Airbag control unit with part number 89170-33P51

What does the airbag control unit 89170-33P51 do?

The airbag control unit 89170-33P51 forms the central control unit of the restraint system (SRS) for Lexus. It processes the measurements from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners fire, and checks the system without interruption.

It stores any faults it finds and reports them via the airbag warning light. After an accident it secures crash data and locks itself; only the repair lifts the lock.

Why does the control unit 89170-33P51 fail?

The most common cause is crash data that remained in the unit after an accident, even without a triggered airbag. Ageing electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes are added to this.

Crash data stays in the unit because a standard diagnostic tool cannot remove it. Airbag24 erases it completely during the repair.

Ageing electronic components also play a role, as do cold solder joints that can lose contact.

Moisture and corrosion on plug connections cause transition resistances, and voltage spikes, for example from a weak battery or jump-starting, put additional strain on the electronics.

How can you tell that the 89170-33P51 is defective?

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

It is precisely this light that makes the state of the restraint system directly visible, even when nothing else seems wrong.

A fault message that keeps reappearing, and a fault memory that cannot be emptied, are clear signs of a fault.

Which vehicles is the 89170-33P51 fitted in?

The information refers to the assignment at Airbag24. The unit 89170-33P51 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The list below shows the vehicles recorded for this unit at Airbag24.

• Lexus ES AXZH60 (from 2018)

Compare the part number on the label of the removed unit with this page, so that you have the correct unit in front of you. Have the fault memory read out beforehand, because only this log shows whether the control unit is faulty or whether a plug or 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 89170-33P51 work?

Processing at Airbag24 usually takes 3–4 working days. Before that, you read out the fault memory, attach the log, disconnect the battery and then remove the control unit. Create the repair order online and send the unit in well packed.

You start with the fault memory, and the battery is disconnected before removal; the sequence serves safety.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Afterwards your own unit comes 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 89170-33P51 get to Airbag24?

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

Enclose the printed repair order with the parcel and pack the unit shockproof.