Airbag control unit with part number 89170-F4440

What does the airbag control unit 89170-F4440 do?

The airbag control unit 89170-F4440 is the control unit of the SRS restraint system for Toyota. It checks the signals from the crash sensors and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

While driving, it monitors the entire system. If it detects a fault, it shows this via the airbag warning light.

After an accident, it stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 89170-F4440 fail?

On the 89170-F4440, crash data stored after an accident is the most common cause, even when no airbag has deployed. A normal diagnostic tool cannot erase it.

Other possible causes are aged electronic components, moisture and corrosion at plug connectors, and cold solder joints inside the unit.

Voltage spikes can also stress a control unit, for example when the battery is weakening or a jump start was needed.

How can you tell that the 89170-F4440 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the 89170-F4440 is faulty. In addition there are error messages in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared.

The warning light shows the defect. Do not rely on airbags and seatbelt pretensioners triggering in an emergency if such a finding is present.

Which vehicles is the 89170-F4440 fitted in?

The control unit 89170-F4440 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The vehicles in detail:

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

Compare the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Have the fault memory read out beforehand, because only this 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-F4440 work?

For the 89170-F4440, first have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed. At Airbag24, checking, repairing and function testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Your own unit then 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-F4440 get to Airbag24?

You send the control unit 89170-F4440 as a parcel or book a UPS collection for an extra charge. After the repair, it comes back to you by UPS.

The printed repair order goes into the parcel, and you pack the unit shock-proof.