Airbag control unit with part number 89170-52K80

What does the airbag control unit 89170-52K80 do?

The airbag control unit 89170-52K80 controls the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors and decides within milliseconds in a collision which airbags and seatbelt pretensioners are triggered.

During operation, the unit monitors the entire restraint system. If it detects a fault, it stores it and indicates it via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and then locks itself. The data remains in the unit itself.

Why does the control unit 89170-52K80 fail?

For the 89170-52K80, the most common cause is crash data stored from an earlier accident, even if no airbag has triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a standard diagnostic tool. It therefore remains in the memory, even if the accident was a long time ago.

The other causes relate to age and environment. Electronic components age, solder joints can go cold, and moisture or corrosion affects the plug connections. Voltage spikes, for example from a weak battery or a jump start, also stress the electronics.

How can you tell that the 89170-52K80 is defective?

On the 89170-52K80, a defect shows through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through a fault message in the instrument cluster. In addition, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared. Then airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light is the warning the control unit issues itself. It remains on for as long as the detected fault exists.

Whether the cause lies in the control unit or in the wiring only becomes apparent when the fault memory is read out. Until then, it is not checked whether the restraint system works fully.

Which vehicles is the 89170-52K80 fitted in?

The 89170-52K80 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

Airbag24 has the following vehicles on record for this part number:

• 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. This only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a connector 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 89170-52K80 work?

First read out the fault memory and attach the log, then disconnect the battery and remove the 89170-52K80. Then create the repair order online and send the unit in well packed. 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 your own 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 89170-52K80 get to Airbag24?

You send the 89170-52K80 as a parcel or book a UPS collection for an extra charge. Airbag24 sends the unit back to you by UPS after the repair.

Place the printed repair order in the parcel and pack the unit shock-proof.