From the
G05 X5 tech info thread.
Here is how the new comfort access works:
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The Comfort Access system has also been enhanced vs the outgoing generation. When equipped, the vehicle is able to sense the key from a few feet away, and can automatically unlock and lock without having to touch the door handle. Upon approach, once the car recognizes the key, the ambient lighting and light carpet will come on, welcoming and guiding the driver to the door. This is activatable in the iDrive menu.
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Another great feature of Comfort Access is known as Smart Access. A spare keycard can be added to a vehicle when its equipped with Comfort Access, which will enable the driver not to carry the keyfob at all. Once paired, the keycard can be held up to NFC reader on the driver's door handle to unlock the car, and placed in the center console to start the engine.
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Spare keycard contact point with door handle and placement in center console: