Airbag control unit with part number 89170-0C690

What does the airbag control unit 89170-0C690 do?

The central control unit of the restraint system (SRS) in Toyota is the airbag control unit 89170-0C690. It processes the signals from the crash sensors, determines in an accident within milliseconds the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

It reports faults via the airbag warning light in the instrument cluster. In this way a malfunction cannot go unnoticed.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-0C690 fail?

The most common cause is crash data from an accident, even if no airbag was triggered; a standard diagnostic tool does not remove it. Other causes include ageing components, cold solder joints, moisture and corrosion, and voltage spikes.

The crash data is stored inside the control unit itself, so you cannot see it from outside. Further causes at a glance:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 89170-0C690 is defective?

A defect shows up as the airbag warning light in the instrument cluster, as a fault message in the instrument cluster, as no connection to the diagnostic tool and as a fault memory that cannot be cleared.

• Airbag warning light stays on continuously or intermittently
• Fault message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be cleared

The warning light shows the fault but not its cause. A plug or a cable can produce the same signs as the control unit.

In an emergency, airbags and seatbelt pretensioners may fail to deploy if the restraint system is faulty. Therefore have the system checked promptly.

Which vehicles is the 89170-0C690 fitted in?

The control unit 89170-0C690 is fitted in the following vehicles: Toyota Tundra K40 (from 2021); Toyota Sequoia K30 (from 2022). This selection offers guidance, but it does not replace a check of the unit.

The list below shows the vehicles for which this part number is on record.

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

Compare the part number on the label of the removed unit with this page. This establishes that it is the right unit. Also have the fault memory read out beforehand, because only the log shows whether the control unit 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 89170-0C690 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery and remove the control unit afterwards. Send the well-packed unit with an online repair order. At Airbag24 you can expect a processing time of 3–4 working days as a rule.

Airbag24 examines the unit on the test bench. Defective components are replaced, crash data deleted and a function test carried out before your own unit is returned.

The sequence of steps serves safety and is therefore without exception.

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 89170-0C690 get to Airbag24?

The unit reaches Airbag24 by parcel, or you book a UPS collection for an extra charge. The return of the unit after the repair also goes by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof so it survives transport well.