Airbag control unit with part number 89170-0C442

What does the airbag control unit 89170-0C442 do?

The airbag control unit 89170-0C442 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults it finds are shown via the airbag warning light.

The crash sensors constantly supply measured values to the control unit. In addition, the unit checks the lines to the airbags and seatbelt pretensioners, so that every component can perform its task in an emergency.

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

Why does the control unit 89170-0C442 fail?

Stored crash data are the most common cause, even if no airbag was triggered in the accident. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or after a jump start.

The crash data remain in the memory, and a normal diagnostic tool cannot erase them. That is why the fault persists even when the vehicle drives perfectly again after the accident. Airbag24 erases the crash data during the repair.

The other causes lie in the unit itself or in its environment in the vehicle. Aged components lose reliability over time, moisture and corrosion attack the contacts, and voltage spikes from the on-board electrics can damage circuits.

How can you tell that the 89170-0C442 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In this case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most important hint the vehicle gives you. If it lights up, have the system checked promptly rather than ignoring it.

Only the evaluation of the fault memory shows whether the control unit itself is affected or only a line.

Which vehicles is the 89170-0C442 fitted in?

The airbag control unit 89170-0C442 is fitted in these vehicles: Toyota Tundra K30 (2007-2021). Comparing the part number shows whether you have the correct unit in front of you.

The following list shows the vehicles recorded in the assignment for this part number.

• Toyota Tundra K30 (2007-2021)

First compare the part number on the label of the removed unit with this page. In addition, have the fault memory read out before removal, because only this result shows whether the control unit is defective or a plug 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 89170-0C442 work?

For the repair of the 89170-0C442, first have the fault memory read out and attach the log; then disconnect the battery and remove the control unit. Next, create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

The sequence is fixed for safety reasons. The battery is disconnected only once the log is available, and the control unit may be removed only after that.

Airbag24 then checks the unit on the test bench, repairs defective components and erases the stored crash data. After that a function test follows before your own unit is sent 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 89170-0C442 get to Airbag24?

You send the control unit 89170-0C442 as a parcel or book UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof. This way your control unit reaches Airbag24 safely.