Airbag control unit with part number 89170-BZ340

What does the airbag control unit 89170-BZ340 do?

The airbag control unit 89170-BZ340 is the central control unit of the restraint system for Toyota. It processes the messages from the crash sensors, decides in an accident within milliseconds on the airbags and seatbelt pretensioners, and monitors the system continuously. Faults appear via the airbag warning light.

After an accident, the unit stores crash data and then locks itself. In normal driving, nothing of this is noticeable.

Why does the control unit 89170-BZ340 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; it cannot be removed with a normal diagnostic tool. Also involved are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from weak batteries or jump starting.

An airbag that does not deploy does not mean that no crash data has been created. Airbag24 erases this data during the repair.

The other triggers concern the electronics themselves and their connections. Whether they are present is shown only by the examination on the test bench.

How can you tell that the 89170-BZ340 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster, through the lack of connection to the diagnostic tool, and through a fault memory that cannot be cleared.

These signs are:

• The airbag warning light indicates a fault.
• A fault message appears in the instrument cluster.
• The diagnostic tool does not find the control unit.
• The fault memory remains.

In an emergency, airbags and seatbelt pretensioners may possibly not trigger in the event of a defect. Therefore, have the system checked if any of these signs appear.

Which vehicles is the 89170-BZ340 fitted in?

The control unit 89170-BZ340 is fitted in these vehicles: Toyota Avanza F650 (2011-2015).

The list shows the vehicles for which this control unit is on file:

• Toyota Avanza F650 (2011-2015)

Check the part number on the label of the removed unit against this page; this only makes sure you are securing the correct unit. Whether the control unit itself is defective or whether a plug or cable is the cause is shown by the fault memory read out beforehand.

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-BZ340 work?

You have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send in the well-packed unit.

Airbag24 examines the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days, after which you receive 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-BZ340 get to Airbag24?

The control unit reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.