Airbag control unit with part number 89170-12D70

What does the airbag control unit 89170-12D70 do?

The 89170-12D70 is the airbag control unit for the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors, determines within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system permanently.

It reports any faults that occur via the airbag warning light in the instrument cluster. After a crash, it stores crash data and locks itself; the lock is only lifted by the repair.

Why does the control unit 89170-12D70 fail?

Stored crash data is the most common cause, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Airbag24 erases the crash data during the repair. Which of the other causes applies to your unit is only established by the check.

How can you tell that the 89170-12D70 is defective?

A defect in the 89170-12D70 shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster, through a lack of connection to the diagnostic tool, and through a fault memory that cannot be cleared.

The warning light is the most visible sign. The fault message in the instrument cluster supplements this indication, and the connection and fault memory can be checked with the diagnostic tool.

In an emergency, airbags and seatbelt pretensioners may fail to trigger if these signs are present. Do not treat the warning as a trifle.

Which vehicles is the 89170-12D70 fitted in?

The airbag control unit 89170-12D70 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

This list shows the vehicles assigned:

• Toyota Corolla E170 (2013-2018)

You compare the part number to confirm that you have the right unit. Have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02C70, 89170-12180, 89170-12G10, 89170-12N50.

How does the repair of the 89170-12D70 work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery and only after that remove the control unit 89170-12D70. Next, create a repair order online and send in the unit well packed. At Airbag24, testing, repairing and checking take 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, repairs 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 89170-12D70 get to Airbag24?

You send the control unit 89170-12D70 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

You place the printed repair order in the parcel, and pack the unit shock-proof.