Airbag control unit with part number 89170-08290

What does the airbag control unit 89170-08290 do?

The airbag control unit 89170-08290 coordinates the restraint system (SRS) in Toyota. It processes the measured values from the crash sensors, decides in an accident, within milliseconds, whether airbags and seatbelt pretensioners are triggered, and checks the entire system continuously.

Faults are displayed via the airbag warning light. After an accident, the unit stores crash data and locks itself, and this lock only ends with the repair.

As long as everything is in order, the control unit remains unobtrusive in the background. Only a warning makes its work visible, which is why a brief look at the warning light after starting is worthwhile.

Why does the control unit 89170-08290 fail?

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

Crash data remains in the unit even when the vehicle drives normally again afterwards. A commercially available diagnostic tool cannot remove it, so the system continues to report a fault. The erasure takes place at Airbag24 as part of the repair.

The other causes do not necessarily show up immediately. Ageing and moisture gradually weaken solder joints and contacts, whereas voltage spikes can cause a failure suddenly.

How can you tell that the 89170-08290 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently, through an error message in the instrument cluster, through the diagnostic tool having no connection to the control unit, and through a fault memory that cannot be cleared.

A permanently lit warning light is a clear sign of a fault in the restraint system. An intermittent light can also indicate a fault, even if it does not occur on every journey.

In an emergency, airbags and seatbelt pretensioners may fail to deploy. The warning light makes the defect visible, which is why it is important to follow up on the warning.

Which vehicles is the 89170-08290 fitted in?

The control unit 89170-08290 is fitted in these vehicles: Toyota Sienna XL30 (2010-2020).

The vehicles for which this part number is registered are listed here:

• Toyota Sienna XL30 (2010-2020)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the right unit in front of you. Have the fault memory read out beforehand, because only that 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 89170-08040, 89170-08130, 89170-08140, 89170-08170, 89170-08230.

How does the repair of the 89170-08290 work?

First, have the fault memory read out and attach the log. Then disconnect the battery, only then remove the control unit, create a repair order online and send the unit in well packed. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. The unit then goes back to you.

The stated time refers solely to checking, repairing and testing at Airbag24.

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 89170-08290 get to Airbag24?

You send the control unit 89170-08290 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Place the printed repair order in the parcel and pack the unit shockproof.