Airbag control unit with part number 89170-42230

What does the airbag control unit 89170-42230 do?

The airbag control unit 89170-42230 is the control centre of the restraint system (SRS) in Toyota. It evaluates the crash sensors, determines in a crash which airbags and seatbelt pretensioners are triggered, and checks the system continuously. After an accident it stores crash data and locks itself.

If it detects a fault, the airbag warning light in the instrument cluster comes on. For every driver in daily life, this indicator is the direct way to notice a fault.

Triggering takes place within milliseconds, which is why reliable electronics are indispensable.

Why does the control unit 89170-42230 fail?

Crash data from an accident is the most common cause, even when no airbag has been triggered, and a standard diagnostic tool does not remove it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, such as from a weak battery or jump-starting.

Crash data remains stored in the unit after an incident. This is also true when the airbags have not been triggered, and it has a direct effect on the diagnosis.

The other causes develop rather slowly: components age, solder joints become brittle, moisture attacks contacts. Voltage spikes in the vehicle electrical system are an additional factor.

How can you tell that the 89170-42230 is defective?

Typical signs of a defect in the 89170-42230 are an airbag warning light that stays on permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool with no connection to the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

• Airbag warning light in the instrument cluster, permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool with no connection to the control unit
• Fault memory cannot be cleared

Any one of these signs justifies a check.

Which cause lies behind it only becomes clear when the fault memory is read out.

Which vehicles is the 89170-42230 fitted in?

The control unit 89170-42230 is fitted in these vehicles: Toyota RAV4 XA30 (2006-2009) and XA30 Facelift (2009-2013). If you want to place your vehicle, you will find the matching comparison here.

The matching vehicles in the list:

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

Matching the part number with the label on the removed unit confirms that the unit is the right one, and nothing more. Only the log of the fault memory read out beforehand 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 150300-8850, 89170-0R022, 89170-0R140, 89170-42201, 89170-42210, 89170-42420.

How does the repair of the 89170-42230 work?

Start by having the fault memory read out and attach the log. Disconnect the battery, then remove the unit: in exactly this order. Create the repair order online, then pack the unit and send it off. Airbag24 usually needs 3–4 working days to process it.

Disconnecting the battery before removal serves safety in all work on the restraint system.

At our end the unit is checked, defective components are replaced, the stored crash data is erased and a function test is carried out. After that you receive your own unit back.

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 89170-42230 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. Airbag24 takes care of the return of the unit after the repair by UPS.

The printed repair order belongs in the parcel, and the control unit must be packed shock-resistant.