Airbag control unit with part number 89170-BZ180

What does the airbag control unit 89170-BZ180 do?

The airbag control unit 89170-BZ180 is the central control unit of the restraint system (SRS) for Toyota. It processes the signals from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners in an accident. After an accident it stores crash data and locks itself.

The unit works in the background and continuously checks the sensors, the firing circuits and the lines to the restraint devices. This means the state of the system is always known.

Detected faults are stored in the fault memory and shown via the airbag warning light. Only the repair lifts the lock after an accident.

Why does the control unit 89170-BZ180 fail?

The most common cause is stored crash data that lies in the unit after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Added to this are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data stays in the memory until the repair removes it. That the data can be erased means for you: Airbag24 clears it as part of the repair, not beforehand.

Ageing components lose reliability over the years, and cold solder joints can give way under load. Moisture and corrosion disturb the contacts at the plug connections. Voltage spikes arise, for example, from a weak battery or from connecting a jump starter.

Which of these causes is actually present is shown only by the inspection.

How can you tell that the 89170-BZ180 is defective?

The airbag warning light in the instrument cluster lights permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

Typical signs are:

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

With such a finding, airbags and seatbelt pretensioners may fail to trigger in an emergency. Please have the system checked promptly.

Which vehicles is the 89170-BZ180 fitted in?

The control unit 89170-BZ180 is fitted in these vehicles: Toyota Avanza F650 (2011-2015).

These vehicles are known for this part number:

• Toyota Avanza F650 (2011-2015)

Compare the part number on the label of the removed unit with this page; this only ensures that you have the correct unit. Have the fault memory read out beforehand, because it shows whether the control unit itself is defective or whether a plug or cable causes the fault.

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-BZ180 work?

Have the fault memory read out first and enclose the log. Then disconnect the battery and only then remove the control unit. Online, create the repair order afterwards and send the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

The order is binding for safety reasons. Removal begins only once the log is available and the battery is disconnected.

At Airbag24 the unit is tested on the test bench, defective components are replaced, the crash data is erased and a function test is carried out. Afterwards your own unit is 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-BZ180 get to Airbag24?

You send the control unit 89170-BZ180 as a parcel or book a UPS collection for an extra charge. After the repair, it comes back to you by UPS.

The printed repair order goes in the parcel, and the unit is packed shock-resistant so that it survives transport undamaged.