Airbag control unit with part number 89170-52J20

What does the airbag control unit 89170-52J20 do?

As an SRS control unit, the 89170-52J20 evaluates the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered in Toyota. The system is monitored continuously by the unit.

The unit shows faults it detects via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-52J20 fail?

The most common cause on the 89170-52J20 is crash data from an accident, even where no airbag has been triggered. Ageing components, cold solder joints, moisture, corrosion at plugs and voltage spikes also contribute.

An ordinary diagnostic tool does not erase crash data. Airbag24 removes it during the repair.

Ageing components and cold solder joints are among the other causes, as is moisture at plug connections.

Voltage spikes, for example with a weak battery or when jump starting, can place additional strain on the control unit.

How can you tell that the 89170-52J20 is defective?

The airbag warning light begins to light up on the 89170-52J20, either permanently or intermittently, when there is a defect. This may be accompanied by fault messages, a diagnostic tool without a connection, or a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

This light is a clear sign from the vehicle that a check is advisable.

A missing connection to the diagnostic tool does not have to originate in the control unit; cables are also possible.

Which vehicles is the 89170-52J20 fitted in?

The 89170-52J20 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021). This information refers to the assignment of this unit type to vehicles.

The list for comparison with your own car follows.

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

Firstly, compare the part number on the label of the removed unit with this page, which confirms that you have the right unit. Secondly, have the fault memory read out before removal, because only the log 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 89170-52J20 work?

You read out the fault memory and attach the log, then disconnect the battery and only then remove the control unit. The repair order is created online, after which the well-packed unit is sent off. At Airbag24, processing usually takes 3–4 working days.

Airbag24 checks the unit, works on defective components within the scope of the repair, erases crash data and carries out a functional test.

The unit is then returned 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 89170-52J20 get to Airbag24?

The 89170-52J20 reaches Airbag24 by parcel or with a UPS collection for an extra charge. The return after the repair is likewise made by UPS.

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