Airbag control unit with part number 89170-02270

What does the airbag control unit 89170-02270 do?

The airbag control unit 89170-02270 is the central control unit of the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. It shows faults in the system via the airbag warning light.

The unit works in the background and checks the entire airbag system continuously for irregularities. It monitors sensors, firing circuits and seatbelt pretensioners, so that everything is ready in an emergency.

After an accident, the control unit stores crash data and then locks itself.

Why does the control unit 89170-02270 fail?

The most common causes are crash data stored after an accident, even if no airbag has fired. A normal diagnostic tool cannot delete this data. Ageing components, cold solder joints, moisture and voltage spikes are also possible causes.

Crash data remains stored after an accident, even if the vehicle then drives on without any noticeable problems. A commercially available diagnostic tool cannot remove it. Airbag24 deletes it during the repair.

Further causes are in particular:

• ageing electronic components on the circuit board
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump-start

How can you tell that the 89170-02270 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when there is a fault. In addition, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

If the light stays on or flickers at intervals, that is a reason to act promptly.

This indication is the system's own warning. It is therefore important to take it seriously.

Which vehicles is the 89170-02270 fitted in?

For Toyota, the device with part number 89170-02270 is fitted in these vehicles: Toyota Corolla E120 (2001-2004) and E120 Facelift (2004-2007).

The vehicle assignments stored at Airbag24 are shown in the overview below.

• 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. The comparison only confirms that it is the right unit and says nothing about the cause. Therefore have the fault memory read out first, because only the log shows whether the control unit is faulty 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 89170-02270 work?

First have the fault memory read out and attach the log to the parcel. Then disconnect the battery and only afterwards remove the control unit 89170-02270. Next, create a repair order online and send in the well-packed unit. Checking, repairing and the function test at Airbag24 usually take 3–4 working days.

Airbag24 checks the control unit on the test bench, replaces faulty components, deletes stored crash data and carries out a function test. Afterwards 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 89170-02270 get to Airbag24?

You send the control unit 89170-02270 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.