Airbag control unit with part number 89170-02D20

What does the airbag control unit 89170-02D20 do?

The airbag control unit 89170-02D20 is responsible for the restraint system (SRS) in vehicles from Toyota. In a crash it reads the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners trigger. It also monitors the system continuously and shows faults via the airbag warning light.

Monitoring covers the power supply, the lines to the firing units and the sensors.

An accident causes the unit to store crash data and lock itself.

Why does the control unit 89170-02D20 fail?

Crash data from an accident is the most common cause, even if no airbag triggered; ordinary diagnostic tools cannot remove it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from weak batteries or jump-starting. Airbag24 erases the crash data during repair.

The entry remains in the memory until it is removed during repair. That no airbag triggered changes nothing about this.

The other causes build up over time. Solder joints lose strength, moisture attacks the contacts, and electronic components age.

Voltage spikes occur when the battery weakens or a vehicle is started using jump leads.

How can you tell that the 89170-02D20 is defective?

Typical signs of a defect are the airbag warning light in the instrument cluster, which lights up permanently or intermittently, a fault message in the instrument cluster, and a diagnostic tool with no connection to the control unit. A fault memory that cannot be cleared also counts. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the signal the unit itself sends. Whoever ignores the display loses the chance to act early.

Which vehicles is the 89170-02D20 fitted in?

The airbag control unit 89170-02D20 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The listing names the vehicles recorded for this number.

• Toyota Corolla E170 (2013-2018)

Matching the part number on the label of the unit with this page only confirms that you have the right unit. Whether the control unit is defective or a plug or cable is the cause is decided only by the fault memory read out beforehand.

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 89170-02D20 work?

The process starts with you: have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Next create a repair order online and send the unit off well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is checked on the test bench, defective components are replaced, the stored crash data is erased, and a function test follows. 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 89170-02D20 get to Airbag24?

You send the unit as a parcel or book UPS collection for an extra charge. Airbag24 sends it back by UPS after repair.

Put the printed repair order into the parcel. Pack the unit shockproof.