Airbag control unit with part number 89170-02Q40

What does the airbag control unit 89170-02Q40 do?

The airbag control unit 89170-02Q40 controls the restraint system (SRS) in Toyota and connects the crash sensors to the triggers. In an accident it decides which airbags and seatbelt pretensioners are triggered, and it monitors the system during operation.

It records faults in the fault memory and reports them via the airbag warning light.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-02Q40 fail?

For the 89170-02Q40, the most common cause is the storage of crash data after an accident, even if no airbag was triggered. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump leads

Crash data cannot be removed with an ordinary diagnostic tool. Airbag24 erases it during the repair.

How can you tell that the 89170-02Q40 is defective?

A defect on the 89170-02Q40 first affects the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Typical signs are also fault messages and a diagnostic tool that cannot establish a connection.

• airbag warning light, permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool without a connection to the control unit
• fault memory that cannot be cleared

In such a case, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency.

Have the warning light checked promptly, because the light makes the fault visible.

Which vehicles is the 89170-02Q40 fitted in?

The unit 89170-02Q40 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022). A comparison of the part number on the label with this page ensures that you have the right unit.

In detail, these models are listed:

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

Several things are important before removal. Have the fault memory read out, so that it is clear whether the control unit is defective or whether a plug or cable is the cause. A comparison of the label with this page only confirms that it is the right unit.

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 89170-02Q40 work?

First have the fault memory read out, disconnect the battery and remove the control unit 89170-02Q40. Then create a repair order online and send in the well-packed unit. At Airbag24 processing usually takes 3–4 working days.

The log of the fault memory goes with the unit. Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test.

Afterwards your own unit is returned. 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 89170-02Q40 get to Airbag24?

You send the control unit 89170-02Q40 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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