Airbag control unit with part number 89170-02J20

What does the airbag control unit 89170-02J20 do?

The airbag control unit 89170-02J20 controls the restraint system (SRS) for Toyota. It reads the signals from the crash sensors, decides in the event of an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Faults appear on the airbag warning light.

The unit constantly checks the sensors and firing circuits for irregularities. If it detects a fault, it stores it in the fault memory.

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

Why does the control unit 89170-02J20 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; they cannot be erased with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data remains in the unit after an impact, even if no airbag has deployed. A normal diagnostic tool does not remove it. Airbag24 deletes it during the repair.

Aged electronic components and cold solder joints form a separate group of possible causes. They can impair the function over time.

Moisture and corrosion at plug connections disrupt the contact. Voltage spikes, for example from a weak battery or jump-starting, put additional strain on the electronics.

How can you tell that the 89170-02J20 is defective?

The defect shows up as an airbag warning light in the instrument cluster that stays on permanently or intermittently, as a fault message in the instrument cluster, as a diagnostic tool that cannot find the control unit, and as a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may fail to trigger.

The warning light is the most important sign. It indicates a fault in the restraint system for as long as the cause remains.

• Airbag warning light stays on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool cannot find the control unit
• Fault memory cannot be cleared

Have the cause clarified promptly, as the restraint systems are affected.

Which vehicles is the 89170-02J20 fitted in?

The control unit 89170-02J20 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The list of vehicles for which this part number is known follows:

• Toyota Corolla E170 (2013-2018)

Comparing the part number on the label of the removed unit with this page only shows that it is the right unit. It does not reveal the cause. Only the fault memory read out beforehand shows whether the control unit is defective or whether a plug or a cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 89170-02C60, 89170-02C70, 89170-02C80, 89170-02C90, 89170-12280, 89170-12340.

How does the repair of the 89170-02J20 work?

First read out the fault memory and enclose the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit. At Airbag24, inspection, repair and testing usually take 3–4 working days.

The order is for your safety: read out the fault memory, disconnect the battery, and only then remove the unit. Pack the unit well before you submit the repair order.

Airbag24 examines the unit on the test bench and repairs defective components. Stored crash data is deleted by Airbag24, followed by a function test. The unit of your own is then 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 89170-02J20 get to Airbag24?

You send the unit as a parcel or arrange a UPS collection for an extra charge. After the repair, UPS takes the unit from Airbag24 back to you.

Place the printed repair order in the parcel and pad the unit shock-proof.