Airbag control unit with part number 89170-02A90

What does the airbag control unit 89170-02A90 do?

The airbag control unit 89170-02A90 forms the central control unit of the restraint system (SRS) for Toyota. It continuously checks the signals from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners to trigger. After an accident, it stores crash data and locks itself.

The unit reports faults in the system via the airbag warning light in the instrument cluster. This lets you, as the driver, recognise that something is wrong with the restraint system. The safety of the occupants therefore depends largely on this control unit.

Why does the control unit 89170-02A90 fail?

Most common cause with the 89170-02A90: crash data stored after an accident that cannot be erased with a standard diagnostic tool. With this control unit, erasing the crash data is often not possible; if you wish to have it erased, contact Airbag24 briefly before sending the unit in, and Airbag24 will then check the part number. Other causes are aged electronic components, moisture and corrosion, and voltage spikes.

The unit also stores crash data when no airbag has deployed.

Aged electronic components, cold solder joints and moisture at plug connections can also cause the failure. Voltage spikes, for example from a weak battery or jump-starting, are among the causes as well.

How can you tell that the 89170-02A90 is defective?

A fault in the 89170-02A90 becomes visible through the airbag warning light in the instrument cluster. This may be accompanied by fault messages, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool gets no connection to the control unit
• Fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. Have the finding checked promptly. The underlying cause cannot be determined from these signs alone. Signs of this kind should not be ignored.

Which vehicles is the 89170-02A90 fitted in?

The control unit 89170-02A90 is fitted in this vehicle: Toyota Corolla E150 (2006-2013). Whether your car is one of them is shown by checking it against the list on this page.

The following vehicles are listed for this part number:

• Toyota Corolla E150 (2006-2013)

You should still compare the labels, as this shows whether it is the correct unit. Whether the control unit itself is faulty or a connector or cable is causing the fault is shown only by the fault memory. Therefore, have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 152100-4560, 85942-12010, 89170-02N50, 89170-0F042, 89170-12160, 89170-42D50.

How does the repair of the 89170-02A90 work?

First have the fault memory read out and enclose the log; only then disconnect the battery and remove the 89170-02A90. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components and carries out a functional test. This test checks the unit before it is sent back. It is then returned to you. If you want the crash data erased, contact Airbag24 briefly before sending the unit in.

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 89170-02A90 get to Airbag24?

You send the 89170-02A90 in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant. Make sure the parcel is securely sealed.