The Lexus RX350 Speed Sensor is important because it tells the computer systems in the vehicle exactly how fast the SUV and each of the wheels are moving; this lets computer systems such as the engine controller and ABS react instantly. In early models of the RX350, a passive Speed Sensor uses a magnetic pickup paired with a ferromagnetic tone wheel to produce a sinusoidal signal each time one of the teeth passes over, and later editions of the Lexus replace it with active Speed Sensor units that have built-in electronics for cleaner digital output, wider air gaps, and better low-speed accuracy. Both designs inject precise data to the vehicle speed module to keep the speedometer honest and to the wheel circuits that allow smooth traction control. Current RX350 trims are also based on Hall-effect and magnetoresistive versions of the Speed Sensor, providing resistance to dirt and vibration to enable reliable performance through harsh road conditions. Every recent Lexus RX350 also monitors each Speed Sensor for faults, triggering a dash alert if signals drop. Though their internal technology differs, the single goal of each Lexus Speed Sensor is to provide reliable and real-time velocity information.
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