Airbag control unit with part number 89170-BZ680

What does the airbag control unit 89170-BZ680 do?

The airbag control unit 89170-BZ680 forms the control of the restraint system (SRS) in Toyota. Via the crash sensors it records the deceleration in an impact and decides which airbags and seatbelt pretensioners are triggered.

During continuous operation it checks the chain of sensors and wiring. If it detects a fault, the airbag warning light in the instrument cluster shows it.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-BZ680 fail?

The most common cause is stored content from an accident: crash data saved even without a deployed airbag. A standard diagnostic tool cannot remove this data. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The data remains in the unit until it is deleted during the repair.

Ageing components and faulty solder joints count among the other causes, as do damp and rust on plug connections.

Voltage spikes, for example from a weak battery or a jump start, round off the picture.

How can you tell that the 89170-BZ680 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. An error message appears in the instrument cluster, and the diagnostic tool makes no connection to the control unit 89170-BZ680. The fault memory cannot be cleared, and the airbags and seatbelt pretensioners may not trigger in an emergency.

The light is the first sign that something is wrong in the system.

Whether the control unit itself or the wiring is affected cannot be determined without a readout.

Which vehicles is the 89170-BZ680 fitted in?

According to the assignment, this unit 89170-BZ680 is fitted in: Toyota Avanza F650 Facelift (2015-2023).

The assignment is listed below.

• Toyota Avanza F650 Facelift (2015-2023)

Compare the number on the label of the removed unit with this page first. That only shows that you have the correct unit in front of you. Have the fault memory read out beforehand, because only this finding decides whether the control unit is defective or a connector 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-BZ680 work?

You read out the fault memory and keep the log. Then you disconnect the battery, and only after that do you remove the control unit 89170-BZ680. Finally you create the repair order online and send in the well-packed unit with the log enclosed.

Airbag24 checks the unit on the test bench and replaces defective components. The stored crash data is then deleted and a function test is carried out. Inspection, repair and function test at Airbag24 usually take 3–4 working days. Your own unit is returned to you afterwards.

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-BZ680 get to Airbag24?

You send the control unit 89170-BZ680 as a parcel, or book a UPS collection for an extra charge. The return to you after the repair is made by UPS.

Enclose the printed repair order and pack the unit shock-proof.