Airbag control unit with part number 89170-F4010

What does the airbag control unit 89170-F4010 do?

The airbag control unit 89170-F4010 controls the restraint system (SRS) of Toyota as a central unit. It checks the signals from the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and shows detected faults via the warning light.

The control unit works in the background for as long as the vehicle is live. It stores irregularities in the fault memory, which a workshop later reads out with a diagnostic tool.

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

Why does the control unit 89170-F4010 fail?

The most common cause is crash data from an earlier accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting, are further possible causes.

The data stays in the unit until it is removed during the repair. This applies regardless of whether an airbag actually deployed.

The other causes tend to act gradually. Ageing components and corroded contacts worsen the connections over time, and voltage spikes can damage the electronics.

How can you tell that the 89170-F4010 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. In this state, airbags and seatbelt pretensioners may fail to deploy in an emergency.

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

A diagnostic tool that cannot establish a connection to the control unit is another sign you should take seriously.

Which vehicles is the 89170-F4010 fitted in?

The airbag control unit 89170-F4010 is fitted in these vehicles: Toyota C-HR NGX10 (2017-2019).

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

• Toyota C-HR NGX10 (2017-2019)

A label comparison only shows that you have the correct unit in front of you: compare the part number on the removed unit with this page. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory, which you should have read out beforehand.

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

How does the repair of the 89170-F4010 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit, before you create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days as a rule for testing, repairing and checking.

At Airbag24, qualified staff test the unit on the test bench, replace defective components, erase the crash data and carry 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-F4010 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.