Airbag control unit with part number 89170-52F40

What does the airbag control unit 89170-52F40 do?

The airbag control unit 89170-52F40 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors and determines in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation the unit monitors the system continuously. If it detects a fault, it shows this via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. The function of the entire system depends on a control unit that works flawlessly.

Why does the control unit 89170-52F40 fail?

For the 89170-52F40, the most common cause is an accident with stored crash data, even if no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes come on top of this.

A normal diagnostic tool cannot delete crash data. Airbag24 deletes it during the repair.

Electronic components can age over time, and solder joints can go cold. Moisture and corrosion on the contacts are a further cause.

Voltage spikes, for example from a weak battery or from jump-starting, additionally stress the electronics.

How can you tell that the 89170-52F40 is defective?

On the control unit 89170-52F40 you recognise a fault by the airbag warning light in the instrument cluster when it lights up permanently or intermittently. An error message in the instrument cluster, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared are also signs.

In an emergency, airbags and seatbelt pretensioners may not deploy. Therefore do not overlook these signs.

Which vehicles is the 89170-52F40 fitted in?

The control unit 89170-52F40 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017). The information comes from the stored assignment to the part number.

The following list shows the vehicles at a glance:

• Toyota Yaris XP130 2nd Facelift (2017-2020)
• Toyota Yaris XP130 (2010-2014)
• Toyota Yaris XP130 1st Facelift (2014-2017)

Compare the part number on the label of the removed unit with this page. This only establishes that you have the right unit in front of you. Have the fault memory read out beforehand, because only the result 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 2310009950, 89170-0D300, 89170-0D320, 89170-0D590, 89170-0D600, 89170-0D620.

How does the repair of the 89170-52F40 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. For checking, repairing and testing at Airbag24, plan on 3–4 working days as a rule.

Afterwards create a repair order online and send the unit in, well packed. Airbag24 checks it on the test bench, repairs defective components, deletes stored crash data and carries out a function test. Then your own unit is sent 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 89170-52F40 get to Airbag24?

You send the control unit 89170-52F40 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

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