Airbag control unit with part number 89170-33B80

What does the airbag control unit 89170-33B80 do?

The airbag control unit 89170-33B80 acts as the central unit for the restraint system (SRS) in Lexus. In an accident, it processes the values from the crash sensors and determines within a few milliseconds which airbags and seatbelt pretensioners are triggered.

Monitoring continues during normal operation as well. The unit outputs any faults it finds via the airbag warning light in the instrument cluster.

After an accident, it secures crash data and locks itself.

Why does the control unit 89170-33B80 fail?

The most frequent trigger is crash data from an earlier accident, even if no airbag was triggered. Aged components, cold solder joints, moisture or corrosion at plugs, and voltage spikes are also possible causes.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it as part of the repair.

Aged electronics can show a problem only after years in service. Cold solder joints arise from poor connections on the circuit board, which can come loose over time.

Moisture and corrosion attack the plug connections, and a weak battery or a jump start can cause voltage spikes that stress the electronics.

How can you tell that the 89170-33B80 is defective?

A fault shows up on the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Error messages may also appear, and the diagnostic tool may not reach the control unit. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Typical signs at a glance:

• airbag warning light on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool receives no connection to the control unit
• fault memory cannot be cleared

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

Which vehicles is the 89170-33B80 fitted in?

The control unit 89170-33B80 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The following list shows which vehicles are on record.

• Lexus ES AXZH60 (from 2018)

Two checks help before the repair. Compare the part number on the label of the removed unit with this page, which confirms you have the right unit. Have the fault memory read out in addition, because only this result shows whether the control unit is defective or whether a plug or cable is causing the fault.

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 89170-33B80 work?

Processing at Airbag24 usually takes 3–4 working days for inspection, repair and testing. Beforehand, you read out the fault memory, attach the log, disconnect the battery and remove the control unit. Then you create the repair order online and send in the unit.

Airbag24 checks the submitted control unit, repairs the faulty parts, erases the crash data and carries out a function test. Your own unit then goes back to you.

The 3–4 working days relate solely to the work 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 89170-33B80 get to Airbag24?

You send the unit as a package or book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Enclose the printed repair order in the package and pack the unit shockproof.