Airbag control unit with part number 89170-0E500

What does the airbag control unit 89170-0E500 do?

The airbag control unit 89170-0E500 is the control unit of the restraint system (SRS) of Toyota. It processes the signals from the crash sensors and decides in an accident, in milliseconds, which airbags and seatbelt pretensioners are triggered.

In addition it monitors the system continuously and displays faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. The lock remains in place until the unit has been repaired.

Why does the control unit 89170-0E500 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed, and a normal diagnostic tool cannot remove it. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes, for example from a weak battery or a jump start.

The unit records crash data as soon as a registered impact occurs. No airbag has to have fired for this, which may only be visible during diagnosis.

The other causes tend to develop more slowly, for example when moisture attacks the contacts or solder joints give way.

How can you tell that the 89170-0E500 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and a fault message appears in the instrument cluster. Likewise, a defect is indicated if the diagnostic tool cannot establish a connection to the control unit, or if the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not trigger. The light shows the defect, so you should follow it up promptly.

When you start the engine, watch whether the light goes out after a short time. If it stays on, a diagnosis makes sense.

Which vehicles is the 89170-0E500 fitted in?

According to our current data, this assignment applies to Toyota. The control unit 89170-0E500 is fitted in these vehicles: Toyota Highlander XU70 (from 2019).

Below is the list of vehicles that our data links to this part number.

• Toyota Highlander XU70 (from 2019)

Compare the part number on the label of the removed unit with this page. This only establishes that it is the right unit. Have the fault memory read out beforehand, because only that shows whether the control unit itself 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 89170-0E690.

How does the repair of the 89170-0E500 work?

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

Airbag24 inspects the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes 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 89170-0E500 get to Airbag24?

The unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 handles the return shipment by UPS after the repair.

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