Airbag control unit with part number 89170-74100

What does the airbag control unit 89170-74100 do?

The 89170-74100 controls the restraint system of Toyota, short SRS. It evaluates the crash sensors, determines within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and blocks itself.

It works in the background and stays invisible in everyday use as long as there is no fault. If a fault occurs, it records it in the fault memory.

The airbag warning light informs the driver about the state of the system.

Why does the control unit 89170-74100 fail?

The most common cause lies in the crash data that remain in memory after an accident, even when no airbag has deployed. A normal diagnostic tool does not remove them from memory.

Crash data arise from an accident, and they stay in the unit. Reading them out changes nothing.

The other causes are technical in nature: age-related wear of electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from the vehicle electrical system. At Airbag24, crash data are erased during the repair.

How can you tell that the 89170-74100 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

If you observe any of these symptoms, arrange a check promptly.

A fault does not always occur continuously; the light may come on only under certain conditions. The light going out therefore does not prove that everything is in order.

Which vehicles is the 89170-74100 fitted in?

The 89170-74100 is fitted in these vehicles: Toyota iQ KGJ10 (2008-2015). Your part number is the point of reference here.

The models in detail:

• Toyota iQ KGJ10 (2008-2015)

Before you send the unit in, check these points. Comparing the part number on the label with this page confirms that you have the correct unit. Having the fault memory read out is the step that shows whether the control unit itself is defective or whether a plug or cable is responsible for the failure.

For the same vehicles, we also repair control units with the part numbers 150300-2193, 89170-74020, 89170-74140.

How does the repair of the 89170-74100 work?

You have the fault memory read out and attach the log before the battery is disconnected and the control unit is removed. Online you create the repair order, then you send the unit in well packed. At Airbag24, inspecting, repairing and testing usually take 3–4 working days.

The order protects you when working on the airbag system, so keep to it exactly.

Airbag24 checks the control unit on the test bench, replaces defective components, erases stored crash data and carries out a functional test. Afterwards the 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 89170-74100 get to Airbag24?

You can send the unit as a parcel or book a UPS collection for an extra charge. The return is made by UPS.

The printed repair order goes into the parcel, and the unit needs shock-proof packaging.