Airbag control unit with part number 89170-BZ470

What does the airbag control unit 89170-BZ470 do?

The airbag control unit 89170-BZ470 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

While driving, the unit monitors the entire restraint system continuously and works in the background. It reports faults via the airbag warning light in the instrument cluster, so that you notice the defect.

After an accident, the control unit stores crash data and then locks itself. This also applies to accidents in which no airbag was triggered.

Why does the control unit 89170-BZ470 fail?

For the 89170-BZ470, the most common cause is crash data stored after an accident, even if no airbag was triggered. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage peaks.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it during the repair.

Voltage peaks arise, for example, from a weak battery or jump-starting. Such loads can stress components inside the control unit and thus contribute to the failure.

How can you tell that the 89170-BZ470 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears there. If the 89170-BZ470 cannot be addressed by the diagnostic tool, or the fault memory cannot be cleared, a check is worthwhile.

The light therefore shows the defect directly. A stored fault stays in the fault memory and cannot simply be cleared.

In the event of a defect, airbags and seatbelt pretensioners may not trigger in an emergency. For that reason, take the warning light seriously and have the fault checked promptly.

Which vehicles is the 89170-BZ470 fitted in?

The control unit 89170-BZ470 is fitted in these vehicles: Toyota Avanza F650 (2011-2015). The assignment is shown on this page and can be matched against the label on the removed unit.

The following vehicles are assigned to the control unit:

• Toyota Avanza F650 (2011-2015)

First compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Also have the fault memory read out beforehand, because only this log shows whether the control unit itself 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-BZ470 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit 89170-BZ470. Afterwards create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a functional test. You then get your own unit back.

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-BZ470 get to Airbag24?

You send the control unit 89170-BZ470 as a parcel to Airbag24, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.