Airbag control unit with part number 89170-52K00

What does the airbag control unit 89170-52K00 do?

The airbag control unit 89170-52K00 controls the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, determines within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered, and monitors the entire system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. This way you learn in the vehicle when something is wrong.

After an accident the control unit stores crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 89170-52K00 fail?

Stored crash data is the most common cause: it remains in the control unit after an accident, even if no airbag has deployed, and cannot be cleared with a normal diagnostic tool. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

The stored crash data arises from an impact and remains in the unit until it is removed during the repair. That is why the memory is checked on the test bench first in the event of a failure.

The other causes tend to develop over a longer period. Moisture and corrosion attack the contacts, solder joints can give way, and voltage spikes act on the electronics instantly.

How can you tell that the 89170-52K00 is defective?

A defect shows up when the airbag warning light in the instrument cluster lights up permanently or intermittently. An error message in the instrument cluster, a diagnostic tool without connection to the control unit or a fault memory that cannot be cleared also point to a problem. In an emergency, airbags and seatbelt pretensioners may then not deploy.

The airbag warning light comes on as soon as the control unit detects a fault. It is therefore the most important signal you notice in everyday driving.

A diagnostic tool that cannot establish a connection indicates a problem that requires a check.

Which vehicles is the 89170-52K00 fitted in?

This part number is assigned to vehicles in our records. The control unit 89170-52K00 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

The assignment can be seen in the following overview.

• 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, so that you can be sure it is the correct unit. Have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a plug or 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 89170-52K00 work?

You first read out the fault memory and enclose the log before disconnecting the battery. Only then remove the control unit and create a repair order online. Next, send in the well-packed unit. Airbag24 checks it, replaces defective components, deletes the crash data, carries out a function test and returns your own unit. Processing usually takes 3–4 working days.

This time applies exclusively to checking, repairing and testing at Airbag24. The steps of removal and shipping are not included.

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 89170-52K00 get to Airbag24?

You send the control unit 89170-52K00 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order in the parcel and pack the unit shockproof.