Airbag control unit with part number 89170-02T50

What does the airbag control unit 89170-02T50 do?

The airbag control unit 89170-02T50 is the control unit of the restraint system (SRS) for Toyota. It evaluates the crash sensors and determines within a few milliseconds which airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously. If it detects a fault, it reports this via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-02T50 fail?

With the 89170-02T50, the most common cause is crash data stored after an accident, even without a triggered airbag. An ordinary diagnostic tool cannot remove this data. Other possible causes include aged electronics, cold solder joints, moisture or corrosion on plugs, and voltage spikes.

The crash data remains in the unit until Airbag24 erases it during the repair. An ordinary diagnostic tool does not reach it.

The other causes relate to ageing and environmental influences. Electronic components change over the years, solder joints can go cold, and moisture attacks the contacts. Voltage spikes, for example from a weak battery or a jump-start, also strain the unit.

How can you tell that the 89170-02T50 is defective?

On the 89170-02T50, a defect shows through the airbag warning light, which lights up permanently or intermittently, through an error message in the instrument cluster, through a missing connection to the diagnostic tool or through a fault memory that cannot be cleared.

• Airbag warning light permanently or intermittently on
• Error message in the instrument cluster
• Diagnostic tool cannot establish a connection
• Fault memory cannot be cleared

With such a finding, airbags and seatbelt pretensioners may not be able to deploy in an emergency. The light indicates the finding, so a check without delay makes sense.

Which vehicles is the 89170-02T50 fitted in?

Whether your vehicle matches the unit can be clarified with the details on your vehicle registration document. The control unit 89170-02T50 is intended for Toyota and fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The vehicles are recorded in this list:

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

Have the fault memory read out before removal, because the log shows whether the control unit itself is affected or whether a plug or a cable is the cause. Compare the part number on the label with this page. That only confirms that it is the right unit; it says nothing about 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 89170-02T50 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, only then remove the control unit 89170-02T50 and create a repair order online. Next, send in the unit, well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a functional test. Processing usually takes 3–4 working days.

Your own 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 89170-02T50 get to Airbag24?

You send the 89170-02T50 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back by UPS after the repair.

Put the printed repair order in the parcel. Pack the unit shock-resistant.