Airbag control unit with part number 89170-0R370

What does the airbag control unit 89170-0R370 do?

The airbag control unit 89170-0R370 controls the restraint system (SRS) in vehicles from Toyota. It processes the readings from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within milliseconds in a crash.

During normal driving the unit checks continuously whether all connected components are working. If it finds a fault, it stores it and shows it via the airbag warning light.

After an accident the control unit stores crash data and remains locked. The lock ends only once the unit has been repaired.

Why does the control unit 89170-0R370 fail?

The most common cause is crash data that remains in the memory after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase this data. In addition, ageing components, cold solder joints, moisture and corrosion on plugs, and voltage spikes from the vehicle electrical system can cause the failure.

Crash data can be overlooked precisely because the vehicle drives flawlessly after the incident. Only when the memory is read out does it become apparent that an entry remains which a standard tool does not remove.

A weak battery or a jump-start can cause voltage in the vehicle electrical system to fluctuate so strongly that the electronics are damaged. This is also among the causes considered during the check.

How can you tell that the 89170-0R370 is defective?

The airbag warning light in the instrument cluster stays on permanently or flickers, a fault message appears on the display, the diagnostic tool receives no connection to the control unit, and the fault memory cannot be cleared. In that case the airbags and seatbelt pretensioners may not be triggered in an emergency.

The airbag warning light reports every fault in the system, which makes it the first sign to watch for. A defect therefore does not remain hidden, but is immediately visible.

If the connection to the diagnostic tool fails, this also points to a problem in the control unit or its wiring. In this case, have an inspection carried out promptly.

Which vehicles is the 89170-0R370 fitted in?

Which equipment a vehicle has determines the installation, even within a model series. The 89170-0R370 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

These vehicles are recorded for this part number in our inventory:

• Toyota RAV4 XA50 (from 2018)

Before you send the unit in, compare the part number on the label with this page. That confirms that it is the correct control unit. Whether it is actually defective, or whether a plug or a cable is the cause, is shown only by the fault memory read out beforehand.

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 89170-0R370 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next create a repair order online and send the unit in well packed. Testing, repair and checking at Airbag24 usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and deletes the stored crash data. A function test follows, before your own unit is returned to you.

Keep to the order of removal, as it serves safety. The airbag components are not de-energised for as long as the battery is connected.

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 89170-0R370 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, the return shipment is made by UPS.

Put the printed repair order into the parcel, and pack the unit shock-proof.