Airbag control unit with part number 89170-F4290

What does the airbag control unit 89170-F4290 do?

The airbag control unit 89170-F4290 is the central SRS control unit for Toyota. It checks the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If the system detects a fault, the airbag warning light in the instrument cluster lights up. Monitoring covers the sensors, airbags, seatbelt pretensioners and the cables between them.

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

Why does the control unit 89170-F4290 fail?

Crash data stored after an accident is the most common cause, even if no airbag has been triggered. A standard diagnostic tool cannot delete it. Aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes can also be causes.

Airbag24 deletes this crash data during the repair. This is part of the regular process.

The other causes relate to the condition of the components or to the power supply. Solder joints on the circuit boards can become cold over time, moisture attacks connectors, and a weak battery or jump-starting can produce voltage spikes.

How can you tell that the 89170-F4290 is defective?

A defect on the 89170-F4290 shows in the airbag warning light, which stays on permanently or intermittently, and in a fault message in the instrument cluster. In addition, the diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared.

• The airbag warning light stays on permanently or intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool does not connect to the control unit.
• The fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may possibly not trigger. Have these indications checked promptly.

Which vehicles is the 89170-F4290 fitted in?

The control unit 89170-F4290 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023). The assignment is based on the part number of the unit.

The list shows the vehicles recorded for this part number.

• 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. Also have the fault memory read out beforehand, because only this result shows whether the control unit itself is affected or whether a connector 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-F4290 work?

Processing at Airbag24 usually takes 3–4 working days. First, have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Afterwards, send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, deletes the crash data and runs a function test. Your own unit is then returned to you.

This time applies exclusively to checking, repairing and testing at Airbag24.

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-F4290 get to Airbag24?

You send the control unit 89170-F4290 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-resistant.