Airbag control unit with part number 89170-52L80

What does the airbag control unit 89170-52L80 do?

The airbag control unit 89170-52L80 controls the restraint system of Toyota as an SRS control unit. It processes the data from the crash sensors and, in the event of an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. In addition, it monitors the system without interruption.

It reports detected faults via the airbag warning light. After an accident, the unit creates crash data and locks itself; only the repair lifts the lock.

Monitoring takes place throughout the entire journey, whether or not you notice anything.

Why does the control unit 89170-52L80 fail?

Stored crash data is the most common cause, even if no airbag was triggered in the accident. Aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

This crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it during repair.

The other causes develop gradually. Electronic components lose reliability over the years, solder joints can become brittle, and moisture makes plug contacts corrode. Voltage spikes act briefly but place a strain on the circuit.

How can you tell that the 89170-52L80 is defective?

The airbag warning light in the instrument cluster can light up permanently or intermittently. An error message may accompany it, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. As long as this is the case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the first sign you notice in the vehicle. Have the fault checked even if the light comes on only now and then.

Which vehicles is the 89170-52L80 fitted in?

The airbag control unit 89170-52L80 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

The vehicles in detail:

• 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. Also have the fault memory read out beforehand, because only this log shows whether the control unit or 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 89170-52L80 work?

The repair of the 89170-52L80 begins with reading out the fault memory and enclosing the log. Then disconnect the battery and only then remove the control unit. Finally, create a repair order online and send the unit in well packed.

The unit is checked on the test bench at Airbag24, defective components are replaced, the crash data is erased and a functional test completes the work. Processing usually takes 3–4 working days.

The unit then 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 89170-52L80 get to Airbag24?

The control unit 89170-52L80 reaches Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

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