Airbag control unit with part number 89170-02N70

What does the airbag control unit 89170-02N70 do?

At Toyota, the airbag control unit 89170-02N70 controls the restraint system (SRS). It reads the crash sensors, decides in a crash on airbags and seatbelt pretensioners, and reports faults on the airbag warning light.

In operation it continuously checks the sensors, the wiring and the firing circuits for irregularities.

After an accident it stores crash data and locks itself. The lock is lifted exclusively by the repair.

Why does the control unit 89170-02N70 fail?

With the 89170-02N70, stored crash data from an accident is the most common cause, even if no airbag has fired. A normal diagnostic tool cannot erase this data.

The unit records the event, and the record remains regardless of how the car looks afterwards.

In addition, ageing electronic components, cold solder joints, and moisture and corrosion on plug connections play a role. Voltage spikes, for example with a weak battery or a jump start, are also a strain.

How can you tell that the 89170-02N70 is defective?

The signs on the 89170-02N70 show up as the airbag warning light in the instrument cluster, which is on constantly or intermittently. A fault message, no contact from the diagnostic tool, or a fault memory that cannot be cleared may come on top.

Typical features are:

• Airbag warning light on constantly or recurring
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

As long as such signs are present, airbags and seatbelt pretensioners may fail to trigger in an emergency. A prompt check is therefore the better choice.

Which vehicles is the 89170-02N70 fitted in?

The 89170-02N70 is fitted in these vehicles: Toyota Corolla E210 (2018-2022) and E210 Facelift (from 2022). The assignment comes from the part number held for Toyota.

The list below shows the vehicle types recorded for this part number.

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

Before you remove anything, have the fault memory read out. That way there is no doubt that the control unit itself is causing the fault and not a cable. Then compare the part number on the label.

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 89170-02N70 work?

First read out the fault memory and remove the control unit 89170-02N70. Afterwards send it in once you have created the repair order; Airbag24 checks, repairs, erases the crash data and tests the unit.

The battery is disconnected, the log goes into the parcel, and the packaging should be sturdy.

At Airbag24, processing, that is checking, repairing and testing, usually takes 3–4 working days. Afterwards you receive your own unit back.

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 89170-02N70 get to Airbag24?

You can send the control unit 89170-02N70 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Enclose the printed repair order in the parcel and pack the control unit shockproof.