Airbag control unit with part number 89170-33A10

What does the airbag control unit 89170-33A10 do?

The airbag control unit 89170-33A10 is the central control unit of the SRS restraint system in vehicles of Lexus. It processes the signals from the crash sensors and, in a collision, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation the control unit checks the sensors and connections without interruption. It indicates faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 89170-33A10 fail?

Stored crash data after an accident is most often the cause on the 89170-33A10, even if no airbag has deployed. Ageing components, cold solder joints, moisture, corrosion at plug connections and voltage spikes are also possible.

A standard diagnostic tool does not erase such data. Airbag24 erases the crash data during the repair.

Ageing components and cold solder joints can distort signals. Moisture and corrosion attack plug connections, and voltage spikes arise, for example, from a weak battery or when jump-leads are used.

How can you tell that the 89170-33A10 is defective?

On the 89170-33A10 the airbag warning light in the instrument cluster lights up permanently or intermittently and thus indicates a fault. At the same time a fault message appears in the instrument cluster, or the diagnostic tool finds no connection and the fault memory cannot be cleared.

With such a finding, airbags and seatbelt pretensioners may possibly not deploy in an emergency. The warning light is therefore the indication you should take seriously.

Whether the control unit itself is affected is shown by reading out the fault memory.

Which vehicles is the 89170-33A10 fitted in?

This airbag control unit 89170-33A10 is fitted in these vehicles: Lexus ES ASV60 (2012-2015) and ASV60 Facelift (2015-2018). Compare the part number on the label with this page, and you will know that it is the correct unit.

The following vehicles are recorded for this control unit in our assignment:

• Lexus ES ASV60 (2012-2015)
• Lexus ES ASV60 Facelift (2015-2018)

Comparing the number is no proof of the cause. Only the protocol from the fault memory shows whether the control unit itself is defective or a plug or cable is the cause. Therefore have the fault memory read out before sending it in.

For the same vehicles, we also repair control units with the part numbers 89170-33840, 89170-33850, 89170-33860, 89170-33A00, 89170-33A20, 89170-33A40.

How does the repair of the 89170-33A10 work?

First read out the fault memory and attach the log, then disconnect the battery and only then remove the control unit 89170-33A10. Next create a repair order online and send in the unit. Checking, repairing and testing at Airbag24 usually take 3–4 working days.

The order of the first steps is prescribed for safety reasons and must be observed.

Airbag24 checks the unit on the test bench, renews defective components, erases stored crash data and performs a function test. After that your own unit goes back.

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 89170-33A10 get to Airbag24?

Either you send the control unit 89170-33A10 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel. Pack the unit shock-proof.