Airbag control unit with part number 89170-0C571

What does the airbag control unit 89170-0C571 do?

The airbag control unit 89170-0C571 manages the restraint system (SRS) of Toyota. It evaluates the crash sensors, determines in an accident within milliseconds the triggering of airbags and seatbelt pretensioners, and checks the system constantly for faults.

It reports faults found via the airbag warning light. After an accident it also stores crash data, and then locks itself.

Why does the control unit 89170-0C571 fail?

For the 89170-0C571, the most common cause is crash data stored after an accident, even if no airbag was deployed. A normal diagnostic tool does not delete it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The entry in the memory remains even if the vehicle drives inconspicuously after the accident. That is why the fault stays visible even when nothing more is noticeable on the car.

The other causes tend to act gradually. Aged components, cold solder joints, and moisture and corrosion at the plugs lead to problems over time. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the 89170-0C571 is defective?

The defect in the 89170-0C571 is first indicated by the airbag warning light, which lights up intermittently or permanently. A fault message in the instrument cluster is added. Airbags and seatbelt pretensioners may fail to deploy in an emergency.

The light gives indications you should not ignore if it does not go out again after the ignition is switched on. The same applies if the diagnostic tool cannot establish a connection.

A fault memory that cannot be emptied also points to a fault that needs to be clarified. Which part is affected only becomes clear during the check.

Which vehicles is the 89170-0C571 fitted in?

The control unit 89170-0C571 is fitted in these vehicles: Toyota Tundra K30 (2007-2021). Only the log of the read-out fault memory shows whether it is defective.

The list of vehicles in bullet points:

• Toyota Tundra K30 (2007-2021)

A comparison of the part number on the label with this page confirms that you have the right unit. Have the fault memory read out before removal as well, because it shows whether the control unit is defective or a connector or cable is involved.

For the same vehicles, we also repair control units with the part numbers 89170-0C440, 89170-0C450, 89170-0C451, 89170-0C452, 89170-0C490, 89170-0C581.

How does the repair of the 89170-0C571 work?

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

The sequence is mandatory for safety reasons. Removal takes place only after the battery has been disconnected.

On the test bench Airbag24 examines the unit, renews defective components, deletes the stored crash data and carries out a function test. Afterwards your own 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 89170-0C571 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair you receive the control unit 89170-0C571 back by UPS.

Place the printed repair order in the parcel and make sure the unit is packed shock-resistant.