Airbag control unit with part number 89170-52K70

What does the airbag control unit 89170-52K70 do?

The airbag control unit 89170-52K70 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the crash sensor signals, determines within fractions of a second in an accident the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

The control unit shows faults via the airbag warning light in the instrument cluster, so that you can recognise them.

Why does the control unit 89170-52K70 fail?

The most common cause is crash data from an accident, even if no airbag has been triggered. Other causes are:

• ageing electronic components
• dry solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

A normal diagnostic tool cannot erase crash data. Airbag24 removes it from the unit during the repair.

How can you tell that the 89170-52K70 is defective?

A defect shows up as an airbag warning light that lights up constantly or intermittently, as fault messages in the instrument cluster, and as a fault memory that cannot be cleared. In addition, the diagnostic tool does not establish a connection to the control unit.

• airbag warning light on constantly or intermittently
• fault message in the instrument cluster
• no connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not be able to deploy. Do not ignore the warning light.

Which vehicles is the 89170-52K70 fitted in?

The airbag control unit 89170-52K70 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

The list of vehicles for this part number follows:

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

Match the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Have the fault memory read out beforehand, as only this result shows whether the 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 89170-52K70 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit 89170-52K70. Then create a repair order online and pack the unit well before sending it in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards 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 89170-52K70 get to Airbag24?

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

Put the printed repair order in the parcel, and the unit must be packed shock-proof.