Airbag control unit with part number 89170-0C400

What does the airbag control unit 89170-0C400 do?

The airbag control unit 89170-0C400 coordinates the restraint system (SRS) for Toyota. It evaluates the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and checks the system continuously. After an accident it stores crash data and locks itself.

The checking happens in the background while the vehicle is driving. If the unit detects a fault, it indicates this via the airbag warning light in the instrument cluster.

How reliably the system works in an emergency depends largely on this one control unit.

Why does the control unit 89170-0C400 fail?

Crash data that stays stored after an accident is the most common cause with the 89170-0C400: it sits in the unit even when no airbag was triggered, and a normal diagnostic tool cannot erase it. Added to this are aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes.

Airbag24 erases the crash data during the repair. The other causes can only be narrowed down on the unit itself.

Voltage spikes arise, for example, from a weak battery or after a jump start and can stress the electronics.

How can you tell that the 89170-0C400 is defective?

An airbag warning light in the instrument cluster that stays on permanently or intermittently is the most important sign of a defect on the 89170-0C400. An error message may also appear, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared.

The light is the visible sign that the system has registered a fault. A diagnostic tool that cannot establish a connection additionally confirms this suspicion.

As long as this is the case, the airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the 89170-0C400 fitted in?

The 89170-0C400 unit is fitted in these vehicles: Toyota Sequoia K10 (2000-2004) and K10 Facelift (2005-2007); Toyota Tundra K20 (2000-2006).

Here are the vehicles assigned to this number:

• Toyota Sequoia K10 (2000-2004)
• Toyota Sequoia K10 Facelift (2005-2007)
• Toyota Tundra K20 (2000-2006)

Check the part number on the label of the removed unit against this page; then the right unit is identified. Whether the control unit is defective or whether a connector or cable is the cause is only shown by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-0C030, 89170-0C040, 89170-0C050, 89170-0C060, 89170-0C142, 891700C140.

How does the repair of the 89170-0C400 work?

First, have the fault memory read out and enclose the log. Then disconnect the battery, only afterwards remove the control unit 89170-0C400 and create a repair order online. Send in the packed unit.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days.

Afterwards you get your own unit back.

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 89170-0C400 get to Airbag24?

You can send in the control unit 89170-0C400 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Put the printed repair order into the parcel; pack the unit shock-resistant.