Airbag control unit with part number 89170-0C591

What does the airbag control unit 89170-0C591 do?

The airbag control unit 89170-0C591 runs the restraint system (SRS) in vehicles from Toyota. From the signals of the crash sensors it determines, in a crash, which airbags and seatbelt pretensioners should trigger; it has only milliseconds to do so. It monitors the system continuously and shows faults via the airbag warning light.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 89170-0C591 fail?

The most common cause is crash data stored in the unit after an accident, even if no airbag has deployed; an ordinary diagnostic tool cannot remove it. Ageing electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes, for example from a weak battery or jump-starting, are also possible causes.

Airbag24 clears this crash data during the repair. Which of the remaining causes applies can only be narrowed down by testing on the test bench.

How can you tell that the 89170-0C591 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently, through an error message in the instrument cluster, through the diagnostic tool having no contact with the control unit, or through a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

Such a warning should be taken seriously, because the warning light makes the fault visible.

Which vehicles is the 89170-0C591 fitted in?

The 89170-0C591 was fitted in the following vehicles: Toyota Sequoia K20 (2008-2022).

This list assigns the part number to the vehicles:

• Toyota Sequoia K20 (2008-2022)

Comparing the part number on the label of the removed unit with this page ensures that you have the correct unit. Having the fault memory read out beforehand, on the other hand, 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 89170-0C591 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, only then remove the control unit, and create a repair order online. Finally, pack the unit well and send it in.

Airbag24 tests the unit on the test bench, repairs defective components and clears stored crash data. A function test follows, after which your own unit is returned to you.

For checking, repairing and testing, Airbag24 typically allows 3–4 working days. 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 89170-0C591 get to Airbag24?

Either you send the unit to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

You place the printed repair order in the box and pack the unit so that it is shock-resistant.