Airbag control unit with part number 89170-12E51

What does the airbag control unit 89170-12E51 do?

The airbag control unit 89170-12E51 is the central control unit of the restraint system (SRS) of Toyota. It processes the crash sensor data, decides in an accident within milliseconds about airbags and seatbelt pretensioners, and monitors the system continuously.

Faults found are shown via the airbag warning light. Monitoring works in the background while the vehicle is in operation.

After an accident it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-12E51 fail?

Most often, failure is caused by crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it. In addition, ageing electronics, cold solder joints, moisture and corrosion, and voltage spikes come into question.

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes from the vehicle electrical system

Crash data remains stored in the unit until Airbag24 removes it during the repair. Which cause applies in an individual case only becomes clear from the test.

How can you tell that the 89170-12E51 is defective?

An airbag warning light that stays on in the 89170-12E51 permanently or intermittently is the most important sign. Fault messages in the instrument cluster, a missing connection of the diagnostic tool and a fault memory that cannot be cleared are also signs.

Both permanent and intermittent illumination of the warning light are serious, because in both cases there is a fault in the restraint system. The light indicates the finding regardless of how the vehicle is being driven.

As long as the fault persists, airbags and seatbelt pretensioners may not be able to trigger in an emergency. An early check therefore provides clarity.

Which vehicles is the 89170-12E51 fitted in?

The control unit 89170-12E51 is fitted in the following vehicles: Toyota Corolla E170 (2013-2018).

The list shows the vehicles we have on record for this part number.

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Have the fault memory read out beforehand, because this result alone 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 89170-12E51 work?

Processing at Airbag24 usually takes 3–4 working days. First have the fault memory read out 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.

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. After that the unit is returned 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 89170-12E51 get to Airbag24?

You send the unit in 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 in the parcel and pack the unit shockproof.