Airbag control unit with part number 89170-F4280

What does the airbag control unit 89170-F4280 do?

As the SRS control unit, the airbag control unit 89170-F4280 controls the restraint system of Toyota. It reads the crash sensors, decides in a crash within a fraction of a second which airbags and seatbelt pretensioners are to be triggered, and keeps the system under constant watch.

Detected faults are shown on the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. In everyday driving the control unit goes unnoticed, because it works unseen in the background.

Why does the control unit 89170-F4280 fail?

The most common cause is crash data stored after an accident, even when no airbag has triggered; a normal diagnostic tool cannot erase it. Other causes include aged electronics, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data is stored in the unit and is not visible from outside. A vehicle can appear completely inconspicuous after an incident, although the control unit has already stored the data.

The other causes develop over time. Components age, solder joints can become brittle, moisture and corrosion attack the contacts, and voltage spikes stress the electronics.

How can you tell that the 89170-F4280 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and the instrument cluster shows a fault message. A diagnostic tool finds no connection to the control unit 89170-F4280, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light is not silent; it shows the fault. It is therefore worth taking the message seriously and acting promptly so that the system can be checked.

Which vehicles is the 89170-F4280 fitted in?

This control unit 89170-F4280 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The list of vehicles is here:

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

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

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

How does the repair of the 89170-F4280 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit 89170-F4280. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At the test bench, Airbag24 checks the unit, replaces defective components, erases the 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-F4280 get to Airbag24?

You send the control unit 89170-F4280 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.