Airbag control unit with part number 89170-02140

What does the airbag control unit 89170-02140 do?

The airbag control unit 89170-02140 is the control unit of the SRS restraint system for Toyota. It reads the crash sensors, selects the appropriate airbags and seatbelt pretensioners in an impact, and checks the system for faults continuously. Detected faults appear on the airbag warning light.

After an accident it stores crash data and locks itself. It informs the driver only via the warning light and the instrument cluster.

This combination of sensors and evaluation forms the core of the restraint technology in the vehicle.

Why does the control unit 89170-02140 fail?

Crash data stored in the unit after an accident is the most frequent reason for a failure, even if no airbags were triggered; an ordinary diagnostic tool cannot remove it. Aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes are further causes.

That no airbag was triggered therefore says nothing about what is stored in the memory.

The other triggers develop over time: components wear out, and plug connectors begin to corrode. Voltage spikes, for example from a weak battery, also count.

How can you tell that the 89170-02140 is defective?

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

The light coming on is a finding of the system itself and calls for a check.

Which vehicles is the 89170-02140 fitted in?

The control unit 89170-02140 is fitted in these vehicles: Toyota Corolla E120 (2001-2004) and E120 Facelift (2004-2007).

The list follows:

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

Comparing the part number on the label with this page clarifies that it is the right unit. Having the fault memory read out provides the actual answer, because only the log shows whether the control unit is defective or whether a plug or 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 89170-02140 work?

The first step is the fault memory, which you have read out and whose log you enclose with the unit. Then disconnect the battery; only after that remove the 89170-02140. Next, create a repair order online and send the unit in. Airbag24 checks it, repairs defective components, erases stored crash data and tests the unit before it is sent back.

For the work at the Airbag24 workshop, allow 3–4 working days as a rule.

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 89170-02140 get to Airbag24?

The control unit 89170-02140 goes to Airbag24 as a parcel, or you arrange a UPS collection for an extra charge. UPS handles the return shipment after the repair.

The printed repair order belongs in the parcel, and the unit must be packed shock-resistant.