Airbag control unit with part number 89170-02S10

What does the airbag control unit 89170-02S10 do?

The airbag control unit 89170-02S10 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

The sensor data constantly converges in the unit. From it, the unit calculates whether an impact requires deployment, and activates only the restraint devices that match.

During normal operation the control unit monitors the entire system. It stores detected faults and displays them via the airbag warning light in the instrument cluster. After an accident it records crash data and locks itself.

Why does the control unit 89170-02S10 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. They cannot be cleared with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data remains stored in the unit after an impact, even if no airbag has fired. This cause can therefore occur, and the data cannot be removed without intervention on the unit.

Aged components and cold solder joints lose their reliability over time. Moisture and corrosion on plug connectors disrupt the data exchange that the function requires.

Voltage spikes, for example from a weak battery or when connecting a jump-start, additionally stress the electronics.

How can you tell that the 89170-02S10 is defective?

A defect shows up as an airbag warning light that lights up permanently or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not deploy.

The airbag warning light in the instrument cluster is the clearest sign. It shows the defect as soon as the system registers a fault and stays on permanently or intermittently.

An error message in the instrument cluster can come with it. If the diagnostic tool cannot establish a connection to the control unit, have the cause clarified promptly.

Which vehicles is the 89170-02S10 fitted in?

The 89170-02S10 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The list shows the vehicles that are recorded for this part number.

• 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 only confirms that it is the correct unit.

Have the fault memory read out beforehand. Only this 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 89170-02S10 work?

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

Airbag24 checks the unit on the test bench and replaces defective components. Stored crash data is deleted, followed by a function test. Processing at Airbag24 usually takes 3–4 working days.

Afterwards, your own unit 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 89170-02S10 get to Airbag24?

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

Put the printed repair order in the parcel and pack the unit shockproof.