Airbag control unit with part number 89170-0C592

What does the airbag control unit 89170-0C592 do?

The airbag control unit 89170-0C592 is the central control of the restraint system (SRS) for Toyota. It evaluates the crash sensors and decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered. Faults in the system are shown via the airbag warning light.

The unit monitors the restraint system during operation.

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

Why does the control unit 89170-0C592 fail?

Stored crash data is the most common cause, even if no airbag was triggered in an accident. A normal diagnostic tool cannot erase this data. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes, can also play a role.

Crash data is most frequent because it remains in the memory of the unit. The other causes come from the electronics and their surroundings.

Components age over time, and moisture can attack contacts. Voltage spikes occur, for example, with a weak battery or when jump-starting.

How can you tell that the 89170-0C592 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, a fault message appears in the instrument cluster. The diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared.

These findings mean that airbags and seatbelt pretensioners may not trigger in an emergency. A permanent warning light is therefore a reason not to wait any longer.

A missing connection to the diagnostic tool does not necessarily mean damage to the control unit. Cables may also be affected.

Which vehicles is the 89170-0C592 fitted in?

The control unit 89170-0C592 is fitted in these vehicles: Toyota Sequoia K20 (2008-2022).

Here follows the list of vehicles recorded for this part number.

• Toyota Sequoia K20 (2008-2022)

Compare the part number on the label of the removed unit with this page to confirm that it is the right unit. Also have the fault memory read beforehand. Only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-0C410, 891700C500.

How does the repair of the 89170-0C592 work?

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

Airbag24 checks the unit, replaces defective components, erases stored crash data and carries out a function test. The unit then goes 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 89170-0C592 get to Airbag24?

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

Put the printed repair order in the parcel and pack the control unit shockproof.