Airbag control unit with part number 89170-BZA20

What does the airbag control unit 89170-BZA20 do?

The airbag control unit 89170-BZA20 acts as the central control unit of the restraint system (SRS) for Toyota. It evaluates crash sensors, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and checks the system constantly.

Faults are indicated via the airbag warning light. After a crash the unit stores crash data and locks itself.

It is part of the safety-relevant electronics of the vehicle.

Why does the control unit 89170-BZA20 fail?

The most common cause is stored crash data after an accident, even without an airbag having triggered. Further causes are aged electronics, dry joints and corrosion on plug connectors.

A usual diagnostic tool cannot remove this data. Airbag24 erases it during the repair.

• Aged electronic components
• Dry joints
• Moisture or corrosion on plug connectors
• Voltage spikes, for example from a weak battery or jump-starting

The examination shows which of these causes applies to the unit removed.

How can you tell that the 89170-BZA20 is defective?

Signs of a defect are an airbag warning light in the instrument cluster, an error message, a diagnostic tool without connection to the control unit and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light is either permanently on or intermittent. It shows the current state of the system.

If the diagnostic tool cannot get through to the control unit, or the fault memory stays full despite an attempt to clear it, there is a fault that must be checked.

Which vehicles is the 89170-BZA20 fitted in?

The 89170-BZA20 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

These vehicles are on record for this part number:

• Toyota Avanza F650 Facelift (2015-2023)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Have the fault memory read out beforehand: only the log shows whether the control unit itself is defective or 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-BZA20 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the 89170-BZA20. Create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days for checking, repairing and testing.

Airbag24 examines the unit on the test bench, replaces defective components, erases crash data and carries out a function test. The 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-BZA20 get to Airbag24?

You send the 89170-BZA20 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

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