Airbag control unit with part number 89170-50K82

What does the airbag control unit 89170-50K82 do?

In Lexus vehicles the airbag control unit 89170-50K82 controls the restraint system (SRS). It processes the signals from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners to trigger, and monitors the entire system. After an accident it stores crash data and locks itself.

If it detects a fault, it reports this via the airbag warning light in the instrument cluster. Without this evaluation the airbags and seatbelt pretensioners could not be controlled correctly.

Why does the control unit 89170-50K82 fail?

Stored crash data is the most common cause with the control unit 89170-50K82, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Other causes are aged components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

After an accident, crash data is stored in the unit, and the control unit locks itself.

Components age over the years, plug connections corrode, and voltage spikes put strain on the electronics.

How can you tell that the 89170-50K82 is defective?

On the control unit 89170-50K82 a defect shows itself through an airbag warning light that stays on permanently or intermittently, through a fault message in the instrument cluster, through a missing connection to the diagnostic tool and through a fault memory that cannot be cleared. In an emergency the airbags and seatbelt pretensioners may then fail to deploy.

Take the warning from the warning light seriously and have the fault memory read out.

Even a vehicle that otherwise behaves normally can show such a warning.

Which vehicles is the 89170-50K82 fitted in?

The airbag control unit 89170-50K82 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The vehicles for this part number are listed in this overview:

• Lexus LS XF50 (from 2018)

Checking the part number on the label of the removed unit serves only to make sure you have the right unit. Only the fault memory read out shows whether the control unit itself is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-50K81, 89170-50K83, 89170-50L00, 89170-50L03, 89170-53790, 89170-53820.

How does the repair of the 89170-50K82 work?

You have the fault memory read out, enclose the log, and only then disconnect the battery; then you remove the control unit 89170-50K82. Next, create a repair order online and send the unit in well packed. Processing at Airbag24 covers examination, repair and function test and usually takes 3–4 working days.

First Airbag24 checks the condition of the unit. Then the defective components are repaired, the crash data is erased and the function test is carried out, before your own unit is returned.

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 89170-50K82 get to Airbag24?

You send the control unit 89170-50K82 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.