Airbag control unit with part number 89170-12L70

What does the airbag control unit 89170-12L70 do?

The airbag control unit 89170-12L70 is the central control unit of the restraint system for Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

During operation the control unit monitors the entire system without interruption, from the sensors to the trigger circuits. After an accident it stores crash data and locks itself.

Why does the control unit 89170-12L70 fail?

On the 89170-12L70, the most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes may also play a part.

Crash data stays in memory until it is removed deliberately. Airbag24 erases it during the repair.

The other causes develop over a longer period: moisture and corrosion impair contacts, and voltage spikes, for example from a weak battery or jump-starting, can stress components.

How can you tell that the 89170-12L70 is defective?

On the 89170-12L70, a defect shows through an airbag warning light in the instrument cluster that stays on permanently or intermittently, through an error message, and through a diagnostic tool without a connection to the control unit. If the fault memory cannot be cleared, an inspection is necessary.

The warning light is the most important warning sign. When it is on, the system is operating in a fault state, and airbags and seatbelt pretensioners may not be able to trigger in an emergency.

Which vehicles is the 89170-12L70 fitted in?

Whether your car is affected can be seen by comparing it with the vehicle list. The airbag control unit 89170-12L70 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The vehicles in detail:

• Toyota Corolla E170 (2013-2018)

(a) Compare the part number on the label of the removed unit with this page; this ensures that it is the right unit. (b) Have the fault memory read out beforehand, because only that shows whether the control unit is defective or a plug or a 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 89170-12L70 work?

First read out the fault memory of the 89170-12L70 and enclose the log, then disconnect the battery and only then remove the unit. Next, create a repair order online and send the unit in well packed. At Airbag24, inspection, repair and function test usually take 3–4 working days.

The order of these steps is for your safety. Airbag24 tests the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. 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 89170-12L70 get to Airbag24?

You send the control unit 89170-12L70 as a parcel or book 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.