Airbag control unit with part number 89170-02B30

What does the airbag control unit 89170-02B30 do?

The airbag control unit 89170-02B30 is responsible for the restraint system of Toyota. It processes the signals from the crash sensors, determines the triggering of airbags and seatbelt pretensioners within milliseconds in an accident, and checks the system continuously. After an accident, it stores crash data and locks itself.

Faults are displayed via the airbag warning light as soon as one is present. While the system works without faults, the unit goes unnoticed in everyday use.

The unit itself makes the triggering decision. To do so, it evaluates the sensor signals.

Why does the control unit 89170-02B30 fail?

The most common cause is crash data stored on the 89170-02B30 after an accident, even if no airbag has deployed; it cannot be erased with an ordinary diagnostic tool. Other causes are aged electronics, cold solder joints, moisture and corrosion on plugs, and voltage spikes, for example from a weak battery or a jump start.

The crash data arise from the accident itself. The unit records what it registered during the impact and does not delete these entries by itself. An airbag does not have to have deployed for this.

Electronic components age over time, and solder joints can be cold. Moisture promotes corrosion on the plug connections, which leads to contact problems. Voltage spikes in the vehicle electrical system can also affect the unit.

How can you tell that the 89170-02B30 is defective?

A defect on the 89170-02B30 shows through the airbag warning light in the instrument cluster, which lights up constantly or intermittently, and through a fault message in the instrument cluster. Even if the diagnostic tool cannot establish a connection to the control unit or the fault memory cannot be cleared, a malfunction is likely. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Do not ignore the warning light, because it is the vehicle's direct feedback on a problem in the restraint system. Have the system checked promptly. This will show whether the control unit is affected or whether a plug or cable is causing the fault.

Which vehicles is the 89170-02B30 fitted in?

The 89170-02B30 is fitted in these vehicles: Toyota Corolla E140 (2006-2013).

The following models are recorded for this control unit:

• Toyota Corolla E140 (2006-2013)

Match the part number on the label of the removed unit with this page on the unit itself, so that you can be sure you have the correct control unit. Whether it is defective is shown only by the fault memory read out, which also reveals whether a plug or cable is the cause. Have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 89170-0F032, 89170-12160.

How does the repair of the 89170-02B30 work?

The most important thing is the order: first have the fault memory read out and attach the log, then disconnect the battery and only then remove the 89170-02B30. Afterwards create a repair order online and send in the unit well packed. At Airbag24, testing, repair and function check usually take 3–4 working days.

The log helps the examination understand the starting situation. You work on the control unit only once the battery is disconnected.

Airbag24 checks the unit, replaces defective components, erases the crash data and carries out a function test. 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 89170-02B30 get to Airbag24?

You send the 89170-02B30 as a parcel, or you book 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 shockproof.