Airbag control unit with part number 89170-52L70

What does the airbag control unit 89170-52L70 do?

The airbag control unit 89170-52L70 controls the restraint system (SRS) for Toyota. It evaluates the signals of the crash sensors, determines in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit stores faults and displays them via the airbag warning light in the instrument cluster. This lets you recognise early that something is wrong in the restraint system.

After an accident the unit secures crash data and locks itself.

Why does the control unit 89170-52L70 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Also involved are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains stored, because a normal diagnostic tool cannot remove it. This data is therefore the first thing Airbag24 deals with during the repair.

The other causes can develop over years. Electronics age, solder joints can break, and moisture acts slowly but steadily on plugs. Fluctuations in the vehicle electrical system, for example with a weakened battery, also belong here.

How can you tell that the 89170-52L70 is defective?

The airbag warning light lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit and the fault memory cannot be cleared.

These signs can occur individually or together. As soon as they appear, the restraint system is no longer in its usual state, and airbags and seatbelt pretensioners may not deploy in an emergency.

Which vehicles is the 89170-52L70 fitted in?

The control unit 89170-52L70 is fitted in these vehicles: Toyota Aqua NHP10 (2011-2015), NHP10 1st Facelift (2015-2017) and NHP10 2nd Facelift (2017-2021).

These models are recorded for this part number:

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

Comparing the part number on the label of the removed unit with this page only confirms the identity of the unit. Have the fault memory read out beforehand, because only this result shows whether the control unit 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 89170-52L70 work?

First you read out the fault memory and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit in, well packed.

Airbag24 checks the unit on the test bench and repairs defective components. The crash data is then erased and a function test is carried out. The unit then comes back to you.

Processing at Airbag24 usually takes 3–4 working days, and this time covers only checking, repairing and testing. 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 89170-52L70 get to Airbag24?

You send the control 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 into the parcel, and pack the unit shock-proof.