Airbag control unit with part number 89170-53830

What does the airbag control unit 89170-53830 do?

The 89170-53830 manages the triggering of airbags and seatbelt pretensioners in the restraint system (SRS) of Lexus. It processes the signals of the crash sensors, monitors the system continuously and reports faults via the airbag warning light.

The evaluation takes place inside the unit, so that the decision in an emergency is made without delay.

Once the unit has registered an accident, it stores crash data and locks itself. This sequence is a fixed part of the system logic.

Why does the control unit 89170-53830 fail?

The most common cause for the 89170-53830 is stored crash data, even if no airbag has triggered; a standard diagnostic tool cannot remove this data. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data also arises from accidents without a triggering and stays in the memory of the unit. The diagnostic tool cannot remove it, so the entry remains visible in the system.

Aged components and cold solder joints lead to failures inside the unit.

Moisture and corrosion attack the plug connections, and voltage spikes, for example from a jump start, additionally load the unit.

How can you tell that the 89170-53830 is defective?

A defect on the 89170-53830 shows up on the airbag warning light, which stays on permanently or intermittently, on a fault message in the instrument cluster, on a diagnostic tool that makes no connection, and on a fault memory that cannot be cleared.

The warning light is the most important of these signs, because it continuously shows the state of the system. The message in the instrument cluster says the same in text form.

As long as such a finding exists, airbags and seatbelt pretensioners may fail to trigger in an emergency. Please have the system checked.

Which vehicles is the 89170-53830 fitted in?

The control unit 89170-53830 is fitted in these vehicles: Lexus LS XF50 (from 2018).

This is the assignment in list form:

• Lexus LS XF50 (from 2018)

Compare the part number on the label with this page to confirm that it is the right unit. In addition, have the fault memory read out; only this log shows whether the control unit is defective or a cable or plug 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 89170-53830 work?

First have the fault memory read out and hand the log over with the unit. Then disconnect the battery and only then remove the control unit 89170-53830. Next create the repair order online and send the unit in well packed.

At the test bench, Airbag24 examines the unit, repairs defective components, removes the stored crash data and carries out a function test. Afterwards your unit goes back to you. Processing usually takes 3–4 working days.

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 89170-53830 get to Airbag24?

A parcel with the control unit 89170-53830 goes to Airbag24, or you book a UPS collection for an extra charge. After the repair, Airbag24 delivers the unit back to you by UPS.

The printed repair order belongs in the parcel, and the packaging must be shock-proof.

Filling material should be distributed all round, so that the unit takes no knocks.