Airbag control unit with part number 89170-02W20

What does the airbag control unit 89170-02W20 do?

The airbag control unit 89170-02W20 is the central control unit of the restraint system (SRS) for Toyota. It monitors the crash sensors, decides in an impact on airbags and seatbelt pretensioners, and reports faults.

The evaluation takes place within milliseconds. In the background the unit continuously checks the connected components, so that it works reliably in an emergency.

After an accident it writes crash data to its memory and locks itself.

Why does the control unit 89170-02W20 fail?

The most common reason for the 89170-02W20 failing is stored crash data from an earlier accident, even if no airbag has deployed. Added to this are aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

A normal diagnostic tool cannot remove the crash data, so a reset does not help. The other causes can act together: electronic components age, solder joints can go cold, and moisture affects plugs.

Voltage spikes, for example from a weak battery or from a jump start, additionally load the circuit and can trigger faults.

How can you tell that the 89170-02W20 is defective?

You can recognise a defective 89170-02W20 by the airbag warning light in the instrument cluster, which lights up constantly or intermittently. Further signs include a fault message, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

The warning light is the direct signal that the restraint system has detected a fault, and it deserves attention. It indicates the defect even when the vehicle otherwise drives normally.

As long as the fault persists, airbags and seatbelt pretensioners may not deploy in an emergency. Prompt checking of the system is therefore advisable.

Which vehicles is the 89170-02W20 fitted in?

The control unit 89170-02W20 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

This assignment is shown in the following overview:

• Toyota Corolla E210 (2018-2022)
• Toyota Corolla E210 Facelift (from 2022)

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

For the same vehicles, we also repair control units with the part numbers 89170-02N50, 89170-02T10, 89170-02W80, 89170-0F150.

How does the repair of the 89170-02W20 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit before you create a repair order online and send the unit in well packed. Airbag24 then checks it, and this work usually takes 3–4 working days.

The sequence is to be observed for safety reasons. At Airbag24 the unit is examined on the test bench, defective components are repaired or replaced, the crash data is erased and the unit is completed with a function test.

Afterwards your own unit comes back to you. The 3–4 working days relate only to checking, repairing and testing at Airbag24. 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 89170-02W20 get to Airbag24?

You send the control unit 89170-02W20 either as a parcel or book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

Put the printed repair order into the parcel and pack the unit shockproof.