Airbag control unit with part number 89170-02S50

What does the airbag control unit 89170-02S50 do?

The airbag control unit 89170-02S50 controls the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors, decides in an accident within split seconds whether airbags and seatbelt pretensioners are triggered, and monitors the system constantly. It shows faults via the airbag warning light.

The unit works in the background while driving and checks the connected components. If it detects a deviation, it records it in the fault memory.

After an accident, it stores crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 89170-02S50 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Other causes are essentially ageing, contact problems and voltage in the vehicle electrical system.

Crash data is created as soon as the unit registers an impact, and it remains stored even if no airbag has fired.

In addition, the following causes are possible:

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example with a weak battery or a jump start

How can you tell that the 89170-02S50 is defective?

Signs include an airbag warning light that stays on permanently or intermittently, a fault message in the instrument cluster, a diagnostic tool with no connection to the control unit, and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

Watch for the following indications:

• Airbag warning light permanently on
• Airbag warning light on intermittently
• Fault message in the instrument cluster
• Diagnostic tool finds no connection
• Fault memory cannot be cleared

Have the system checked promptly if any of these signs appear.

Which vehicles is the 89170-02S50 fitted in?

The airbag control unit 89170-02S50 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The following vehicles are assigned to 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 establishes that it is the correct unit. Read out the fault memory in advance as well, since only the result shows whether the control unit is defective or a connector 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 89170-02S50 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Next, send in the well-packed unit. At Airbag24, processing usually takes 3–4 working days.

At Airbag24, the unit is examined on the test bench, defective components are repaired, stored crash data is erased and a functional test is carried out.

The unit is then returned to you. The order of removal serves safety and must be followed.

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 89170-02S50 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge, and after the repair Airbag24 returns it via UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.