What Is The Diamond Button On A BMW Key Fob For?

BMW has long been at the forefront of integrating cutting-edge technology into its vehicles, and the company's key fob is no exception. While many competitors' key fobs only offer standard functions like locking, unlocking, and trunk release, BMW takes it a step further by including a unique option: the diamond-shaped button. It's customizable, allowing drivers to tailor its function to their specific needs. Pretty cool, right?

It should noted that, in some cases, particularly in BMW models made in the USA, the diamond button may be replaced with a panic button. But where it exists, drivers can use BMW iDrive with its 3D display to change the button's function, letting it do all sorts of things — from activating air conditioning on a hot day to turning on the headlights in a dark parking lot to unlocking the trunk for easy access.

Understanding this button's capabilities and customization options can make BMW ownership more convenient and enjoyable. What can this button do, and how can you set it up to fit your needs? Let's walk you through how it works.

It's worth noting that the availability and range of functions that can be assigned to the diamond button may vary depending on your specific BMW model (not to mention regional configurations). That said, one of the most useful assignments for the diamond button is to activate the vehicle's climate control system remotely. By pressing the button, drivers can initiate heating or cooling, making sure the cabin reaches a comfortable temperature before they enter the vehicle. This feature would be particularly useful for those that live in especially hot or cold regions.

Another common function is to turn on the vehicle's headlights remotely. This can be useful in poorly lit parking areas or when trying to locate your car in a large parking lot at night. Some drivers might also prefer to program the diamond button to lock or unlock specific parts of the vehicle, such as the trunk or rear windows. This customization gives quicker access to certain areas of the car without affecting the entire vehicle's lock status. For BMW owners in the U.K., the button might only be able to activate the headlights — customizations beyond this may be limited.

To customize the diamond button's function, you'll have to turn to BMW's iDrive infotainment system. This system provides an intuitive interface for drivers to personalize all sorts of aspects of their vehicle and its user settings, from navigation to cabin lighting and temperature. The steps to customize the diamond button may vary depending on the specific BMW model and the version of the iDrive system it uses, but here's a general guide that should help you out. 

To change its function, go to the Settings menu on your car's dash screen. Then, select Key Button Assignment. Here, you'll see a range of functions to choose from — including activating climate control, switching on the headlights, unlocking the driver-side door, opening the tailgate, and so on. Select a function and you're automatically good to go — no need to hit any "Save" or "Confirm" button.