Airbag control unit with part number 89170-07320

What does the airbag control unit 89170-07320 do?

The airbag control unit 89170-07320 controls the restraint system (SRS) for Toyota. It continuously checks the signals from the crash sensors, decides in an emergency which airbags and seatbelt pretensioners are triggered, and indicates faults via the airbag warning light. After an accident it stores crash data and locks itself.

Evaluation happens in fractions of a second as soon as an impact is detected. The self-monitoring runs in operation and records anomalies in the fault memory.

Why does the control unit 89170-07320 fail?

Stored crash data is the most common cause on the 89170-07320, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Further causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data are entries in the memory of the unit and not damage to the component. The other causes concern mainly the electronics themselves and their connections, regardless of whether an accident has occurred.

How can you tell that the 89170-07320 is defective?

A defect on the 89170-07320 shows as an airbag warning light that lights up permanently or intermittently in the instrument cluster, or as a fault message in the instrument cluster. A missing connection of the diagnostic tool and a fault memory that cannot be erased also point to it. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The signs in detail:

• Control light in the instrument cluster on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not reach the control unit
• Fault memory cannot be erased

Making the cause visible is the task of the read-out, not of the signs alone.

Which vehicles is the 89170-07320 fitted in?

The 89170-07320 is installed in these vehicles: Toyota Avalon XX40 (2012-2015) and XX40 Facelift (2015-2018).

The vehicles for which this part number is recorded are listed one below the other here:

• Toyota Avalon XX40 (2012-2015)
• Toyota Avalon XX40 Facelift (2015-2018)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit. Have the fault memory read out beforehand, because only this shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-07350, 89170-07480.

How does the repair of the 89170-07320 work?

First have the fault memory read out and enclose the log; then disconnect the battery and only then remove the 89170-07320. Next create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days as a rule for checking, repairing and testing.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and runs a function test. Afterwards your own unit goes back 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 89170-07320 get to Airbag24?

You send the 89170-07320 as a parcel to Airbag24, or you book a UPS collection for an extra charge. The return of your own unit is made by UPS.

The printed repair order belongs in the parcel, and you pack the unit shock-resistant.