Airbag control unit with part number 89170-35390

What does the airbag control unit 89170-35390 do?

In the Toyota vehicle, the airbag control unit 89170-35390 is responsible for controlling the SRS. Using the crash sensors, it works out which airbags and seatbelt pretensioners fire in an accident.

The calculation runs within milliseconds. The system is checked constantly during this, and faults appear via the airbag warning light.

An accident leaves crash data in the unit; after that it is locked.

Why does the control unit 89170-35390 fail?

Stored crash data is the most common cause of failure of the 89170-35390. It arises even without an airbag having deployed, and a normal diagnostic tool does not erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The fact that no airbag fired does not mean that nothing was stored.

The other causes concern electronics and connectors. Moisture and corrosion affect plug connections; a weak battery or jump-starting can produce voltage spikes.

How can you tell that the 89170-35390 is defective?

The airbag warning light in the instrument cluster, lit permanently or intermittently, indicates a defect in the 89170-35390. A fault message, a lack of contact with the diagnostic tool or a fault memory that cannot be cleared may accompany it.

In this state, airbags and seatbelt pretensioners may not deploy in an emergency.

A missing connection to the diagnostic tool also shows that something is wrong with the system.

Which vehicles is the 89170-35390 fitted in?

The 89170-35390 is fitted in these vehicles: Toyota FJ Cruiser GSJ15 (2006-2022).

The vehicles for which this part number is recorded are:

• Toyota FJ Cruiser GSJ15 (2006-2022)

Match the part number on the label of your removed unit with this page; then you know it is the right one. However, this says nothing about the cause. Only a read-out fault memory shows whether the control unit is defective or whether plugs or cables are the problem.

For the same vehicles, we also repair control units with the part numbers 89170-35300, 89170-35320, 89170-35380, 89170-35470.

How does the repair of the 89170-35390 work?

Have the fault memory read out, attach the log, then disconnect the battery. Only after that do you remove the 89170-35390 and create a repair order online. At Airbag24, checking, repair and function test usually take 3–4 working days.

Pack the unit well and send it in.

Airbag24 checks it on the test bench, replaces defective components, erases the crash data and carries out a function test. The unit then returns 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 89170-35390 get to Airbag24?

The control unit 89170-35390 goes to Airbag24 by parcel, or is collected via a UPS collection booked for an extra charge.

After repair, Airbag24 returns the unit by UPS. Include the printed repair order and pack the unit shock-resistant.