Airbag control unit with part number 89170-52F10

What does the airbag control unit 89170-52F10 do?

The airbag control unit 89170-52F10 is the control unit of the restraint system (SRS) in Toyota. It evaluates the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The controller works constantly in the background and compares the measured values with the specifications. Deviations are reported via the airbag warning light.

Triggering depends entirely on this unit, which is why every fault must be taken seriously.

Why does the control unit 89170-52F10 fail?

The most common cause on the 89170-52F10 is crash data that remain in the unit after an accident, even without an airbag having deployed. A normal diagnostic tool cannot erase them. Aged components, cold solder joints and moisture at plug connections are also possible causes.

Airbag24 erases crash data during the repair; we examine the other causes on the unit.

Voltage spikes, for example from a weak battery or a jump start, strain the electronics. Cold solder joints and corrosion at plug connections can cause contact problems that disrupt the function.

How can you tell that the 89170-52F10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and on the 89170-52F10 this is the clearest sign of a fault. Alongside it, the instrument cluster shows an error message, and the diagnostic tool cannot find the control unit.

A light or message of this kind means that the system has detected a fault. This applies even if the vehicle shows no noticeable problems in everyday use.

In this state, airbags and seatbelt pretensioners may not deploy in an emergency. A fault memory that cannot be cleared is also one of these signs.

Which vehicles is the 89170-52F10 fitted in?

The assignment lists these vehicles for 89170-52F10: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017).

The vehicles assigned to this part number are listed here:

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

Comparing the number on the label of the removed unit with this page only confirms that it is the correct unit. Whether the control unit is defective or a plug or cable is the cause is shown by the fault memory, which you should have read out beforehand.

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 89170-52F10 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the control unit and create a repair order online. Send the well-packed unit in.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days.

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 89170-52F10 get to Airbag24?

You send the unit to Airbag24 as a parcel, or you book UPS collection for the 89170-52F10 for an extra charge. After the repair it is returned by UPS.

The printed repair order goes into the parcel, and the device is packed shockproof.