Airbag control unit with part number 89170-0C691

What does the airbag control unit 89170-0C691 do?

In Toyota vehicles, the airbag control unit 89170-0C691 is the central SRS control unit. It receives the messages from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered.

It monitors the system continuously. If it detects a fault, it reports it to the airbag warning light in the instrument cluster.

If a crash is registered, the control unit stores crash data and then locks itself.

Why does the control unit 89170-0C691 fail?

The most common cause is crash data stored after an accident, even when no airbag was triggered. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example with a weak battery or jump-starting.

A normal diagnostic tool cannot erase the crash data. Erasing it is part of the repair at Airbag24.

Testing on the test bench shows which of these causes applies in each individual case.

How can you tell that the 89170-0C691 is defective?

A defect shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition there may be an error message in the instrument cluster, a diagnostic tool with no connection to the control unit, and a fault memory that cannot be cleared.

As long as these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency. The warning light therefore makes the defect visible from the outside.

Which vehicles is the 89170-0C691 fitted in?

The control unit 89170-0C691 is fitted in these vehicles: Toyota Tundra K40 (from 2021); Toyota Sequoia K30 (from 2022).

The vehicles as a list:

• Toyota Tundra K40 (from 2021)
• Toyota Sequoia K30 (from 2022)

You can use this page to compare the part number on the label; this only confirms that you have the right unit. Having the fault memory read out before you send it in shows the actual cause: the control unit itself, or a plug or cable.

For the same vehicles, we also repair control units with the part numbers 89170-34060.

How does the repair of the 89170-0C691 work?

Your first step is to have the fault memory read out; attach the log to the unit before you disconnect the battery and remove it. Online, you create the repair order and send the unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. The 3–4 working days cover only this work. Afterwards your own unit is returned.

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 89170-0C691 get to Airbag24?

Your unit reaches Airbag24 as a package, or you can book a UPS collection for an extra charge. The return shipment after the repair also goes by UPS.

The printed repair order goes into the package; pack the control unit so that it is shockproof.