Airbag control unit with part number 89170-02K90

What does the airbag control unit 89170-02K90 do?

The airbag control unit 89170-02K90 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It indicates faults via the airbag warning light; after an accident it stores crash data and locks itself.

Monitoring runs without pause in the background and checks the connected components.

Why does the control unit 89170-02K90 fail?

The most common cause at the control unit 89170-02K90 is stored crash data, even if no airbag has deployed; it cannot be erased with a standard diagnostic tool. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data stays in memory after an accident until it is deliberately erased.

Aged electronics, cold solder joints and corrosion develop over time. Moisture speeds up corrosion on plugs.

Voltage spikes act briefly but still strain the electronics, for example with a weak battery or a jump start.

How can you tell that the 89170-02K90 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit 89170-02K90, and the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may not deploy in an emergency.

The light indicates the fault. When it lights up, have the fault memory read out rather than just watching the display.

Which vehicles is the 89170-02K90 fitted in?

The airbag control unit 89170-02K90 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

This control unit is on record for the following vehicles:

• Toyota Corolla E170 (2013-2018)

Comparing the part number on the label of the removed unit with this page only ensures that you have the correct unit. The fault memory read out beforehand shows instead 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 89170-02C60, 89170-02C70, 89170-02C80, 89170-02C90, 89170-12280, 89170-12340.

How does the repair of the 89170-02K90 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only after that remove the control unit 89170-02K90. Finally, create a repair order online and send the unit in well packed.

The sequence is binding for your safety.

Airbag24 examines the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing takes 3–4 working days as a rule. The unit is then returned 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 89170-02K90 get to Airbag24?

You send the unit as a parcel or book UPS collection for an extra charge; after the repair Airbag24 sends it back by UPS. Put the printed repair order into the parcel and pack the control unit 89170-02K90 shock-proof.

Make sure the carton is securely closed.