Airbag control unit with part number 89170-52K90

What does the airbag control unit 89170-52K90 do?

The airbag control unit 89170-52K90 runs the SRS restraint system in the Toyota. From the messages from the sensors it determines within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident it creates crash data and locks itself.

It also checks the system while driving and documents irregularities in the fault memory. The message to the driver runs via the airbag warning light.

Why does the control unit 89170-52K90 fail?

Stored crash data are the most common cause: they remain in the unit after an accident, even if no airbag was triggered, and a standard diagnostic tool cannot erase them. Aged components, cold solder joints, moisture and corrosion on plug connections, as well as voltage spikes, are also possible causes.

The crash data are held in the memory of the control unit, which is why they do not disappear with a diagnostic tool. Airbag24 erases them during the repair.

The other causes concern electronics and contacts. Components can age, solder joints can go cold, and moisture attacks plug connections. Voltage spikes, for example from a weak battery or a jump start, additionally stress the electronics.

How can you tell that the 89170-52K90 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. At the same time an error message may appear in the instrument cluster, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then possibly not trigger.

The light is a clear sign of a need for action that should not be postponed.

Which cause lies behind it is clarified by reading out the fault memory.

Which vehicles is the 89170-52K90 fitted in?

The control unit 89170-52K90 is equipped in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

The overview of the recorded vehicles follows here.

• Toyota Aqua NHP10 (2011-2015)
• Toyota Aqua NHP10 1st Facelift (2015-2017)
• Toyota Aqua NHP10 2nd Facelift (2017-2021)

Compare the part number on the label of the removed unit with this page. That only confirms that it is the right unit.

Have the fault memory read out before you remove the control unit. Only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 152100-4560, 89170-42D50.

How does the repair of the 89170-52K90 work?

At the beginning is the readout of the fault memory, whose log you enclose. Only after disconnecting the battery is the control unit 89170-52K90 removed. Afterwards you create the repair order online, and the packed unit goes on its way.

Airbag24 checks the unit, repairs defective components, erases the crash data and carries out a function test. Afterwards your own unit goes back to you. 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 89170-52K90 get to Airbag24?

For the route to Airbag24 you choose parcel shipping yourself or a UPS collection booked for an extra charge. After the repair, the unit 89170-52K90 returns to you by UPS.

The printed repair order is in the parcel. The packaging should be shock-resistant so that the unit stays protected during transport.