Airbag control unit with part number 89170-52C10

What does the airbag control unit 89170-52C10 do?

The airbag control unit 89170-52C10 is the control centre of the restraint system (SRS) for Toyota. It takes in the measured values from the crash sensors and decides in a collision, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During normal operation it checks the system continuously for faults. If a fault is found, the airbag warning light in the instrument cluster lights up.

If the unit has been involved in an accident, it records crash data and locks itself.

Why does the control unit 89170-52C10 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed. These cannot be erased with an ordinary diagnostic tool. Other general causes are aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is the most important point in itself, and Airbag24 erases it during the course of the repair.

Cold solder joints and moisture at the plugs are further possible candidates, and aged electronics is a rather gradual cause.

Voltage spikes, for example from a weak battery or a jump start, additionally load the circuit. They can also lead to malfunctions in the control unit.

How can you tell that the 89170-52C10 is defective?

A defect shows up as an airbag warning light that stays on continuously or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, or a fault memory that cannot be cleared.

As long as the warning is active, the airbags and seatbelt pretensioners may possibly not deploy in an emergency. That is the main reason to take such indications seriously.

A prompt check is therefore advisable, even if the vehicle continues to drive.

Which vehicles is the 89170-52C10 fitted in?

The 89170-52C10 is fitted in these vehicles: Toyota Yaris XP90 (2005-2009) and XP90 Facelift (2009-2011).

The vehicles are listed here:

• Toyota Yaris XP90 (2005-2009)
• Toyota Yaris XP90 Facelift (2009-2011)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Whether it is defective must be shown by the fault memory, which you have read out before removal. Only then is it clear whether the control unit or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 212986-105, 212986-110, 220749-101, 89170-0D170, 89170-0D230, 89170-0D440.

How does the repair of the 89170-52C10 work?

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

Airbag24 first checks the unit on the test bench and then repairs defective components. Stored crash data is erased, and a function test concludes the work. Processing at Airbag24 usually takes 3–4 working days, after which the 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 89170-52C10 get to Airbag24?

You either send the control unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

The printed repair order goes into the parcel. The control unit is packed shock-resistant for this purpose.