Airbag control unit with part number 89170-33C10

What does the airbag control unit 89170-33C10 do?

The airbag control unit 89170-33C10 is the central control unit of the restraint system (SRS) of Lexus. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

Faults in the restraint system are reported by the airbag warning light in the instrument cluster. Monitoring covers all connected components, that is, sensors, airbags and seatbelt pretensioners.

In everyday use the control unit hardly stands out. It works in the background and only becomes visible when it detects a fault or is locked after an accident.

Why does the control unit 89170-33C10 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Other causes include voltage spikes, corrosion at plug connections, cold solder joints and aged components.

The crash data stay stored until they are specifically removed. A fault message may not appear immediately, but only at the next readout.

The other causes at a glance:

• Voltage spikes, for example from a weak battery or jump-starting
• Moisture and corrosion at plug connections
• Cold solder joints
• Aged electronic components

Which of these causes applies is shown only by a test of the system.

How can you tell that the 89170-33C10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears, and the diagnostic tool cannot establish a connection with the control unit. In this state, airbags and seatbelt pretensioners may fail to deploy in an emergency.

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

These signs point to a fault. A reliable statement about the cause is only possible after reading out the fault memory.

Have the fault memory read out promptly as soon as the light comes on.

Which vehicles is the 89170-33C10 fitted in?

The control unit 89170-33C10 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The list below shows the vehicles that Airbag24 has assigned to this part number.

• Lexus ES AXZH60 (from 2018)

Compare the part number on the label of the removed unit with this page, and you will have the right unit in front of you. Also have the fault memory read out beforehand, because only this result shows whether the control unit is defective or 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 89170-33C10 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Then create a repair order online and send in the well-packed unit. Airbag24 tests it on the test bench, repairs defective components, erases stored crash data and runs a function test.

Processing at Airbag24 usually takes 3–4 working days. After that the unit goes back to you.

The sequence protects you when working on the vehicle, which is why the battery is disconnected before removal.

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 89170-33C10 get to Airbag24?

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

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