Airbag control unit with part number 89170-50K41

What does the airbag control unit 89170-50K41 do?

The airbag control unit 89170-50K41 coordinates the restraint system (SRS) in Lexus. It processes the signals from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

Faults are indicated via the airbag warning light. The control unit is therefore the point at which the condition of the entire system can be read.

Why does the control unit 89170-50K41 fail?

Crash data from an accident is the most common cause, even when no airbag has triggered; a normal diagnostic tool does not erase it. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage peaks. Airbag24 erases the crash data during the repair.

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage peaks, for example from a weak battery or a jump start

The crash data is held in the memory of the control unit, and an ordinary diagnostic tool cannot access it.

How can you tell that the 89170-50K41 is defective?

The warning light in the instrument cluster signals the defect as soon as it lights up permanently or intermittently. Add to this a fault message on the instrument cluster, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be cleared. In that case, the airbags and seatbelt pretensioners may not trigger in an emergency.

Besides the light, fault messages and the missing connection to the diagnostic tool also point to a fault. Treat these signs as a reason for a prompt check.

Which vehicles is the 89170-50K41 fitted in?

The airbag control unit 89170-50K41 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The list follows below and names the vehicles for which this part number is on record.

• Lexus LS XF50 (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. Then have the fault memory read, because only that shows whether the control unit is defective or whether a plug or a 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 89170-50K41 work?

First read out the fault memory and attach the log; then disconnect the battery and remove the control unit 89170-50K41. Afterwards create a repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

The order is mandatory for safety reasons, and removal takes place only after the battery has been disconnected.

Airbag24 inspects the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Your own unit is then returned to you. The 3–4 working days apply only to testing, repairing and checking.

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 89170-50K41 get to Airbag24?

You send the control unit 89170-50K41 to Airbag24 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 in the parcel and pack the unit shockproof.