Airbag control unit with part number 89170-33E40

What does the airbag control unit 89170-33E40 do?

The airbag control unit 89170-33E40 coordinates the airbags and seatbelt pretensioners of Lexus. It reads the crash sensors and triggers the appropriate restraint devices in an accident, within milliseconds.

The unit monitors the system continuously and shows faults via the airbag warning light. This makes it central to safety in the vehicle.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-33E40 fail?

For the 89170-33E40, stored crash data is the most common cause, even if no airbag has deployed in the accident. In addition there are aged electronics, cold solder joints, moisture and corrosion, and voltage spikes.

A normal diagnostic tool cannot erase this data. Airbag24 erases it during the repair, as part of the process.

Aged electronics and cold solder joints are not readily visible from outside. They are only reliably detected on the test bench.

Corrosion at plug connections and voltage spikes, for example from a weak battery or a jump start, are also possible.

How can you tell that the 89170-33E40 is defective?

A defect in the 89170-33E40 shows primarily as the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Further signs can also be seen with the diagnostic tool.

Look out for these signs:

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• fault memory cannot be cleared

If such signs appear, airbags and seatbelt pretensioners may not deploy in an emergency. The warning light is therefore a warning sign, not a detail.

Which vehicles is the 89170-33E40 fitted in?

With Lexus, this control unit is not fitted in every model, only in certain ones. The 89170-33E40 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The assignment includes these vehicles:

• Lexus ES AXZH60 (from 2018)

Comparing the part number on the label of the removed unit with this page confirms that you have the correct unit. It does not clarify whether the control unit is defective, though. For that, have the fault memory read out beforehand, because it shows 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 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-33E40 work?

The repair of the 89170-33E40 begins with reading out the fault memory, and you enclose the log. Processing at Airbag24 usually takes 3–4 working days.

Then disconnect the battery, remove the control unit and create the repair order online. Send the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components and erases stored crash data. A function test concludes the work. Afterwards your own unit is returned 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 89170-33E40 get to Airbag24?

For the trip to Airbag24, you send the 89170-33E40 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel, and the unit must be packed shock-resistant.