Airbag control unit with part number 89170-33P50

What does the airbag control unit 89170-33P50 do?

The airbag control unit 89170-33P50 controls the restraint system (SRS) of Lexus. It checks the signals from the crash sensors, decides in an accident within milliseconds about triggering airbags and seatbelt pretensioners, and monitors the system continuously.

During normal operation the monitoring runs unobtrusively. If the unit detects a fault, it shows this via the airbag warning light in the instrument cluster, so that the driver is informed.

After an accident, the control unit stores crash data and locks itself. This behaviour is part of the design and is controlled by the unit itself.

Why does the control unit 89170-33P50 fail?

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

Crash data cannot be erased with a normal diagnostic tool. Airbag24 deletes it during the repair, and the unit is then checked.

The further causes at a glance:

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

How can you tell that the 89170-33P50 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then possibly not trigger.

Typical signs of a defect are:

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

With any of these signs, a check of the system is advisable so that the cause can be established.

Which vehicles is the 89170-33P50 fitted in?

The airbag control unit 89170-33P50 is fitted in these vehicles: Lexus ES AXZH60 (from 2018). Whether your vehicle is among them can be narrowed down with this list and the label on the unit.

The vehicles in detail:

• Lexus ES AXZH60 (from 2018)

Comparing the part number on the label of the removed unit with this page only ensures that it is the correct unit. Separately from this, have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-06590, 89170-06880.

How does the repair of the 89170-33P50 work?

First, have the fault memory read out and enclose the log. Then disconnect the battery before removing the control unit. Next, create a repair order online and send the well-packed unit in.

Airbag24 checks the unit on the test bench, repairs defective components, deletes crash data and carries out a function test. Your own unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days. This information refers solely to the testing, repair and testing carried out at Airbag24.

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 89170-33P50 get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shock-resistant. A firm padding protects it on the way.