Airbag control unit with part number 89170-02490

What does the airbag control unit 89170-02490 do?

The airbag control unit 89170-02490 is the central control unit of the restraint system for Toyota. It evaluates the signals from the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

The sensors supply measured values constantly, and the evaluation runs in the background without a pause. Only from this does it follow which restraint devices are to respond.

After an accident, the unit stores crash data and locks itself. A reported fault is therefore worth checking promptly.

Why does the control unit 89170-02490 fail?

The most common cause is stored crash data after an accident, even if no airbag has deployed, and a standard diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Other causes may also come into question:

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

Crash data remains in the memory after an accident, even if airbags and seatbelt pretensioners did not trigger. A standard diagnostic tool cannot remove it, so the fault memory stays occupied.

How can you tell that the 89170-02490 is defective?

The airbag warning light in the instrument cluster lights up on the 89170-02490 permanently or intermittently. Accompanying it, a fault message appears in the instrument cluster, the diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared.

If the warning light is on, airbags and seatbelt pretensioners may not trigger in an emergency. This affects the protective effect of the entire system.

The warning light indicates the defect and calls for an inspection, regardless of how the vehicle behaves in everyday use.

Which vehicles is the 89170-02490 fitted in?

The control unit 89170-02490 is fitted in these vehicles: Toyota Corolla E120 (2001-2004) and E120 Facelift (2004-2007).

The fitment covers the following models:

• Toyota Corolla E120 (2001-2004)
• Toyota Corolla E120 Facelift (2004-2007)

Compare the part number on the label of the removed unit with this page, as this only confirms that you have the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02180, 89170-02240, 89170-02390, 89170-02411, 89170-02G60, 89170-12160.

How does the repair of the 89170-02490 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed 89170-02490.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit is returned 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 89170-02490 get to Airbag24?

You send the control unit 89170-02490 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 into the parcel and pack the unit shock-resistant.