Airbag control unit with part number 89170-BZ310

What does the airbag control unit 89170-BZ310 do?

The airbag control unit 89170-BZ310 forms the central control unit for the restraint system (SRS) of Toyota. From the signals of the crash sensors, it works out within milliseconds in an accident which airbags and seatbelt pretensioners are triggered.

It monitors the system permanently and shows detected faults via the airbag warning light.

Without this control unit, no one evaluates the sensors, which is why it is decisive for the function of the entire system. After an accident, it stores crash data and locks itself.

Why does the control unit 89170-BZ310 fail?

With the 89170-BZ310, the most frequent problem is crash data stored after an accident, even if no airbag has triggered. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

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

The other causes concern components and connections: electronics age, solder joints can go cold, and moisture attacks plug connectors.

Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the 89170-BZ310 is defective?

On the 89170-BZ310, the airbag warning light in the instrument cluster signals a fault as soon as it lights up permanently or intermittently. A fault message in the instrument cluster, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared also point to a problem.

If the warning light is on, airbags and seatbelt pretensioners may not trigger in an emergency.

In this case, have the system checked promptly rather than ignoring the warning.

Which vehicles is the 89170-BZ310 fitted in?

The 89170-BZ310 is fitted in these vehicles: Toyota Avanza F650 (2011-2015).

The list below shows the vehicles that are recorded for this part number in our data.

• Toyota Avanza F650 (2011-2015)

Compare the part number on the label with this page to make sure it is the right unit. This comparison says nothing about the condition. Reading out the fault memory before removal, on the other hand, shows whether the control unit 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-BZ310 work?

Repairing, checking and testing the 89170-BZ310 at Airbag24 usually takes 3–4 working days. Your own steps start with reading out the fault memory, including the log.

Then disconnect the battery, only then remove the control unit, create the repair order online and pack the unit well for dispatch.

Airbag24 checks the unit on the test bench, repairs defective components, erases crash data and carries out a functional test. Your own unit is then returned. 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-BZ310 get to Airbag24?

You send the control unit 89170-BZ310 as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

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