Airbag control unit with part number 89170-F4480

What does the airbag control unit 89170-F4480 do?

The airbag control unit 89170-F4480 is the control unit of the restraint system (SRS) in Toyota vehicles. In a crash, it decides on the basis of the sensor values which airbags and seatbelt pretensioners are triggered.

The evaluation takes place in a fraction of a second. In everyday use, the unit monitors the entire system and reports faults via the airbag warning light.

After an accident, it stores crash data and locks itself. This state is part of the unit's behaviour and must be taken into account during diagnosis.

Why does the control unit 89170-F4480 fail?

The most common cause is stored crash data, even if no airbag was triggered in the accident. A normal diagnostic tool cannot erase it, so the fault remains in the system.

Airbag24 removes this crash data during the repair. This cannot be done with a simple workshop tool.

Otherwise, electronic components age, and soldered joints can go cold. Moisture and corrosion at plug connections also disturb the contact. Voltage spikes, for example from a weak battery or a jump start, can also damage the electronics.

How can you tell that the 89170-F4480 is defective?

A defect shows up through the airbag warning light in the instrument cluster, which stays on permanently or only intermittently, and through a fault message. A diagnostic tool without a connection to the control unit, or a fault memory that cannot be emptied, also indicates a problem.

Anyone who overlooks or ignores the light loses valuable time. Checking the fault memory quickly brings clarity.

As long as the fault exists, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Which vehicles is the 89170-F4480 fitted in?

The control unit 89170-F4480 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The list below shows the vehicles that are assigned to this control unit in our records.

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

Before removal, the fault memory should be read out. Then compare the part number on the label of the removed unit with the number on this page, so that you can be sure the control unit and not a cable is affected.

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

How does the repair of the 89170-F4480 work?

You read out the fault memory, enclose the log, disconnect the battery and remove the control unit. Then create a repair order online and send the unit in.

Removing the unit involves loosening it carefully from the vehicle. After that, pack it well so that nothing is damaged in transit.

Airbag24 checks the submitted unit on the test bench, replaces defective components and erases the stored crash data. A function test follows, and then your own unit goes back. 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-F4480 get to Airbag24?

You hand in the unit in a parcel or have it collected by UPS for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

Put the printed repair order in the parcel and pack the control unit shockproof.