What is a Lexus UX UX300e airbag control unit?
The Lexus UX UX300e airbag control unit is the central safety unit of your electric vehicle, activating all occupant restraint systems in the event of an accident. It precisely monitors sensors and stores important crash data, ensuring the proper functioning of all airbag modules and seatbelt pretensioners in the vehicle. A professional repair will restore safety.
This control unit processes signals from impact sensors and decides whether to deploy the driver and front passenger airbags, as well as the seatbelt pretensioners. It is crucial for the passive safety of the Lexus UX 300e.
It also integrates seamlessly with other vehicle systems such as ABS, EBD, and VSC for comprehensive safety system coordination. Continuous self-tests ensure system integrity and enable error detection.
It controls various airbags, including knee, side, and curtain shield airbags, based on the specific equipment packages of the UX300e. The unit is centrally located, typically under the center console, for optimal sensor connectivity.
Why is the Lexus UX UX300e airbag control unit defective?
The Lexus UX UX300e airbag control unit frequently fails because it is sensitive to power surges, water damage, or internal software errors. After an accident, the control unit is considered defective due to the stored crash data, and a professional repair or replacement is required to restore full functionality of the safety systems.
A common cause of failure is internal component defects or corrosion of the connectors. This can be caused by moisture ingress or age-related material fatigue.
A short circuit in the vehicle electrical system or incorrectly connected diagnostic devices can also damage the control unit. Such incidents often lead to malfunctions and require a comprehensive diagnosis.
After the airbags are deployed, the control unit stores indelible crash data, making it impossible to use again without specific repairs. This data must be properly erased and the unit reset to factory settings to restore the Lexus UX UX300e airbag control unit to full functionality.
Common error codes for Lexus UX UX300e airbag control unit repair
Generic airbag error codes often occur during Lexus UX UX300e airbag control unit repairs, as model- and part-number-specific codes can often only be read using manufacturer tools. These codes typically indicate communication problems, internal device errors, or open circuits that require immediate diagnostics in the workshop.
- B1000 → Control unit communication error → Loss of data connection to the airbag control unit.
- B1100 → Internal error in the airbag control unit → Defect within the internal hardware or software of the module.
- B1861 → Open circuit in the airbag circuit (e.g. driver's knee airbag) → Interruption of the electrical connection to an airbag or belt pretensioner element.
- B1907 → Short to ground → Faulty wiring or components making an unwanted connection to the vehicle chassis.
- B1908 → Short circuit to battery (+12 V) → Direct contact of an airbag line with the vehicle electrical system voltage, which can lead to unintentional deployment.
- B1921 → Open circuit (e.g. rear left) → No electrical connection to a specific airbag or seat belt pretensioner element in the rear area.
- B1926 → Open circuit (e.g. rear right) → Missing electrical connection to an airbag or seatbelt pretensioner on the right rear side of the vehicle.
What part numbers are available for the Lexus UX UX300e airbag control unit repair?
For Lexus UX UX300e airbag control unit repairs, the original OEM part numbers 89170-0E720 and 8917076380 are primarily relevant and verified. These numbers identify the exact control units for your Lexus UX300e model, which is essential for a successful repair. Other supplier numbers are not currently publicly listed.
Both part numbers, 89170-0E720 and 8917076380, have been confirmed as airbag control modules in official Lexus spare parts catalogs for the Lexus UX 300e model. They are validated exclusively for this model.
No alternative or spare part numbers from well-known suppliers such as Bosch, Continental, Siemens, or Autoliv could be found specifically for the Lexus UX 300e airbag control unit. Therefore, repairs are often based on the original part.
Correct identification of the part number is crucial to ensure that the repaired or replaced control unit is fully compatible with the vehicle. This prevents further errors and ensures the full functionality of the airbag system.