Airbag control unit with part number 89170-0C540

What does the airbag control unit 89170-0C540 do?

The airbag control unit 89170-0C540 controls the SRS restraint system for Toyota. It checks the signals from the crash sensors, decides in an impact whether airbags and seatbelt pretensioners fire, and displays faults via the airbag warning light.

The control unit works constantly in the background, monitoring sensors, wiring and actuators. If it detects a deviation, it creates an entry in the fault memory.

In an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-0C540 fail?

The most common cause on the 89170-0C540 is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it, and Airbag24 erases it during the repair. Other causes are ageing, moisture and voltage spikes.

Aged components, cold solder joints and corrosion at plug connectors also count among the possible causes.

Moisture affects the contacts, and voltage spikes, for example from a weak battery or a jump start, can stress the electronics. Which cause applies in an individual case is clarified by the examination on the test bench.

How can you tell that the 89170-0C540 is defective?

On the 89170-0C540, the airbag warning light in the instrument cluster indicates a fault as soon as it lights up permanently or intermittently. Added to this are a fault message in the instrument cluster, a diagnostic tool without connection, and a fault memory that cannot be cleared.

The warning light shows the fault as soon as the control unit detects it, and reading out the fault memory provides details.

If the light is on, airbags and seatbelt pretensioners may not deploy in an emergency. So take this seriously and act promptly.

Which vehicles is the 89170-0C540 fitted in?

The 89170-0C540 is fitted in these vehicles: Toyota Tundra K30 (2007-2021); Toyota Sequoia K20 (2008-2022). Whether it suits your car is shown by comparing the part number on the unit.

The suitable vehicles for this number are compiled here.

• Toyota Tundra K30 (2007-2021)
• Toyota Sequoia K20 (2008-2022)

Compare the part number on the label with this page, and then you know it is the correct unit. Only a read-out fault memory reveals whether the electronics in the unit are affected or whether only a cable or plug is causing the problem.

For the same vehicles, we also repair control units with the part numbers 89170-0C410, 89170-0C440, 89170-0C450, 89170-0C451, 89170-0C452, 89170-0C490.

How does the repair of the 89170-0C540 work?

At the start, the fault memory of the 89170-0C540 is read out, and you enclose the log. Then disconnect the battery and remove the control unit. Next, create the repair order online and pack the unit carefully.

At Airbag24, the unit is first examined on the test bench. Then the damaged points are repaired, the crash data is erased and the unit undergoes a function test. Processing at Airbag24 usually takes 3–4 working days.

Your own, repaired unit is returned to you afterwards.

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 89170-0C540 get to Airbag24?

You can send the control unit 89170-0C540 in as a parcel or have it collected by UPS for an extra charge. The return after the repair is likewise by UPS. Enclose the printed repair order and pack the unit shock-proof.

The carton should be chosen so that the unit does not slide back and forth inside it.