Airbag control unit with part number 89170-0C432

What does the airbag control unit 89170-0C432 do?

The airbag control unit 89170-0C432 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals of the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. It also monitors the system continuously.

If the unit detects a fault, it shows this via the airbag warning light in the instrument cluster. The control works in the background, without you having to operate anything, and its sole purpose is to keep the restraint systems functional in an emergency.

After an accident the control unit stores crash data and then locks itself. For this reason, do not cover up a fault in the system by resetting it, but have it checked by a specialist. The unit is designed to protect itself in an incident, and this protection is part of its function.

Why does the control unit 89170-0C432 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered, and these cannot be removed with a normal diagnostic tool. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, or voltage spikes, for example from a weak battery or a jump start, can also cause the failure.

Crash data remains stored in the unit until it is removed properly. If you only read out the fault memory while searching for the fault, you see the entry but get no further, as long as the data remains in the control unit.

The other causes are of a more general nature. Electronics age over time, solder joints can be cold, and moisture or corrosion attack the contacts. Voltage spikes arise, for example, when the battery is weakening or when a jump start is used.

How can you tell that the 89170-0C432 is defective?

A defect can show up as the airbag warning light in the instrument cluster staying on permanently or intermittently, and as a fault message in the display. If the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared, this is also a sign of a defect.

The airbag warning light is the most important warning sign, and you should not ignore it. If it stays on permanently, there is a fault in the restraint system that should be clarified promptly.

In an emergency, airbags and seatbelt pretensioners may then not trigger. That is why a lit warning light does not belong in a waiting queue, but calls for an immediate check.

Which vehicles is the 89170-0C432 fitted in?

Which vehicles are affected depends on the vehicle itself. The airbag control unit 89170-0C432 is fitted in these vehicles: Toyota Tundra K30 (2007-2021).

The following list shows the vehicles that we have on record for this part number.

• Toyota Tundra K30 (2007-2021)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the right unit in front of you. Also have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether 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 89170-0C432 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit.

At Airbag24 the team checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a functional test. Afterwards your unit goes back to you.

Airbag24 normally schedules 3–4 working days for checking, repairing and testing. 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 89170-0C432 get to Airbag24?

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

Put the printed repair order in the parcel and pack the control unit shock-proof. A unit that is loosely placed in the box can be damaged in transit.