Airbag control unit with part number 89170-33E00

What does the airbag control unit 89170-33E00 do?

The 89170-33E00 is the airbag control unit in the restraint system (SRS) of Lexus. It evaluates the signals from the impact sensors, decides within a few milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

During normal operation the unit checks the connections and output stages of the connected components. It shows faults via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-33E00 fail?

The most common cause on the 89170-33E00 is crash data stored after an accident, even if no airbag was deployed; a standard diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

The storage runs in the background, regardless of whether an airbag was deployed.

With the other causes, aged components and cold solder joints may only become noticeable under load. Moisture and corrosion attack plug connections, and voltage spikes stress components inside the unit.

How can you tell that the 89170-33E00 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. If the 89170-33E00 is defective, airbags and seatbelt pretensioners may therefore not deploy in an emergency.

The warning light shows the defect. Have the system checked promptly as soon as it lights up.

A diagnostic tool that cannot establish a connection can also point to a fault in the control unit or its power supply. Only an inspection will clarify which cause applies.

Which vehicles is the 89170-33E00 fitted in?

The 89170-33E00 is fitted in these vehicles: Lexus ES AXZH60 (from 2018). Before removal, check whether your vehicle is among them.

The following vehicles are known to us for this part number:

• Lexus ES AXZH60 (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. Also have the fault memory read out beforehand, as only the 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 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-33E00 work?

For the repair of the 89170-33E00, first have the fault memory read out and enclose the log. Then disconnect the battery, and only then remove the control unit. Next, create a repair order online and send the well-packed unit in; processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Your own unit is then returned to you.

The stated processing time only covers the testing, repair and test at Airbag24. 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 89170-33E00 get to Airbag24?

You send the 89170-33E00 control unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-resistant.