Airbag control unit with part number 89170-33N40

What does the airbag control unit 89170-33N40 do?

The airbag control unit 89170-33N40 coordinates the restraint system (SRS) in vehicles from Lexus. Using the crash sensors, it detects an impact and determines within milliseconds which airbags and seatbelt pretensioners to trigger.

It also checks the function of all connected components on an ongoing basis. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident, the control unit stores crash data and locks itself. The following section explains the causes of failure.

Why does the control unit 89170-33N40 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains stored in the unit after an accident. A standard diagnostic tool cannot erase it; Airbag24 erases it during the repair.

Ageing and moisture also play a role. Electronic components age, solder joints can go cold, and moisture combined with corrosion at plug connections disrupts the contact.

Voltage spikes, for example from a weak battery or when starting with jump leads, are also among the causes.

How can you tell that the 89170-33N40 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. If the diagnostic tool cannot establish a connection to the control unit, or the fault memory cannot be cleared, this indicates a defect. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The warning light is the signal the system gives itself. Even a light that only comes on intermittently is a sign and deserves a check.

Have the vehicle checked by a workshop promptly and have the fault memory read out.

Which vehicles is the 89170-33N40 fitted in?

This unit is found in the following vehicles: Lexus ES AXZH60 (from 2018).

This overview helps with the comparison:

• Lexus ES AXZH60 (from 2018)

Comparing the part number on the label of the removed unit with this page ensures that you have the right unit. But have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether 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 89170-33N40 work?

Processing at Airbag24 usually takes 3–4 working days. Before sending, you read out the fault memory, enclose the log, disconnect the battery and only then remove the control unit; afterwards you create a repair order online.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Your own unit is then 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 89170-33N40 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.

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