Airbag control unit with part number 89170-02D30

What does the airbag control unit 89170-02D30 do?

The airbag control unit 89170-02D30 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered. At the same time it monitors the system continuously and reports faults via the airbag warning light.

The evaluation runs not only in an emergency but in the background throughout every journey. If the unit detects a fault, it creates a fault entry that a diagnostic tool can read out. The fault memory is therefore the most important source of information when a problem is suspected.

After an accident the control unit stores crash data and locks itself. These entries belong to the records that the unit keeps after an accident.

Why does the control unit 89170-02D30 fail?

On the 89170-02D30, the most common cause after an accident is stored crash data, even if no airbag has triggered; a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at connectors, and voltage spikes, for example from a weak battery or jump-starting.

Crash data remains in the memory of the unit until it is removed during a repair. It is therefore not a question of airbag triggering alone, but a separate entry in the unit.

The remaining causes concern the electronics themselves. Over the years components age on the circuit board, solder joints can go cold, and moisture or corrosion at connectors disturb the signal transmission. Voltage spikes arise, for example, when the battery is weak or the vehicle is started with external power. Which cause is present cannot be said without reading out and examining the unit.

How can you tell that the 89170-02D30 is defective?

A defect on the 89170-02D30 shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition there is a fault message in the instrument cluster, no connection from the diagnostic tool to the control unit, or a fault memory that cannot be cleared.

If the warning light stays on permanently, that is a clear sign that the system has detected a fault. Even if it lights up only intermittently, the fault should not be ignored.

In an emergency, airbags and seatbelt pretensioners may then possibly not trigger. Therefore have the fault checked promptly and do not wait until the problem shows itself.

Which vehicles is the 89170-02D30 fitted in?

The control unit 89170-02D30 is fitted in these vehicles: Toyota Corolla E170 (2013-2018). The list shows which vehicles are known to us for this number.

The vehicles are listed in detail in the overview below.

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page. This only ensures that you have the right unit in front of you, and says nothing about its condition. Also have the fault memory read out beforehand, because only this record shows whether the control unit is defective or whether a connector or cable is the cause.

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 89170-02D30 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit 89170-02D30. Then create a repair order online and send the unit in well packed.

At Airbag24 the team checks the unit on the test bench. Defective components are repaired, stored crash data is erased, and then a function test follows. Afterwards your own, repaired unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This time covers only checking, repairing and testing at our end; removal, sending and shipping are not included. 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 89170-02D30 get to Airbag24?

You send the control unit 89170-02D30 as a parcel or arrange a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.