What does 'res' mean on a BMW?

1 Answers
JourneyLynn
07/30/25 5:02am
On a car, 'res' stands for the resume function of the cruise control system to restore the set speed. Introduction to cruise control function: When the cruise control button is pressed, the car can maintain that speed. The function immediately disappears when the brake pedal is depressed. How cruise control works: The cruise control component reads the pulse signal from the speed sensor and compares it with the set speed, then issues commands to the servo mechanism to adjust the throttle opening to increase or decrease, ensuring the vehicle maintains the set speed. Range of adaptive cruise control: Adaptive cruise control is not only suitable for highway conditions but also for urban driving conditions, including stop-and-go traffic. In contrast, regular cruise control is only suitable for good road conditions, such as highways with light traffic.
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