Airbag control unit with part number 89170-02N00

What does the airbag control unit 89170-02N00 do?

The airbag control unit 89170-02N00 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the crash sensors, decides in an accident within milliseconds whether the airbags and seatbelt pretensioners are triggered, and monitors the entire system.

The unit checks the system continuously for faults and stores them in the fault memory. The airbag warning light makes them visible in the instrument cluster.

After an accident it stores crash data and locks itself. Only a repair lifts the lock again.

Why does the control unit 89170-02N00 fail?

The most common cause is crash data stored after an accident, even without triggered airbags; a normal diagnostic tool cannot remove it. Further causes are:

• aged electronic components
• cold solder joints
• moisture and corrosion at the plug connections
• voltage spikes in the vehicle electrical system

The crash data remains in the unit after an accident. The fact that the vehicle then runs normally does not change this.

Which cause applies in the individual case can only be determined by the check.

How can you tell that the 89170-02N00 is defective?

A defect shows itself through this airbag warning light, through fault messages in the instrument cluster, through a missing connection to the diagnostic tool, and through a fault memory that cannot be cleared.

• Airbag warning light lights up permanently or intermittently
• Fault message appears in the instrument cluster
• Diagnostic tool does not get a connection to the control unit
• Fault memory cannot be cleared

In that case, airbags and seatbelt pretensioners may not trigger in an emergency.

Follow up on the warning and have the fault clarified.

Which vehicles is the 89170-02N00 fitted in?

The 89170-02N00 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

These vehicles are on record:

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

Compare the part number on the label of the removed unit with this page. This way you make sure that it is the correct unit. Additionally have the fault memory read out beforehand, because only this result shows whether the control unit 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 89170-02N00 work?

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

The order of steps protects you, so keep to it. The control unit may only be removed after the battery has been disconnected, and the log goes into the parcel.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and runs a function test.

Your own control 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 89170-02N00 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

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