Airbag control unit with part number 89170-0N050

What does the airbag control unit 89170-0N050 do?

The airbag control unit 89170-0N050 is the central component of the airbag system in Toyota. It monitors the sensors, decides within milliseconds in a crash whether to trigger airbags and seatbelt pretensioners, and reports faults via the airbag warning light.

The unit works on every journey without you noticing it. In doing so, it continuously checks the power supply, connections and signals.

If an accident has occurred, the device secures the crash data and switches into a locked state.

Why does the control unit 89170-0N050 fail?

Crash data from a previous accident is the most common cause, even without an airbag having been triggered; a normal diagnostic tool does not erase it. In addition, ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes can affect the unit.

The fact that no airbag has fired does not rule out stored data. The data sits directly in the control unit and is not visible from outside.

The other causes tend to act gradually. Wear on components, damp connectors and voltage dips strain the electronics over a longer period.

How can you tell that the 89170-0N050 is defective?

A defect shows up as an airbag warning light that stays on permanently or intermittently, and as an error message in the instrument cluster. In addition, the diagnostic tool cannot find the control unit, and the fault memory remains occupied. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The signs in detail:

• Warning light in the instrument cluster stays on permanently
• Warning light comes on intermittently
• Message in the instrument cluster indicates a fault
• Diagnostic tool does not establish a connection to the control unit
• Fault memory cannot be cleared

Such signs are a warning, even if the vehicle continues to drive. A check is the right next step.

Which vehicles is the 89170-0N050 fitted in?

The airbag control unit 89170-0N050 is fitted in these vehicles: Toyota Crown S210 (2012-2018).

The overview lists the vehicles recorded for this control unit in our records.

• Toyota Crown S210 (2012-2018)

Compare the part number on the removed unit with this page. This confirms that you have the correct unit, but not that it is defective. For that you need the read-out fault memory, because it shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-30J00.

How does the repair of the 89170-0N050 work?

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

At Airbag24 the unit is checked, defective components are replaced, the crash data is deleted and the function is tested. Afterwards your own unit is 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 89170-0N050 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns the control unit by UPS after the repair. Put the printed repair order in the parcel and pack the unit shockproof.

Stable packaging means: sturdy cardboard, padding all round and nothing loose inside.