Airbag control unit with part number 89170-0R191

What does the airbag control unit 89170-0R191 do?

The airbag control unit 89170-0R191 is the central control unit of the restraint system (SRS) in Toyota. It evaluates the signals from the crash sensors, determines within milliseconds in an impact whether the airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults appear on the airbag warning light.

During operation the system is checked continuously. The unit records deviations in the fault memory, which can be read out with a diagnostic tool.

After an accident, it stores crash data and then locks itself. It thereby also takes on the function of an accident data recorder.

Why does the control unit 89170-0R191 fail?

The most common cause is crash data stored after an accident, even without an airbag having been triggered. Ordinary diagnostic equipment cannot remove it. Other triggers are ageing of components, cold solder joints, moisture and corrosion, and voltage spikes.

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

Which of these causes applies is only shown by the examination in each individual case.

How can you tell that the 89170-0R191 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, making it the first indication. Furthermore, a fault message appears in the instrument cluster, the diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared. Then there is a possibility that airbags and seatbelt pretensioners may not trigger in a crash.

Anyone who keeps driving relies on restraint systems whose function is not assured. A prompt check creates clarity here.

Which vehicles is the 89170-0R191 fitted in?

The control unit 89170-0R191 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018). You can make the comparison with your own car using the part number and the vehicle registration document.

The models with this part number are listed here:

• Toyota RAV4 XA50 (from 2018)

On the one hand, compare the part number on the label of the removed unit with this page; on the other hand, have the fault memory read out beforehand. The label comparison only shows that it is the correct unit. Only the readout 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 89170-0R191 work?

First have the fault memory read out and attach the log; then disconnect the battery and only then remove the control unit 89170-0R191. Then create the repair order online and send in the well-packed unit. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

The sequence is prescribed for safety reasons and should be followed exactly.

Airbag24 examines the unit on the test bench, repairs defective components, deletes the stored crash data and carries out a functional 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 89170-0R191 get to Airbag24?

You send in the unit as a parcel or book a UPS collection for an extra charge. Once the repair is finished, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel and pack the control unit 89170-0R191 shockproof.