Lexus RX (RX 350L, RX450h) 2016-2023 Owners Manual: BSM function

Introduction: With the advancement of technology in the automotive industry, Lexus has introduced the Blind Spot Monitoring (BSM) function on their RX models (RX 350L, RX450h) from 2016 to 2023. This cutting-edge feature utilizes radar sensors to detect vehicles in adjacent lanes that may not be visible in the outside rear view mirrors. By alerting the driver through indicators on the mirrors, the BSM function aims to enhance safety and minimize the risk of blind spot-related accidents.

How Does the BSM Function Work?

The BSM function operates by detecting two types of vehicles:

  1. Vehicles in Blind Spots: The BSM function identifies vehicles that are traveling in areas not easily visible using the outside rear view mirrors. This helps drivers stay aware of potential hazards in their blind spots.

  2. Rapidly Approaching Vehicles: The BSM function also detects vehicles that are rapidly approaching from behind in areas that are not visible using the outside rear view mirrors. This provides drivers with early warning of vehicles closing in on them.

BSM Function Detection Areas

The BSM function is programmed to detect vehicles within specific areas, including:

  • Approximately 1.6 ft. (0.5 m) to 11.5 ft. (3.5 m) from either side of the vehicle. It’s important to note that the area between the side of the vehicle and 1.6 ft. (0.5 m) from the side cannot be detected.
  • Approximately 3.3 ft. (1 m) forward of the rear bumper.
  • Approximately 9.8 ft. (3 m) from the rear bumper.
  • Approximately 9.8 ft. (3 m) to 197 ft. (60 m) from the rear bumper. The range depends on the speed difference between your vehicle and the detected vehicle, with a greater speed difference resulting in a longer detection range.

WARNING: While the BSM function is designed to enhance safety, it is crucial for the driver to prioritize safe driving and exercise caution. The BSM function is a supplementary tool and should not be solely relied upon. The driver’s visual confirmation of safety is always necessary, as the system may not function correctly under certain conditions.

When Does the BSM Function Activate?

The BSM function is operational only under specific conditions, including:

  • The BSM function is turned on.
  • The shift lever is in a position other than “R” (reverse).
  • The vehicle speed is greater than approximately 10 mph (16 km/h).

Limitations and Considerations

While the BSM function is a valuable safety feature, there are certain conditions under which it may not detect vehicles or function correctly. These include:

  • Small motorcycles, bicycles, pedestrians, etc.
  • Vehicles traveling in the opposite direction.
  • Guardrails, walls, signs, parked vehicles, and similar stationary objects.
  • Following vehicles in the same lane.
  • Vehicles traveling two lanes away from your vehicle.

It’s important to note that the BSM function may not detect vehicles correctly in situations such as misaligned sensors, obstructions on the rear bumper, driving in bad weather, or significant speed differences between vehicles. Similarly, there may be instances where the BSM function unnecessarily detects vehicles or objects due to sensor misalignment or unusual driving conditions.

Conclusion: The BSM function on Lexus RX models (RX 350L, RX450h) from 2016 to 2023 is an invaluable safety feature designed to detect vehicles in blind spots and rapidly approaching vehicles. While providing an added layer of security, it should always be complemented with safe driving practices. Understanding the capabilities and limitations of the BSM function ensures drivers can make informed decisions for a safer driving experience.

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