Airbag control unit with part number 89170-52L00

What does the airbag control unit 89170-52L00 do?

As the airbag control unit 89170-52L00, this unit controls the restraint system (SRS) of Toyota. It evaluates the crash sensors and decides on airbags and seatbelt pretensioners in an emergency. After an accident it stores crash data and locks itself.

While driving, the electronics monitor the components and the wiring of the system. Faults appear via the airbag warning light.

In the event of a deployment, the unit decides within fractions of a second.

Why does the control unit 89170-52L00 fail?

Stored crash data is the most common cause with the 89170-52L00: the control unit retains it after an accident, even if no airbag has been triggered, and a normal diagnostic tool cannot remove it. Other causes are ageing components, cold solder joints, moisture and corrosion on the plug connections, and voltage spikes, for example from a weak battery or a jump start.

Crash data are records held inside the control unit itself. A diagnostic tool cannot remove them.

The other causes lie in the electronics or at the connections. Corrosion and damp affect plug contacts, ageing weakens components, and voltage spikes act on the circuitry.

How can you tell that the 89170-52L00 is defective?

On the 89170-52L00, defects show up as an airbag warning light that stays on constantly or intermittently, as a fault message in the instrument cluster, as a lost connection to the diagnostic tool, and as a fault memory that cannot be cleared.

• The airbag warning light is on constantly or intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool receives no connection to the control unit.
• The fault memory cannot be cleared.

With these signs, airbags and seatbelt pretensioners may fail to trigger in an emergency.

Which vehicles is the 89170-52L00 fitted in?

The airbag control unit 89170-52L00 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

The models are listed in the following list:

• 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 removed unit with the information on this page. This only confirms that it is the right unit. Have the fault memory read out before removal, because only that result shows whether the control unit is defective or 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 89170-52L00 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit, create the repair order online and send the unit off well packed. At Airbag24, checking, repairing and testing the 89170-52L00 usually takes 3–4 working days.

Airbag24 checks the unit, replaces defective components, erases the stored crash data and carries out a function test. Your own 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 89170-52L00 get to Airbag24?

The control unit 89170-52L00 is either sent as a parcel or collected by UPS for an extra charge. After the repair it goes back by UPS.

The printed repair order belongs in the parcel; the unit must be packed shockproof.