Airbag control unit with part number 89170-0C662

What does the airbag control unit 89170-0C662 do?

The airbag control unit 89170-0C662 controls the restraint system for Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows faults via the airbag warning light.

The system works in the background throughout the entire journey. After an accident, the unit stores crash data and locks itself.

For the evaluation it needs a stable supply from the vehicle electrical system and undamaged connections to the sensors and triggers.

Why does the control unit 89170-0C662 fail?

Stored crash data is the most common cause when the 89170-0C662 fails, even if no airbag has deployed. Other causes are aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data after an accident cannot be erased with a normal diagnostic tool, so the finding remains with simple erase attempts.

The other causes relate to the electronics and their surroundings. Electronic components can age, solder joints can be cold, and moisture or corrosion attack plug connections. Voltage spikes, for example with a weak battery or during a jump start, put additional strain on the circuit.

How can you tell that the 89170-0C662 is defective?

A defect in the 89170-0C662 shows itself mainly through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Also present are an error message in the instrument cluster, no connection for the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

Typical signs at a glance:

• airbag warning light lights up permanently or intermittently
• error message in the instrument cluster
• diagnostic tool cannot establish a connection to the control unit
• fault memory cannot be cleared

The warning light is the clearest sign; check the messages in the instrument cluster as well.

Which vehicles is the 89170-0C662 fitted in?

This control unit belongs to Toyota. The 89170-0C662 is fitted in these vehicles: Toyota Tundra K40 (from 2021); Toyota Sequoia K30 (from 2022).

We have the following vehicles on record for this part number:

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

You make the label comparison on the removed unit: check the part number on the label against this page. This only confirms that it is the right unit. Have the fault memory read out first, because only this result shows whether the control unit is defective or whether a plug or a 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 89170-0C662 work?

First have the fault memory read out and enclose the log; then disconnect the battery, remove the control unit 89170-0C662, create a repair order online and send the unit in, well packed. Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test, after which your unit is returned. Processing at Airbag24 usually takes 3–4 working days.

The order protects you when working on the airbag system and is therefore binding.

Airbag24 carries out the check on the test bench. Repair and function test follow before the 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 89170-0C662 get to Airbag24?

Either you hand in the control unit 89170-0C662 as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

Put the printed repair order into the parcel and pack the unit shockproof.