Airbag control unit with part number 89170-42290

What does the airbag control unit 89170-42290 do?

The airbag control unit 89170-42290 is the control unit of the restraint system (SRS) of Toyota. It processes the sensor signals, decides in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults are shown via the airbag warning light.

During operation the control unit checks whether the power supply, the firing circuits and the plug connections are intact. Every deviation is recorded in the fault memory.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-42290 fail?

Most often, the cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes are ageing electronics, cold solder joints and moisture at the plug connectors.

Crash data cannot be removed with a standard tool. Airbag24 erases it during the repair.

Other causes include:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or after jump-starting

How can you tell that the 89170-42290 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, a fault message appears, the diagnostic tool finds no connection to the control unit, and the fault memory remains. The airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The warning light shows the defect as soon as the system detects it. It is therefore the first indication and not a detail to be ignored.

The fault message and the missing connection to the diagnostic tool also point to a check. Together they form a clear picture.

Which vehicles is the 89170-42290 fitted in?

The 89170-42290 is fitted in these vehicles: Toyota RAV4 XA30 (2006-2009) and XA30 Facelift (2009-2013).

The list shows the models for which this part number is intended.

• Toyota RAV4 XA30 (2006-2009)
• Toyota RAV4 XA30 Facelift (2009-2013)

Compare the part number on the label of the removed unit with this page to make sure it is the right unit. This says nothing yet about the cause. Have the fault memory read out beforehand, because only then does it show whether the control unit is defective or a plug or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 150300-8850, 89170-0R022, 89170-0R140, 89170-42201, 89170-42210, 89170-42420.

How does the repair of the 89170-42290 work?

Have the fault memory read out and enclose the printout, then disconnect the battery and afterwards remove the control unit 89170-42290. Then create a repair order online and send the unit in carefully packed.

The order is binding, because it serves safety. Without a disconnected battery, the control unit is not removed.

Airbag24 checks the unit on the test bench, renews defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. Your own unit then 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 89170-42290 get to Airbag24?

You send the control unit 89170-42290 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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