Airbag control unit with part number 89170-F4520

What does the airbag control unit 89170-F4520 do?

The airbag control unit 89170-F4520 controls the restraint technology of Toyota, that is airbags and seatbelt pretensioners. The crash sensors are evaluated in an accident so quickly that the right restraint devices trigger in time.

During operation the unit checks the system continuously and reports faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 89170-F4520 fail?

The most common cause for the 89170-F4520 is crash data from an accident that stays in the memory even when no airbag was triggered, and that cannot be removed with a normal diagnostic tool. Aged electronics, cold solder joints, moisture and corrosion, and voltage spikes are also possible causes.

Crash data stays in the memory until Airbag24 erases it during the repair. The other triggers concern the electronics and their connections. Solder joints can go cold, plug connections suffer from moisture, and a weak battery or a jump start brings voltage spikes into the vehicle electrical system.

How can you tell that the 89170-F4520 is defective?

You recognise a defect on the 89170-F4520 by the airbag warning light in the instrument cluster, which stays on permanently or intermittently, or by an error message. A diagnostic tool that cannot connect, or a fault memory that cannot be cleared, also shows the finding. In such a case, airbags and seatbelt pretensioners may not trigger in an emergency.

As long as the finding exists, airbags and seatbelt pretensioners may not trigger in an emergency. The warning light is therefore a sign that justifies a check without delay.

Which vehicles is the 89170-F4520 fitted in?

Check whether the unit suits your vehicle using your vehicle papers. The 89170-F4520 is intended for Toyota and is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The list of vehicles is shown here:

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

Have the fault memory read out before you remove the control unit. The readout shows whether the control unit is defective or whether a plug or cable is affected. Then compare the part number on the label of the removed unit with this page, which only ensures that it is the right unit.

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

How does the repair of the 89170-F4520 work?

At the start is the readout of the fault memory; you enclose the log with the unit. Then you disconnect the battery and only then remove the 89170-F4520. The repair order is created online, after which you pack the unit well and send it in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, renews defective components, erases crash data and carries out a function test. Then your own unit is sent back.

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-F4520 get to Airbag24?

You send the control unit 89170-F4520 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return of your unit after the repair is handled by UPS.

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