Airbag control unit with part number 89170-F4580

What does the airbag control unit 89170-F4580 do?

The airbag control unit 89170-F4580 belongs to the restraint system (SRS) of Toyota and has the task of triggering the correct airbags and seatbelt pretensioners in a crash. To do this, it evaluates the signals from the crash sensors and monitors the system during operation.

It detects faults continuously and reports them via the airbag warning light. At the same time it records deviations in the fault memory so that a workshop can trace them.

After an accident it secures crash data and then locks itself.

Why does the control unit 89170-F4580 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; these cannot be erased with a normal diagnostic tool. Further causes are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the memory until it is removed during the repair. The unit keeps it even if the vehicle then continues to drive without any noticeable problem.

The other causes act gradually. Ageing components and corroded contacts gradually worsen the connection, and voltage spikes from a weak battery or jump-starting can damage components.

How can you tell that the 89170-F4580 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

The airbag warning light is the most important warning signal in everyday use. If it does not go out after the ignition is switched on or comes on while driving, have the system checked.

A missing connection to the diagnostic tool is also a warning sign you should take seriously.

Which vehicles is the 89170-F4580 fitted in?

The airbag control unit 89170-F4580 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The list shows the vehicles for which this unit is intended.

• Toyota C-HR NGX10 Facelift (2019-2023)

Comparing the part number on the label with this page only shows that you have the correct unit. Whether the control unit is defective or a plug or cable is the cause is shown by the fault memory, which you should have read out before removal.

For the same vehicles, we also repair control units with the part numbers 89170-F4210, 8917010110.

How does the repair of the 89170-F4580 work?

First read out the fault memory and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, replaces defective components, erases crash data and carries out a function test. Afterwards your own unit comes 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-F4580 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order and pack the unit shockproof.