident within milliseconds.

In addition, it monitors the system continuously and shows faults via the airbag warning light. This gives you a direct indication when something is wrong.

If it has registered an accident, it stores the crash data and locks itself.

Why does the control unit 89170-BZ670 fail?

At the control unit 89170-BZ670, the most common cause lies in crash data that remains in the memory after an accident, even if no airbag has been triggered. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A standard diagnostic tool cannot erase this crash data. The data therefore stays in the unit, even if the unit otherwise appears to be working.

Ageing components and cold solder joints lead to failures over time. Moisture and corrosion disrupt the contacts in the plug connections.

Voltage spikes, for example from a weak battery or when starting with a jump start, can damage the electronics.

How can you tell that the 89170-BZ670 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool does not find the control unit 89170-BZ670, and the fault memory cannot be cleared.

These signs indicate a defect directly. They must therefore be taken seriously and not postponed.

While the fault persists, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Which vehicles is the 89170-BZ670 fitted in?

The unit with the part number 89170-BZ670 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

Our data assigns the following vehicles:

• Toyota Avanza F650 Facelift (2015-2023)

On the one hand, compare the part number on the label of the removed unit with this page; this only checks whether it is the right unit. On the other hand, have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug or a 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-BZ670 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only after that remove the control unit 89170-BZ670.

Then create the repair order online and pack the unit well before sending it in. At Airbag24, the sent unit is checked on the test bench, defective components are replaced, the crash data is erased and a function test is carried out.

For this work at Airbag24, expect 3–4 working days as a rule; your own unit is then 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-BZ670 get to Airbag24?

Either you send the control unit 89170-BZ670 in as a parcel, or you book a UPS collection for an extra charge. The return of the unit after the repair is made by UPS.

Pack the unit shock-proof and enclose the printed repair order.