Airbag control unit with part number 89170-02P90

What does the airbag control unit 89170-02P90 do?

The airbag control unit 89170-02P90 coordinates the restraint system (SRS) in vehicles of Toyota. It evaluates the signals of the impact sensors and determines in a crash which airbags and seatbelt pretensioners are triggered.

The evaluation takes place within a fraction of a second. Between journeys, the unit checks the connected components and displays faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself. This must be taken into account during diagnosis and repair.

Why does the control unit 89170-02P90 fail?

The most common cause is stored crash data, even if no airbag was triggered. A standard diagnostic tool cannot erase it, so the fault remains.

Airbag24 erases this crash data during the repair, so the unit can then be checked without this legacy load.

Otherwise, faults occur because components age over time. Soldered joints can go cold, and moisture or corrosion at plugs disturb the contact. Voltage spikes, for example from a weak battery or a jump start, can damage the electronics.

These are general indications, not a diagnosis of the specific unit.

How can you tell that the 89170-02P90 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and a fault message can appear alongside it. If no connection to the diagnostic tool can be established, or the fault memory remains unchanged, this indicates a defect.

Many drivers take a light that comes on at start-up to be harmless. If the light stays on or comes back, a careful check is worthwhile.

In this state, airbags and seatbelt pretensioners may not be able to deploy in an emergency. The fault memory shows whether the control unit itself is affected.

Which vehicles is the 89170-02P90 fitted in?

The control unit 89170-02P90 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022).

The overview below lists the vehicles that we have on record for this control unit.

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

Before you remove the unit, have the fault memory read out. Afterwards, compare the part number on the label of the removed unit with the number on this page, so that you can be sure the control unit and not a cable is affected.

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 89170-02P90 work?

First read out the fault memory and enclose the log with the unit. Then disconnect the battery, remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Pack the unit well after removal and send it in. Make sure that no parts are loose in the parcel.

At Airbag24, the unit is checked, defective components are repaired, and the crash data is removed. A function test concludes the work, and then 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 89170-02P90 get to Airbag24?

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

The printed repair order goes into the parcel. The control unit should be packed shockproof.