Airbag control unit with part number 89170-52N50

What does the airbag control unit 89170-52N50 do?

In the Toyota vehicle, the airbag control unit 89170-52N50 is responsible for the restraint system (SRS). It evaluates impact signals and, in a crash, decides within milliseconds whether airbags and seatbelt pretensioners are triggered.

The unit monitors the system continuously. If it detects a fault, the airbag warning light in the instrument cluster comes on.

After a crash, it stores crash data and locks itself.

Why does the control unit 89170-52N50 fail?

Crash data left in the unit by a collision are the most common cause, even when no airbags have deployed. A standard diagnostic tool cannot delete them. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

In more detail, these further causes are significant:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

Especially after a crash without an airbag deployment, it is worth checking the memory.

How can you tell that the 89170-52N50 is defective?

The airbag warning light in the instrument cluster is on permanently or intermittently; a fault message may also appear in the instrument cluster. A diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared. A defect on the 89170-52N50 is then likely.

Airbags and seatbelt pretensioners may then fail to deploy in an emergency. Even if the vehicle runs normally in everyday use, this warning remains valid.

The warning light is therefore a direct sign from the unit, which is in plain view.

Which vehicles is the 89170-52N50 fitted in?

An assignment to vehicles exists for this part number. The control unit 89170-52N50 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017).

The known assignments are shown in this list:

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

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. It does not clarify the cause. For that you need the fault memory read out beforehand, because it shows whether the control unit is defective or whether a plug or cable is affected.

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 89170-52N50 work?

First read out the fault memory and attach the log. Then disconnect the battery and remove the control unit. Then create a repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench and replaces defective components before the stored crash data are deleted. The final step is a functional test; afterwards your own 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 89170-52N50 get to Airbag24?

The unit travels to Airbag24 as a parcel, or you book a UPS collection for an extra charge. UPS handles the return after the repair.

The printed repair order goes in the parcel; the unit itself is packed shockproof.