Airbag control unit with part number 89170-02P40

What does the airbag control unit 89170-02P40 do?

The airbag control unit 89170-02P40 is the central control unit of the restraint system (SRS) in vehicles of Toyota. It processes the signals from the crash sensors, decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The monitoring runs in the background. If the unit detects a fault, it appears via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and locks itself. This state is part of how the unit works.

Why does the control unit 89170-02P40 fail?

Stored crash data is the most common cause on the 89170-02P40, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains stored in the control unit, and a normal diagnostic tool cannot erase it. An accident without an airbag deployment therefore still leads to a malfunction.

Electronic components age, and solder joints can go cold. Moisture and corrosion attack the plug connections, and voltage spikes arise, for example, from a weak battery or when a jump start is connected.

How can you tell that the 89170-02P40 is defective?

The airbag warning light lights up constantly or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the 89170-02P40, and the fault memory cannot be cleared.

In a critical situation, the airbags and seatbelt pretensioners may not be able to deploy. The warning must therefore be taken seriously.

The warning light reports the defect itself, so you do not have to search for it laboriously.

Which vehicles is the 89170-02P40 fitted in?

The airbag control unit 89170-02P40 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The following list shows the vehicles assigned to this part number.

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

First compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit is defective or whether 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 89170-02P40 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. You send the well-packed unit in, and Airbag24 usually processes it within 3–4 working days.

The removal takes place only after the battery has been disconnected. This sequence is prescribed for safety reasons.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data, and then runs a function test. Your own unit is returned to you afterwards.

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 89170-02P40 get to Airbag24?

You send the control unit 89170-02P40 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 in the parcel and pack the unit shockproof.