Airbag control unit with part number 89170-0E220

What does the airbag control unit 89170-0E220 do?

The airbag control unit 89170-0E220 is the central control unit of the restraint system (SRS) for Toyota. In an accident, it evaluates the signals from the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

At the same time it monitors the system without interruption and indicates faults via the airbag warning light in the instrument cluster. This message is the signal to have the system checked.

After an accident, the control unit stores crash data and locks itself. The next section explains what may lie behind this.

Why does the control unit 89170-0E220 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Stored crash data is therefore the first point that a check should clarify. Have the fault memory read out beforehand so that the cause becomes visible.

Aged electronic components and cold solder joints can impair function. Moisture and corrosion attack plug connections, and voltage spikes, for example from a weak battery or a jump start, put a strain on the electronics.

How can you tell that the 89170-0E220 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. Furthermore, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared.

The warning light is the first sign you should watch for as soon as it comes on. It indicates the fault and is therefore to be taken seriously.

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. Therefore have the system checked promptly.

Which vehicles is the 89170-0E220 fitted in?

The control unit 89170-0E220 is fitted in these vehicles: Toyota Highlander XU70 (from 2019).

The list below names the vehicles that are stored for this control unit. Compare them with your own vehicle.

• Toyota Highlander XU70 (from 2019)

Compare the part number on the label of the removed unit with this page; then you know it is the right unit. Have the fault memory read out before removal, because only this result shows whether the control unit or a connector or 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 89170-0E220 work?

First, have the fault memory read out and attach the log, then disconnect the battery. Afterwards, remove the control unit and create a repair order online, which you send in with the unit. Testing, repairing and checking at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. After that, the unit is returned 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 89170-0E220 get to Airbag24?

You send the control unit 89170-0E220 to us as a parcel or 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 shock-proof.