What are the plus and minus signs on both sides of the steering wheel?
3 Answers
The plus and minus signs on both sides of the steering wheel are paddle shifters. Pressing the plus paddle once increases the gear by one, while pressing the minus paddle once decreases the gear by one. Operation of paddle shifters: Paddle shifters are generally located behind the steering wheel. When using paddle shifters, the driver typically only needs to shift the gear into D, S, or manual mode. With paddle shifters, the driver can perform gear shifts without taking their hands off the steering wheel. Advantages of paddle shifters: Since paddle shifters are located behind the steering wheel, shifting gears is very convenient and efficient. This device is widely used in many rally races, circuit races, and even F1 events.
Speaking of the plus and minus buttons on both sides of the steering wheel, I use them frequently while driving, mainly to control the volume. Pressing the plus button increases the volume, and pressing the minus button decreases it—the operation is super convenient. The reason for this design is to allow drivers to adjust settings without taking their eyes off the road to search for buttons on the center console, enhancing safety. I’ve driven several car models, including German and Japanese brands, and most of them have this feature. Some models even allow customization, such as controlling air conditioning fan speed or switching radio tracks. The key is to regularly check if the buttons are responsive; dust buildup might cause them to stick, but a simple cleaning usually fixes it. Also, new car owners shouldn’t worry about using them incorrectly—they’re just simple switches and don’t involve complex circuits. Over time, I’ve found them incredibly handy, especially on highways when listening to music. A quick press adjusts the volume without distraction, significantly improving the driving experience.
From a technical perspective, the plus and minus buttons on the steering wheel are often viewed as simple control modules: the plus button serves as a trigger switch to increase volume, while the minus button decreases it. They are connected to the vehicle's audio system, with signal output adjusted via a microcontroller without occupying CPU resources. The design employs tactile buttons to prevent mechanical wear; wiring is concealed inside the steering wheel to reduce failure rates. I've tested the circuitry with a multimeter—normal current is minimal, generally avoiding short-circuit issues. It's advisable to regularly wipe the button area with a soft cloth to prevent oxidation and ensure reliable contact. In some high-end models, these buttons also integrate Bluetooth call controls, allowing adjustment of call volume. Overall, this is a user-friendly design that significantly enhances driving convenience, eliminating the need to fumble with the central console during busy moments.
