Airbag control unit with part number 89170-F4490

What does the airbag control unit 89170-F4490 do?

The airbag control unit 89170-F4490 coordinates the safety systems for emergencies at Toyota. Based on the crash sensors, it determines within fractions of a second in an accident which airbags and seatbelt pretensioners are triggered.

While driving, it monitors the system and reports faults via the airbag warning light in the instrument cluster. In this way the state of the system remains traceable.

After an accident it secures crash data and then locks itself. What this step means for the repair is explained in the following sections of this page.

Why does the control unit 89170-F4490 fail?

The most common cause is stored crash data, even if no airbag has triggered. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a common diagnostic tool, so it remains in the memory. The repair at Airbag24 therefore also includes erasing this data.

The other causes concern the condition of the components and their environment. Electronics age, solder joints can weaken, and moisture attacks contacts. Voltage spikes from the vehicle electrical system, for example from jump-starting, also belong here.

How can you tell that the 89170-F4490 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition the instrument cluster displays fault messages, the diagnostic tool cannot establish a connection and the fault memory cannot be cleared.

Such a finding means that airbags and seatbelt pretensioners may not trigger in an emergency. This applies regardless of how well the vehicle otherwise runs.

Do not leave the warning unattended; have the system checked promptly.

Which vehicles is the 89170-F4490 fitted in?

The vehicle registration document is the most reliable way to determine whether your own car is included. The 89170-F4490 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

Here is the list of vehicles stored for this part number:

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

Comparing the part number on the label of the removed unit with this page merely confirms that it is the right unit. Afterwards have the fault memory read out. Only this result 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-F4490 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the unit. Then create a repair order online and pack the unit well for sending.

At Airbag24 the unit is checked on the test bench. Defective components are repaired, crash data is erased and a function test is carried out.

Processing at Airbag24 usually takes 3–4 working days, and this time applies only to checking, repairing and testing. Afterwards you receive your own unit 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-F4490 get to Airbag24?

You send the control unit 89170-F4490 as a parcel or optionally book a UPS collection. After the repair Airbag24 sends it back to you by UPS.

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