Airbag control unit with part number 89170-0C660

What does the airbag control unit 89170-0C660 do?

The control unit 89170-0C660 monitors the restraint system (SRS) of Toyota and decides in an accident which airbags and seatbelt pretensioners are triggered. The decision is made within milliseconds based on the crash sensors. A fault is shown by the airbag warning light, and after an accident the device stores crash data and locks itself.

The system consists of several components, whose interplay the control unit coordinates. It works continuously, that is, even when nothing is happening.

Why does the control unit 89170-0C660 fail?

With 89170-0C660, stored crash data after an accident is the most common cause, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other causes include ageing electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data is not a malfunction in the strict sense, but an entry in the memory. This entry remains, regardless of how the vehicle continues to run afterwards.

Electronics age, solder joints can become cold, and moisture attacks the contacts. Weak batteries or jump-starting create voltage spikes that can strain the circuit.

How can you tell that the 89170-0C660 is defective?

A defect in the 89170-0C660 can show itself through an airbag warning light that lights up permanently or intermittently, and through a fault message in the instrument cluster. A diagnostic tool without a connection to the control unit and a fault memory that cannot be erased are also conspicuous. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be erased

Even one of these signs justifies a check of the system.

Which vehicles is the 89170-0C660 fitted in?

The 89170-0C660 is fitted in these vehicles: Toyota Tundra K40 (from 2021); Toyota Sequoia K30 (from 2022). The part number is decisive, not the name of the vehicle.

The list of vehicles recorded for this part number follows here.

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

Compare the number on the label of the removed device with this page; this only ensures that it is the correct device. Also have the fault memory read out beforehand, because only that result shows whether the control unit itself is defective or whether a plug or cable is the cause.

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

How does the repair of the 89170-0C660 work?

You have the fault memory read out, and the log belongs in the parcel. Then disconnect the battery before the control unit 89170-0C660 is removed. Next, create a repair order online and send the device in well packed.

At Airbag24 the device is first examined on the test bench; afterwards defective components are repaired, stored crash data is erased and a function test is carried out. These steps usually take 3–4 working days.

The device is then returned 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 89170-0C660 get to Airbag24?

The 89170-0C660 goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the control unit so that it can be transported shock-proof.