Airbag control unit with part number 89170-33P10

What does the airbag control unit 89170-33P10 do?

The airbag control unit 89170-33P10 coordinates the SRS restraint system of Lexus. It receives the measured values from the crash sensors, decides in an accident which airbags and seatbelt pretensioners are triggered, and monitors the entire system.

The decision must fall within fractions of a second, which is why the unit works without pause in the background. It assesses acceleration and deceleration and compares the values with stored thresholds.

The unit stores every detected fault in its memory and reports it via the airbag warning light. After an accident it additionally secures crash data and locks itself. Only the repair lifts the lock again.

Why does the control unit 89170-33P10 fail?

The most frequent trigger of a failure is stored crash data that remain in the unit after an accident, even if no airbag has fired. An ordinary diagnostic tool does not remove them. In addition there are causes that develop inside the unit over time.

Crash data remain stored after the accident, even when no airbags have been triggered. The unit cannot be reset by normal means. Further causes are:

• ageing electronic components in the housing
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example with a weak battery or jump-starting

How can you tell that the 89170-33P10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message appears in the display, and the diagnostic tool does not find the control unit. Furthermore, the fault memory cannot be cleared.

The light is the most important signal for the state of the system. When it is lit, the system has reported a fault that must be checked.

A missing contact with the diagnostic tool also indicates a problem. In an emergency airbags and seatbelt pretensioners may possibly not fire. Therefore have the system checked promptly once the light comes on.

Which vehicles is the 89170-33P10 fitted in?

The assignment lists the unit 89170-33P10 for these models: Lexus ES AXZH60 (from 2018).

The following vehicles are recorded:

• Lexus ES AXZH60 (from 2018)

First compare the part number on the label of the removed unit with this page. That way you see that you hold the right unit. Then have the fault memory read out, because the log shows whether the control unit is defective or whether a plug or cable causes the fault.

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

How does the repair of the 89170-33P10 work?

Processing at Airbag24 generally takes 3–4 working days and comprises inspection, repair and function test.

You begin by reading out the fault memory and enclose the log with the parcel. Then you disconnect the battery and only now remove the control unit. Finally you create the repair order online and send the unit in well packed.

Airbag24 examines the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. After that your own unit is sent back to you.

Processing at Airbag24 generally takes 3–4 working days. This period refers only to checking, repairing and testing.

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 89170-33P10 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. The return after the repair takes place by UPS.

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