Airbag control unit with part number 89170-0C422

What does the airbag control unit 89170-0C422 do?

The airbag control unit 89170-0C422 forms the central switching point of the SRS restraint system in Toyota vehicles. It continuously checks the crash sensors, calculates within milliseconds when airbags and seatbelt pretensioners are to be triggered in a crash, and indicates faults via the airbag warning light.

The crash sensors supply the measured values that the unit evaluates. The control unit works without any action on your part.

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

Why does the control unit 89170-0C422 fail?

Stored crash data is the most common cause of a failure, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The crash data remains stored in the unit after an accident. At Airbag24 it is erased as part of the repair.

Aged components, cold solder joints and corrosion on connectors cannot be clearly identified from the outside.

How can you tell that the 89170-0C422 is defective?

The airbag warning light in the instrument cluster lights up constantly or only intermittently. In addition, a fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the control unit. The fault memory also cannot be cleared.

If you notice any of these signs, airbags and seatbelt pretensioners may not deploy in an emergency. Please have the system checked promptly.

Which vehicles is the 89170-0C422 fitted in?

The control unit 89170-0C422 is fitted in these vehicles: Toyota Tundra K30 (2007-2021).

The list below shows the assignment as it is recorded for this part number.

• Toyota Tundra K30 (2007-2021)

First check whether the part number on the label of your removed unit matches this page. This only confirms that you have the right unit, not the cause. Have the fault memory read out beforehand, because only that log shows whether the control unit itself is defective or a connector or cable is the cause.

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 89170-0C422 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit 89170-0C422. Then create the repair order online and send the unit off well packed.

At Airbag24, the team checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days.

You then receive your own unit back. 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 89170-0C422 get to Airbag24?

You send the unit as a parcel or, for an extra charge, book a UPS collection. After the repair Airbag24 returns your own unit by UPS.

The printed repair order goes in the parcel, and the unit must be packed shockproof.