Airbag control unit with part number 89170-07540

What does the airbag control unit 89170-07540 do?

The airbag control unit 89170-07540 controls the restraint system (SRS) of Toyota. It evaluates crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. At the same time it monitors all components and reports faults via the airbag warning light.

This monitoring is an ongoing task that takes place during every journey, without the driver having to do anything for it.

After an accident the unit stores crash data and locks itself. The repair is the only way to lift this lock.

Why does the control unit 89170-07540 fail?

The most common cause is crash data from an earlier accident, even if no airbag was triggered. A diagnostic tool cannot remove this data. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, as with a weak battery or a jump start.

Electronic components age, and their solder joints can become brittle over time. Moisture acts especially on plugs, where corrosion forms and disturbs the contact.

Airbag24 deletes the crash data during the repair, so this fault is dealt with as part of the order.

How can you tell that the 89170-07540 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

With this fault, airbags and seatbelt pretensioners may not trigger in an emergency. The indication should therefore be taken seriously.

Which vehicles is the 89170-07540 fitted in?

The control unit 89170-07540 is fitted in these vehicles at Toyota: Toyota Avalon XX50 Facelift (from 2022) and XX50 (2018-2022).

These vehicles are recorded for this part number:

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

A comparison of the part number on the label of the removed unit with this page only confirms that you have the correct unit. Whether the control unit itself is defective or a plug or cable is the cause is shown only by reading out the fault memory.

How does the repair of the 89170-07540 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Afterwards create the repair order online and send the unit in well packed. Airbag24 repairs the assembly and returns your own unit.

The sequence is mandatory to keep the vehicle safe. Removal may therefore only take place after the readout and the disconnection of the battery.

Airbag24 examines the unit on the test bench, replaces defective components in a targeted way, deletes stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. 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 89170-07540 get to Airbag24?

You send the unit as a package or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Enclose the printed repair order in the package, and pack the unit shock-resistant.