Airbag control unit with part number 89170-42331

What does the airbag control unit 89170-42331 do?

The airbag control unit 89170-42331 is the control unit of the restraint system (SRS) on Toyota. It checks the signals from the crash sensors, selects in a crash within milliseconds the airbags and seatbelt pretensioners that are to deploy, and monitors the system continuously. After an accident it stores crash data and locks itself.

If it detects a fault, it reports this via the airbag warning light in the instrument cluster. Stored crash data remain in the control unit until they are deleted.

Why does the control unit 89170-42331 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot delete them. Further causes are ageing of components, cold solder joints, moisture, corrosion and voltage spikes.

In detail, the following points come into consideration:

• Crash data from an accident without an airbag deploying
• Ageing of electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery

How can you tell that the 89170-42331 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. The diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may therefore fail to deploy in a crash.

If the warning light comes on, have the system checked promptly. An error message is a clear sign that the system needs attention and should not be ignored.

Which vehicles is the 89170-42331 fitted in?

The airbag control unit 89170-42331 is fitted in these vehicles: Toyota RAV4 XA30 (2006-2009) and XA30 Facelift (2009-2013).

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

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

Compare the number on the label of the removed unit with this page. This only confirms that it is the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 150300-8850, 89170-0P010, 89170-0P020, 89170-0P030, 89170-0P040, 89170-0P050.

How does the repair of the 89170-42331 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit; online you create the repair order. Processing at Airbag24 takes 3–4 working days.

At the test bench Airbag24 examines the unit and repairs or replaces defective components. Airbag24 also deletes stored crash data, followed by a function test, before your own unit is returned.

The order of steps is specified for safety reasons and should be followed.

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 89170-42331 get to Airbag24?

You can send the unit in as a parcel or book a UPS collection for an extra charge. After the repair UPS brings your own unit back to you.

Put the printed repair order in the parcel. Pack the unit so that it is shock-resistant.