Airbag control unit with part number 89170-52G51

What does the airbag control unit 89170-52G51 do?

The airbag control unit 89170-52G51 is the control unit that holds the restraint system (SRS) together in Toyota. It receives the signals from the crash sensors and, in an accident, determines within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident the unit stores crash data and locks itself.

During operation the unit monitors the system and reports faults via the airbag warning light. This cycle of monitoring and triggering is the actual purpose of the control unit.

Anyone who knows this connection will more quickly understand why a fault in this unit affects the entire protection system.

Why does the control unit 89170-52G51 fail?

Stored crash data after an accident are the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot delete this data. Other causes with the 89170-52G51 are aged electronics, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The crash data are generated in the memory of the control unit. A diagnostic tool reads the fault memory without removing the entries.

The other causes are general in nature, because their effect differs from vehicle to vehicle. Electronics age, solder joints can break, and wetness or rust damage plug connectors. Voltage spikes, for example from a weak battery or jump-starting, also belong here.

How can you tell that the 89170-52G51 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the 89170-52G51 is defective. Accompanying this, the instrument cluster shows a fault message, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The light is not a minor matter, because it shows that the system has detected a fault.

In this situation, airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the finding checked promptly.

Which vehicles is the 89170-52G51 fitted in?

A comparison of the vehicles shows whether your car is affected. The control unit 89170-52G51 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017).

This is how the vehicles in which the unit is installed look:

• 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 only ensures that it is the correct unit. The actual clarification of the cause comes only from the read-out fault memory, because it shows whether the control unit is defective or whether a plug or cable is causing the fault.

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 89170-52G51 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit 89170-52G51. Next, create the repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit goes onto the test bench. There, defective components are repaired, stored crash data are deleted and a function test is carried out. 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 89170-52G51 get to Airbag24?

You send the control unit 89170-52G51 either as a parcel or book a UPS collection for an extra charge. After the repair you receive the unit back by UPS.

The printed repair order goes into the parcel, and the packaging must be shock-resistant.