Airbag control unit with part number 89170-33N60

What does the airbag control unit 89170-33N60 do?

The airbag control unit 89170-33N60 forms the control centre of the restraint system (SRS) of Lexus. It evaluates the crash sensors and, in an accident, decides within milliseconds on airbags and seatbelt pretensioners. It indicates faults via the airbag warning light, and after an accident it stores crash data and locks itself.

Monitoring runs continuously in the background. To do this, the unit checks the signals and the connections to the triggers while the vehicle is in operation.

Why does the control unit 89170-33N60 fail?

The most common cause is crash data stored after an accident, even without an airbag having triggered, and a normal diagnostic tool cannot erase it. Further causes are aged components, cold solder joints, moisture at plug connections and voltage spikes.

Stored crash data therefore does not show that an airbag has triggered. The unit creates it as soon as it classifies an event as an accident.

The other causes develop gradually: components age, solder joints can be cold, and moisture attacks plug connections. Strong voltage spikes, for example from jump-starting or a weak battery, can also damage the unit.

How can you tell that the 89170-33N60 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. Then the airbags and seatbelt pretensioners may fail to trigger in an emergency.

The warning light indicates a defect directly, and you should not ignore it. A connection problem at the diagnostic tool does not necessarily lie in the control unit, however, since a plug or a cable can also be the cause.

Which vehicles is the 89170-33N60 fitted in?

The information refers to this part number alone. The control unit 89170-33N60 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The list names the vehicles stored for this part number:

• Lexus ES AXZH60 (from 2018)

On the one hand, compare the number on the label of the removed unit with this page. This ensures that it is the correct unit; the comparison shows nothing more. On the other hand, have the fault memory read out beforehand, because only that 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 89170-33N60 work?

The order matters: first have the fault memory read out and attach the log, then disconnect the battery and remove the control unit afterwards. Then create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, defective components are repaired, stored crash data is erased and a function test is carried out. Processing at Airbag24 usually takes 3–4 working days; 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 89170-33N60 get to Airbag24?

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

Enclose the printed repair order in the parcel and pack the unit so that it is shock-resistant.