Airbag control unit with part number 89170-07391

What does the airbag control unit 89170-07391 do?

For Toyota, the airbag control unit 89170-07391 controls the SRS restraint system. It processes the signals from the crash sensors, triggers the appropriate airbags and seatbelt pretensioners in an accident, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The ongoing monitoring reports irregularities to the driver, namely via the airbag warning light in the instrument cluster.

Because the control unit coordinates triggering, a fault in it affects the entire restraint function, not just individual airbags.

Why does the control unit 89170-07391 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed. With the 89170-07391, a standard diagnostic tool cannot erase these data. Aged electronics, cold solder joints, moisture on plugs and voltage spikes are also possible causes, and Airbag24 erases the crash data during the repair.

Crash data remains stored in the control unit after an event, even if no airbag has deployed. Further causes include:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example with a weak battery or after a jump start

How can you tell that the 89170-07391 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when there is a defect in the 89170-07391. It is accompanied by a fault message in the instrument cluster. The diagnostic tool also finds no connection to the control unit, and the fault memory cannot be erased.

In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy. This warning should be checked promptly.

Which vehicles is the 89170-07391 fitted in?

The assignment depends on model and year of manufacture. The 89170-07391 is fitted in these vehicles: Toyota Avalon XX50 Facelift (from 2022) and XX50 (2018-2022).

The following list shows the vehicles recorded for it:

• Toyota Avalon XX50 Facelift (from 2022)
• Toyota Avalon XX50 (2018-2022)

The label on the removed unit bears a part number, which you compare with this page. This only confirms that it is the correct unit. Beforehand, have the fault memory read out, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-07391 work?

Before the control unit 89170-07391 is removed, have the fault memory read out and attach the log to the parcel. Once that is done, disconnect the battery and only then remove the unit. The repair order is created online, and the carefully packed unit is sent in.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, the repaired unit returns to you.

For processing at Airbag24, allow 3–4 working days as a rule. This figure refers only to checking, repairing and testing.

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 89170-07391 get to Airbag24?

You can send the control unit 89170-07391 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

A printed repair order goes into the parcel, and you pack the unit shock-proof.