Airbag control unit with part number 89170-12D50

What does the airbag control unit 89170-12D50 do?

The airbag control unit 89170-12D50 coordinates the SRS restraint system of Toyota. In an impact it processes the measured values from the sensors and decides within milliseconds which airbags and seatbelt pretensioners fire. It monitors the state of the entire system without interruption.

It records faults in the fault memory and shows them via the airbag warning light. This display is the first visible feedback to you that something in the system is wrong.

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

Why does the control unit 89170-12D50 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered; a usual diagnostic tool cannot remove it. In addition there are aged components, cold solder joints, moisture, corrosion and voltage spikes.

Crash data is the record that the control unit secures after an impact. At Airbag24 it is deleted during the repair, which no diagnostic tool can do.

The other causes at a glance:

• Ageing electronic components lose performance and eventually fail.
• Cold solder joints can interrupt contacts.
• Moisture and corrosion at plug connections disturb the signal transmission.
• Voltage spikes, for example from a weak battery or jump-starting, stress the electronics.

How can you tell that the 89170-12D50 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through an error message in the instrument cluster. In addition, the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared.

If the control unit reacts in this way, airbags and seatbelt pretensioners may not trigger in an emergency. The warning light makes the finding visible as soon as it occurs.

Such a sign should therefore be checked promptly, even if the vehicle continues to drive.

Which vehicles is the 89170-12D50 fitted in?

The airbag control unit 89170-12D50 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

Here follows the overview of the vehicles that belong to this part number.

• Toyota Corolla E170 (2013-2018)

Proceed in two steps. First check whether the part number on the label of the removed unit matches this page; this only confirms that you have the correct unit. Then have the fault memory read out, 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 89170-12D50 work?

First read out the fault memory and enclose the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and pack the unit carefully for dispatch. Airbag24 then checks, repairs and tests it.

At Airbag24 the control unit is examined on the test bench and defective components are repaired. Stored crash data is deleted, followed by a function test, and then your own unit goes back.

Processing at Airbag24 usually takes 3–4 working days, and this period covers only checking, repairing and testing. 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 89170-12D50 get to Airbag24?

You can send the unit in yourself or book a UPS collection for an extra charge. After the repair it is sent back to you by UPS.

The printed repair order belongs in the parcel, and the unit is packed shock-resistant.