Airbag control unit with part number 89170-02R90

What does the airbag control unit 89170-02R90 do?

The airbag control unit 89170-02R90 controls the SRS restraint system of Toyota. In an impact it evaluates the signals from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

During operation it continuously monitors the system. Faults appear on the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 89170-02R90 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Further triggers are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool leaves crash data untouched, because it cannot erase it.

A weak battery or a jump start can generate voltage spikes. Only the fault memory shows which cause applies.

How can you tell that the 89170-02R90 is defective?

A defect shows up on the airbag warning light, which stays on in the instrument cluster permanently or intermittently, and in error messages. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

These signs are also present:

• Connecting the diagnostic tool to the control unit does not work.
• The fault memory cannot be cleared.

If you find one of these, have the system checked.

Which vehicles is the 89170-02R90 fitted in?

The airbag control unit 89170-02R90 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The following list shows the vehicles on record for this unit:

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

You compare the part number on the label of the removed unit with this page; this only confirms the identity. Have the fault memory read out beforehand, because only its result shows whether the control unit is defective or whether connectors or cables are 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 89170-02R90 work?

The fault memory is read out first and the log is enclosed; then the battery is disconnected and the control unit removed. Next, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes 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 89170-02R90 get to Airbag24?

You either send the unit in as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back to you by UPS after the repair.

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