Airbag control unit with part number 89170-0E450

What does the airbag control unit 89170-0E450 do?

The airbag control unit 89170-0E450 controls the restraint system (SRS) in Toyota. It evaluates the crash sensors, determines within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered, and monitors the entire system. Faults appear via the airbag warning light.

During normal driving the unit works unnoticed. It checks the power supply and connections continuously; faults it detects are stored in the fault memory, which a workshop can read out later.

After an accident it secures crash data and locks itself.

Why does the control unit 89170-0E450 fail?

On the 89170-0E450, stored crash data from an accident most often cause the failure, even if no airbag fired; standard diagnostic tools do not remove them. Other causes include aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes.

An accident without an airbag deployment is enough for crash data to be stored. Triggering is therefore not the criterion.

The remaining causes develop over time: electronics age, connectors can become damp or corroded, and voltage spikes occur, for example, with a weak battery or when a jump start is connected.

How can you tell that the 89170-0E450 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the 89170-0E450 is defective. In addition, the instrument cluster displays a fault message, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. In this state, airbags and seatbelt pretensioners may fail to deploy in an emergency.

This warning light points directly to a fault in the restraint system. Therefore have the vehicle checked promptly.

Which vehicles is the 89170-0E450 fitted in?

The control unit 89170-0E450 is fitted in these vehicles: Toyota Highlander XU70 (from 2019). You can tell whether your model is among them from the vehicle registration document.

The vehicles at a glance:

• Toyota Highlander XU70 (from 2019)

Compare the number on the label of the removed unit with this page; that only confirms the right unit. Have the fault memory read out beforehand, because this result shows whether the control unit itself is the cause or whether connectors and cables are affected.

For the same vehicles, we also repair control units with the part numbers 89170-0E690.

How does the repair of the 89170-0E450 work?

First have the fault memory of the 89170-0E450 read out, then disconnect the battery and only then remove the control unit. Then create a repair order online, enclose the log and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, replaces defective components, erases stored crash data and then carries out a functional test. Afterwards your own unit is sent back to you.

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 89170-0E450 get to Airbag24?

You send the control unit 89170-0E450 as a parcel, or book a UPS collection for an extra charge. After the repair, UPS brings the unit from Airbag24 back to you.

The printed repair order goes into the parcel, and the unit is packed shockproof.