Airbag control unit with part number 89170-33N50

What does the airbag control unit 89170-33N50 do?

The airbag control unit 89170-33N50 controls the restraint system (SRS) of Lexus. It processes the signals of the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

During operation the unit monitors the system. 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 89170-33N50 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged components, moisture and corrosion, cold solder joints and voltage spikes.

• Aged electronic components
• Moisture and corrosion on plug connections
• Cold solder joints
• Voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a normal diagnostic tool. The other causes only become apparent when the unit is tested.

How can you tell that the 89170-33N50 is defective?

A defect shows up on the airbag warning light, which stays on permanently or intermittently. Beyond that there are further signs.

• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not trigger. If you notice any of these signs, have the system checked promptly.

Which vehicles is the 89170-33N50 fitted in?

The control unit 89170-33N50 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

In detail, the list shows which vehicles are affected.

• Lexus ES AXZH60 (from 2018)

Comparing the part number on the label of the removed unit with this page only ensures that you have the right unit. Whether the control unit is actually defective or a plug or cable is the cause, only the fault memory shows. Therefore have it read out beforehand.

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 89170-33N50 work?

First have the fault memory read out and attach the log, before you disconnect the battery and remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the test shows which components are affected. These are repaired, after which Airbag24 erases the stored crash data and carries out a functional test. Then the unit goes back 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 89170-33N50 get to Airbag24?

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

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