Airbag control unit with part number 89170-02S70

What does the airbag control unit 89170-02S70 do?

After an accident the airbag control unit 89170-02S70 stores crash data and locks itself. In normal operation it controls the restraint system (SRS) of Toyota, evaluates the crash sensors and, in an accident, decides whether airbags and seatbelt pretensioners are triggered.

The sensors are evaluated in fractions of a second. At the same time the unit monitors the entire system.

Faults are reported via the airbag warning light in the instrument cluster.

Why does the control unit 89170-02S70 fail?

The most common cause is crash data stored after an accident, even without an airbag deployment. A normal diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data entry remains in the unit until the repair removes it. A workshop diagnosis therefore fails at the connection to the control unit.

Ageing components and cold solder joints lead to contact problems. Moisture and corrosion at the plug connections disturb the signals. Voltage spikes, for example from a weak battery or a jump start, strain the electronics.

How can you tell that the 89170-02S70 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In that case airbags and seatbelt pretensioners may fail to deploy in a crash.

• Airbag warning light stays on
• Airbag warning light comes on only intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection
• Fault memory cannot be cleared

Have these signs checked before you continue to use the vehicle, because the warning concerns the entire restraint system.

Which vehicles is the 89170-02S70 fitted in?

The 89170-02S70 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The overview lists the vehicles stored for this part number.

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

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. The fault memory should be read out beforehand, because only then does it become clear whether the control unit is defective or 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 89170-02S70 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and afterwards remove the control unit. Online, you create a repair order 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 where necessary and erases the stored crash data. A function test follows, then the 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 89170-02S70 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 by UPS.

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