Airbag control unit with part number 89170-0C671

What does the airbag control unit 89170-0C671 do?

The airbag control unit 89170-0C671 is the control unit of the restraint system (SRS) in Toyota. It processes the crash sensor signals and, in the event of an accident, determines within milliseconds which airbags and seatbelt pretensioners are triggered.

It also checks the system during operation. It shows a detected fault via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-0C671 fail?

The most common cause is crash data stored after an accident, even if no airbag was deployed. A normal diagnostic tool cannot erase it, but Airbag24 deletes it during the repair. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data surprise many drivers, because the vehicle can carry on driving normally after the event. Nevertheless, the data remain in the unit until they are specifically erased.

The other causes develop gradually. Components age, solder joints give way and moisture attacks plug connections. Voltage spikes from the vehicle electrical system also damage the electronics.

How can you tell that the 89170-0C671 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, 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 not deploy.

The warning light remains the most important warning sign. It indicates a fault in the restraint system even if the vehicle otherwise drives normally.

Please have the finding checked promptly so that the cause can be established.

Which vehicles is the 89170-0C671 fitted in?

The airbag control unit 89170-0C671 is fitted in these vehicles: Toyota Tundra K40 (from 2021); Toyota Sequoia K30 (from 2022).

The known vehicles for this part number are listed below.

• Toyota Tundra K40 (from 2021)
• Toyota Sequoia K30 (from 2022)

(a) Compare the part number on the label of the removed unit with this page; this ensures that it is the correct unit. (b) Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a connector or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-34060.

How does the repair of the 89170-0C671 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send in the carefully packed unit. Airbag24 usually needs 3–4 working days for checking, repairing and testing.

This order protects you when working on the vehicle, which is why reading out comes first.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. The unit is then 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 89170-0C671 get to Airbag24?

You send the control unit 89170-0C671 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Place the printed repair order in the parcel, and pack the unit shockproof.