Airbag control unit with part number 89170-0C261

What does the airbag control unit 89170-0C261 do?

The airbag control unit 89170-0C261 forms the central control unit of the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors and, in an accident, decides which airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

While driving, the unit monitors the restraint system continuously. If it detects a fault, it shows this via the airbag warning light.

Why does the control unit 89170-0C261 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Stored crash data cannot be removed with a normal diagnostic tool, so the fault remains stored in the control unit.

The other causes lie in the electronics and at the plug connections. Moisture and corrosion attack the contacts, and voltage spikes place additional strain on the components.

How can you tell that the 89170-0C261 is defective?

A defect in the 89170-0C261 shows itself mainly through the airbag warning light, which lights up permanently or intermittently in the instrument cluster. In addition, there are error messages and problems when reading out the fault memory.

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. The warning light indicates the defect. Please have the system checked promptly.

Which vehicles is the 89170-0C261 fitted in?

The control unit 89170-0C261 is fitted in these vehicles: Toyota Tundra K20 (2000-2006).

The models to which this part number is assigned are listed here at a glance:

• Toyota Tundra K20 (2000-2006)

Matching the label number with this page only clarifies whether the right unit has been removed. Whether the control unit is defective or a plug or cable is the cause only becomes clear from the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-0C050, 89170-0C060.

How does the repair of the 89170-0C261 work?

First comes reading out the fault memory; the log goes into the parcel. Only then disconnect the battery and remove control unit 89170-0C261. Afterwards create the repair order online and send the well-packed unit.

At Airbag24 the unit is checked first, then defective components are replaced, stored crash data is erased, and a function test concludes the process. Your own unit goes back to you afterwards. The checking, repairing and testing at Airbag24 usually take 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 89170-0C261 get to Airbag24?

Control unit 89170-0C261 reaches Airbag24 either as a parcel or is collected by UPS for an extra charge. The return journey after the repair is again handled by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shockproof.