Airbag control unit with part number 89170-53880

What does the airbag control unit 89170-53880 do?

The airbag control unit 89170-53880 is the central control unit of the SRS restraint system for Lexus. It evaluates the signals from the crash sensors and determines in an accident which airbags and seatbelt pretensioners are triggered.

The unit also monitors the entire system while driving. If it detects a fault, it shows this via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and locks itself. This storage is part of the system logic and runs without any action by the driver.

Why does the control unit 89170-53880 fail?

The most common cause is crash data stored after an accident, even when no airbag has deployed; it cannot be erased with a normal diagnostic tool. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes such as from a weak battery or a jump start.

The stored crash data can lead to faults that cannot be fixed by diagnosis alone. Airbag24 removes this data during the repair.

Most of the other causes have to do with the age of the components. Moisture and corrosion attack the plug contacts, and cold solder joints become prone to faults over time.

How can you tell that the 89170-53880 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, an error message may appear, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared.

If the warning light stays on permanently, have the system checked promptly. In an emergency, airbags and seatbelt pretensioners may possibly not deploy.

A missing connection to the diagnostic tool points to the control unit or the line to it. Only the read-out of the fault memory provides a reliable answer.

Which vehicles is the 89170-53880 fitted in?

The control unit 89170-53880 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The vehicles assigned to this part number are listed below:

• Lexus LS XF50 (from 2018)

Compare the part number on the label of the removed unit with this page. That only tells you that it is the right unit, not yet whether it is defective. Having the fault memory read out beforehand shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-50K81, 89170-50K83, 89970-50090.

How does the repair of the 89170-53880 work?

First read out the fault memory and attach the log. Then disconnect the battery, and only then remove the control unit, before you create the repair order online. Airbag24 needs 3–4 working days for checking, repairing and testing.

Afterwards pack the unit well and send it in. The sequence is fixed for your safety and should not be changed.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards your own unit goes 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 89170-53880 get to Airbag24?

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

Enclose the printed repair order and pack the control unit shockproof.