Airbag control unit with part number 89170-33T30

What does the airbag control unit 89170-33T30 do?

The airbag control unit 89170-33T30 is the central control unit of the restraint system (SRS) for Lexus. It processes the crash sensor signals, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It reports faults via the airbag warning light in the instrument cluster. This keeps the state of the restraint system visible to the driver at all times.

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

Why does the control unit 89170-33T30 fail?

The most common cause is crash data from an earlier accident, even if no airbag has deployed, because an ordinary diagnostic tool cannot remove it. Other causes are aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The first paragraph on causes contains the most important point: the crash data stays in the memory until it is removed during the repair.

The other causes mainly concern the electronics and their connections. Ageing and moisture act over months and years, while voltage spikes occur suddenly.

How can you tell that the 89170-33T30 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, a fault message appears in the instrument cluster, and the diagnostic tool has no connection to the control unit. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The fault memory cannot be cleared either. This sign complements the warning light but does not replace it.

If you notice any of these signs, have the system checked promptly.

Which vehicles is the 89170-33T30 fitted in?

The control unit 89170-33T30 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The following list shows the vehicles to which this part number is assigned.

• Lexus ES AXZH60 (from 2018)

Some steps help with the assignment. Compare the part number on the label of the removed unit with this page, which only confirms that it is the correct unit. Have the fault memory read out beforehand as well, because only the result 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 89170-33T30 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Then create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. Processing usually takes 3–4 working days. Afterwards your own, repaired unit is sent 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 89170-33T30 get to Airbag24?

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

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