Airbag control unit with part number 89170-0R220

What does the airbag control unit 89170-0R220 do?

The airbag control unit 89170-0R220 is the switching centre of the restraint system (SRS) for Toyota. In an emergency it evaluates the signals from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation it monitors all components and reports faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. The lock only ends with the repair.

Why does the control unit 89170-0R220 fail?

Stored crash data is the most common cause of a failure of the 89170-0R220, even if no airbag has deployed. Aged components, cold solder joints, moisture and voltage spikes are also possible causes.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion on plug connectors
• Voltage spikes, for example from a weak battery or jump-starting

Crash data cannot be cleared with a normal diagnostic tool. It therefore stays in the unit until the repair removes it.

The causes listed occur independently of one another and can also be present together.

How can you tell that the 89170-0R220 is defective?

A defect shows up as the airbag warning light in the instrument cluster lighting up permanently or intermittently, as an error message in the instrument cluster, or as a diagnostic tool that cannot establish a connection to the control unit. A fault memory that cannot be cleared is also a sign. In an emergency, airbags and seatbelt pretensioners may then not deploy.

The warning light is the clearest sign. Act on it rather than ignoring the display.

Even without a warning light, the connection to the diagnostic tool can fail. If in doubt, a look at the fault memory will provide clarity.

Which vehicles is the 89170-0R220 fitted in?

We have vehicles on record for this part number. The control unit 89170-0R220 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The assignment as it is on record with us can be seen in this list.

• Toyota RAV4 XA50 (from 2018)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only this 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 150800-4431, 152100-0262, 152100-4560, 89170-42400, 89170-42870, 89170-42A60.

How does the repair of the 89170-0R220 work?

First read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Next, send in the well-packed unit. Airbag24 checks it on the test bench, replaces defective components, deletes the crash data and carries out a function test; processing usually takes 3–4 working days.

This time applies solely to checking, repairing and testing at Airbag24, not to your steps or to shipping.

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 89170-0R220 get to Airbag24?

You can send the 89170-0R220 in as a parcel or have it collected by UPS for an extra charge. Airbag24 returns it by UPS after the repair.

The printed repair order belongs in the parcel. Make sure the unit is packed shockproof before you hand it over.