What is a Lexus LC LC500 airbag control unit?
The Lexus LC 500 airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It continuously monitors data from numerous sensors, stores relevant crash data, and ensures precise deployment of the airbags and seatbelt pretensioners for maximum protection.
This module coordinates the deployment of all airbags in the vehicle, from the driver and passenger airbags to the side and curtain airbags. It processes signals from acceleration and impact sensors to accurately assess the severity of an accident.
The two-stage airbag deployment system adapts the inflation rate of the airbags to the impact intensity, resulting in more gentle occupant protection. It also activates the seatbelt pretensioners, which pull the occupants firmly into their seats before impact.
The airbag control unit is networked with other vehicle systems via the CAN bus to provide integrated safety. It features internal fault diagnostics and a self-test function that activates the SRS warning light in the event of problems.
Why is the Lexus LC LC500 airbag control unit defective?
A Lexus LC LC500 airbag control unit often fails because it permanently stores specific crash data after an accident, requiring replacement or professional repair. It can also fail due to internal electronic malfunctions, an unstable power supply, or water ingress.
The most common cause of a failure is an impact, in which the control unit stores and blocks crash information. This requires a special reset or replacement of the module to restore the airbag system to full functionality.
In addition, internal components of the control unit can be damaged by aging, overvoltage, or short circuits, leading to failures. Such internal errors can impair the module's ability to communicate or prevent the airbags from deploying.
Improper repairs or tampering with the vehicle's electrical system can also damage the sensitive control unit. A correct diagnosis is essential to determine the exact cause of the defect and successfully repair the Lexus LC LC500 airbag control unit.
Common error codes for Lexus LC LC500 airbag control unit repair
During Lexus LC LC500 airbag control module repairs, specific error codes often occur, indicating internal problems or communication issues within the module. These codes alert the driver via the SRS warning light and are crucial for accurately diagnosing the faulty system.
- B0091 → Control unit (control module) error → Internal malfunction of the airbag control unit or permanent storage of crash data.
- B1000 → Control unit communication error → Problems with data transmission between the airbag control unit and other vehicle systems (e.g. CAN bus problems).
What part numbers are available for the Lexus LC LC500 airbag control unit repair?
For the Lexus LC LC500 airbag control unit repair, four specific OEM part numbers are verified, ensuring complete compatibility and original quality. These numbers fit the first-generation Lexus LC 500 Coupe and Convertible exactly and are directly relevant to the airbag control unit, not sensors or other components.
The first verified original OEM part number is 89170-11020 . This is manufactured by Lexus and is listed in official spare parts catalogs.
Another valid part number for the airbag control unit is 89170-11140 . This number also comes directly from Lexus and has been confirmed by multiple sources.
For the Lexus LC 500 Convertible, part number 89170-60F30 is explicitly identified as suitable. It ensures compatibility with the convertible version of the vehicle.
Additionally, the OEM part number 89170-76630 is also verified for the Lexus LC 500 Convertible. All of these numbers guarantee a precise fit and function for the upcoming Lexus LC LC500 airbag control unit repair.