Airbag control unit with part number 89170-F4240

What does the airbag control unit 89170-F4240 do?

The airbag control unit 89170-F4240 belongs to the restraint system (SRS) of the Toyota. It reads the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners fire, and checks the system continuously.

The unit shows faults via the airbag warning light in the instrument cluster, so that you see a fault early.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-F4240 fail?

The most common cause is stored crash data from an accident, even if no airbag has deployed. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the unit because an ordinary diagnostic tool cannot clear it. As a result a fault can still be displayed long after the accident.

The other causes mainly relate to age and environmental influences. Electronic components lose reliability over time, and moisture and corrosion attack the plug connections.

Voltage spikes, for example from a weak battery or a jump start, can also be the trigger. Airbag24 removes the crash data during the repair.

How can you tell that the 89170-F4240 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, and the diagnostic tool has no connection to the control unit. In addition, the fault memory cannot be cleared.

Typical signs at a glance:

• Airbag warning light, permanently or intermittently
• Error message in the instrument cluster
• No connection to the control unit via the diagnostic tool
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not be able to deploy as a result. The warning light is therefore a sign to have checked promptly.

Which vehicles is the 89170-F4240 fitted in?

The 89170-F4240 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The list below shows the vehicles recorded for this part number.

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

First compare the number on the label of the removed unit with this page. This only ensures that you have the correct unit. Also have the fault memory read out before removal, because only the result shows whether the control unit is defective or whether a plug or a 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-F4240 work?

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

This sequence is mandatory for safety reasons and must not be swapped.

Airbag24 checks the unit on the test bench, replaces defective components, clears stored crash data and carries out a function test. Your own unit is then returned 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-F4240 get to Airbag24?

You send the control unit 89170-F4240 as a parcel, or it is collected by UPS for an extra charge. After the repair the unit is delivered back to you by UPS from Airbag24.

Enclose the printed repair order and pack the unit shock-resistant.