Airbag control unit with part number 89170-33N51

What does the airbag control unit 89170-33N51 do?

In the vehicle, the unit 89170-33N51 controls the restraint system for Lexus. It evaluates the crash sensors, determines the deployment of airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously.

Part of its tasks is detecting faults during operation. It stores the faults it finds and reports them via the airbag warning light.

After an accident, the control unit stores crash data and then locks itself.

Why does the control unit 89170-33N51 fail?

The most common cause is crash data from an accident that are held in the unit even without a triggered airbag; a normal diagnostic tool cannot erase them. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

In addition, it is worth looking at the following causes:

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes from a weak battery or jump-starting

Which cause applies in an individual case only becomes apparent during an examination of the unit.

How can you tell that the 89170-33N51 is defective?

A defect manifests itself through the airbag warning light in the instrument cluster, which lights up constantly or intermittently, and through an error message in the instrument cluster. If the diagnostic tool cannot establish a connection to the control unit or the fault memory cannot be cleared, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the indication the control unit gives itself. A fault memory that cannot be cleared reinforces the suspicion that something in the system is disturbed.

A read-out with the diagnostic tool shows which message is present. Only then can it be said whether the control unit is affected.

Which vehicles is the 89170-33N51 fitted in?

A vehicle assignment is on record for this part number. The control unit 89170-33N51 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The assignment looks like this:

• Lexus ES AXZH60 (from 2018)

Comparing the part number on the label of the removed unit with this page ensures that you have the correct unit in front of you. It does not clarify the cause. For that, have the fault memory read out, because the result shows whether the control unit is defective or whether a connector or cable is responsible.

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 89170-33N51 work?

Have the fault memory read out first and attach the log to the parcel. Then disconnect the battery, remove the control unit and create a repair order online; the carefully packed unit is sent in afterwards. Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test before the unit goes back to you.

The order is mandatory for safety reasons, which is why the control unit is removed only after the battery has been disconnected.

Processing at Airbag24 usually takes 3–4 working days. This covers only checking, repairing and testing.

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 89170-33N51 get to Airbag24?

You can send the unit as a parcel or have it collected by UPS for an extra charge. Airbag24 sends it back to you by UPS after the repair.

A printout of the repair order belongs in the parcel. Pack the control unit shockproof so that it survives transport.