Airbag control unit with part number 89170-33P20

What does the airbag control unit 89170-33P20 do?

The airbag control unit 89170-33P20 is the control unit of the restraint system (SRS) for Lexus. It evaluates the signals from the crash sensors, decides within milliseconds in a crash on airbags and seatbelt pretensioners, and monitors the system at all times. It reports faults to the airbag warning light.

Monitoring accompanies the entire operation of the vehicle. The control unit therefore does not only start working in a crash, but checks continuously.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-33P20 fail?

Stored crash data from an accident is the most common cause, even if no airbag has fired; a normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture and corrosion on plugs, and voltage spikes are also possible.

The crash data remain in the unit after the accident, and that is exactly what makes them the trail to be followed first.

Whether one of the other problems is present as well is shown by the examination of the unit. Voltage spikes arise, for example, with a weak battery or after jump-starting.

How can you tell that the 89170-33P20 is defective?

The airbag warning light in the instrument cluster signals a defect as soon as it lights up constantly or intermittently. A fault message in the instrument cluster, a missing contact with the diagnostic tool and a fault memory that cannot be cleared also indicate a fault.

The warning light in particular is a clear sign that the restraint system is not working properly. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Which vehicles is the 89170-33P20 fitted in?

The airbag control unit 89170-33P20 is fitted in these vehicles: Lexus ES AXZH60 (from 2018). A look at the part number of the removed unit shows whether it fits your own car.

The following vehicles are affected:

• Lexus ES AXZH60 (from 2018)

Comparing the part number with this page only confirms that the correct unit is being removed. Have the fault memory read out in advance, because only the log clarifies 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 89170-06590, 89170-06880.

How does the repair of the 89170-33P20 work?

First have the fault memory read out; the log belongs with it. Then disconnect the battery and only after that remove the 89170-33P20. Next create the repair order online and pack the unit well for sending. At Airbag24 the processing usually takes 3–4 working days.

The test bench check covers the replacement of defective components, the erasing of stored crash data and a functional test.

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 89170-33P20 get to Airbag24?

The 89170-33P20 control unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return is made by UPS.

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