Airbag control unit with part number 89170-02U20

What does the airbag control unit 89170-02U20 do?

In Toyota vehicles the airbag control unit 89170-02U20 has the task of controlling the restraint system (SRS). It evaluates the signals from the crash sensors, decides within milliseconds whether airbags and seatbelt pretensioners are triggered in an accident, and monitors the system continuously. After an accident it stores crash data and locks itself.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster. The fault is also stored in the fault memory.

Why does the control unit 89170-02U20 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion on plugs, and voltage peaks from the vehicle electrical system.

Crash data remains in the unit and cannot be removed with an ordinary diagnostic tool. Airbag24 erases it during the repair, before the unit 89170-02U20 is returned.

The other causes concern the electronics themselves and their connections. Components lose performance over time, solder joints can go cold, and moisture acts on the contacts. Voltage peaks arise, for example, from a weak battery or from jump-starting.

How can you tell that the 89170-02U20 is defective?

The airbag warning light in the instrument cluster, which lights up permanently or intermittently, is the most important sign. In addition, fault messages appear in the instrument cluster, the diagnostic tool does not connect to the control unit, and the fault memory cannot be cleared.

• airbag warning light that stays on or lights up intermittently
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory that cannot be cleared

In the event of a defect, airbags and seatbelt pretensioners may fail to deploy in an emergency. Please have the finding checked promptly.

Which vehicles is the 89170-02U20 fitted in?

The control unit 89170-02U20 is used in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

You can find the individual vehicles here:

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

Comparing the part number on the label with this page gives you certainty that you are removing the correct unit. This comparison does nothing more. You should therefore have the fault memory read out beforehand, because only the log 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 89170-02N50, 89170-02T10, 89170-02W80, 89170-0F150.

How does the repair of the 89170-02U20 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 89170-02U20. Next, create a repair order online and pack the unit carefully for sending.

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. After that your own unit is returned to you. Testing, repair and function test at Airbag24 usually take 3–4 working days.

The order of work on the vehicle must be observed for safety reasons. 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 89170-02U20 get to Airbag24?

You send the control unit 89170-02U20 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order with the parcel and pack the control unit shock-proof.