Airbag control unit with part number 89170-02D10

What does the airbag control unit 89170-02D10 do?

The airbag control unit 89170-02D10 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the impact sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

In addition, it monitors the entire system continuously. If it finds a fault, it shows this via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-02D10 fail?

The most common cause with the control unit 89170-02D10 is crash data that was stored after an accident, even though no airbag was triggered. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

A normal diagnostic tool cannot erase crash data, so it remains stored in the control unit.

The other causes develop over a longer period. Cold solder joints and corrosion are hardly visible from outside, whereas voltage spikes affect the electronics briefly.

How can you tell that the 89170-02D10 is defective?

A defect in the 89170-02D10 shows up as the airbag warning light, as fault messages in the instrument cluster and as a diagnostic tool with no connection to the control unit. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Typical signs are:

• The airbag warning light in the instrument cluster stays on permanently or intermittently.
• The instrument cluster shows a fault message.
• The diagnostic tool cannot connect to the control unit.
• The fault memory cannot be cleared.

The warning light is therefore the direct indication of a fault in the system. Only reading out the fault memory shows where the fault lies.

Which vehicles is the 89170-02D10 fitted in?

Before removal, it is worth checking the part number 89170-02D10. The control unit is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles for which this part number is recorded:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page. That way you know you have the right unit in front of you. Whether the control unit is actually defective is shown only by reading out the fault memory, because a plug or a cable can also be the cause. Please have 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 89170-02D10 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 89170-02D10. Next, create a repair order online and send in the well-packed unit.

At Airbag24, the team checks the unit on the test bench and repairs defects in the affected components. It then erases the stored crash data and carries out a function test. Afterwards your own unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days.

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 89170-02D10 get to Airbag24?

You send the control unit 89170-02D10 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shock-proof.