What does the small car button on a Mercedes-Benz mean?

[VivienneMarie]

There are two small car buttons on a Mercedes-Benz, one on the left and one on the right. The left one is the Downhill Speed Regulation (DSR): DSR is an assistance tool for downhill driving. It maintains the vehicle speed set in the onboard computer. The steeper the downhill slope, the stronger the braking effect DSR applies to the vehicle. On flat roads or when driving uphill, the braking effect of DSR is minimal or non-existent. The right one is the Off-Road Driving Mode selection: The Off-Road Driving Mode is only available on vehicles without the Off-Road Engineering Package. It provides assistance during off-road driving and wading. The engine performance and the shifting characteristics of the automatic transmission are adjusted accordingly to meet off-road requirements.

[GenesisRose]

I've been driving a Mercedes-Benz for a while, and that small car button is actually the core control for starting the engine. You get in the car, press the brake pedal, and with a gentle press of the button, the engine starts immediately—it's very convenient and intuitive. Mercedes' design is quite user-friendly, with the button typically featuring a key-shaped icon, located near the steering wheel or on the center console. It works in tandem with the keyless entry system, sensing the key in your pocket and eliminating the need to take it out. When my friend first tried it, they were always worried something might go wrong, but it's actually very reliable. Pressing the button again when parked turns off the engine, with good safety protections. If the button ever fails, it's usually because the key battery is drained or the brake pedal isn't pressed firmly enough—replacing the battery or checking your posture can solve the issue. Mercedes' smart features make driving smoother, and regular key maintenance, like keeping it dry, is all it takes.

[VanReagan]

When I first bought my Mercedes, I was also confused about what that button was for. Now I understand it's used to turn the engine on and off. The specific operation is: press the brake pedal with your foot, then press that button, and the car starts; conversely, pressing it again turns the engine off. Mercedes designed it this way to simplify the process, eliminating the hassle of turning a key, making the experience much better than traditional cars. The first time I used it, I forgot to press the brake, and when nothing happened after pressing the button, I thought it was broken—later, the manual reminded me of the correct procedure. It's usually located near the dashboard, easy to reach. If it occasionally malfunctions, I suggest first confirming that the key is inside the car or that the battery has enough charge—this thing works wirelessly with little interference. During maintenance, be careful not to let dust or dirt accumulate on the button to extend its lifespan and keep it responsive. Overall, using it makes driving more convenient and saves time; new users will get used to it with practice.

[SanPreston]

That small button is Mercedes-Benz's engine start control key. Press the brake and push it to ignite, press again to turn off - the operation is intuitive and convenient. I use it every day while driving, positioned just right within easy reach. Integrated into the keyless system, it senses and starts when the key is present, with strong anti-theft functionality. Occasional malfunctions usually occur due to unengaged brakes or distant key fob - simple preventive measures suffice. This Mercedes design enhances driving efficiency.