The key's range
In order for the key to work properly it needs to be within a certain distance from the car.
Using the key's buttons
The key's functions that are controlled by pressing a button have a range of approx. 20 metres (65 feet) from the car.
If the car does not verify a button being pressed - move closer and try again.
For keyless* use
For keyless use, a key must be within a distance of approx. 1 to 1.5 metres (3 to 5 feet) from the car's doors or tailgate.
Note
The key functions may be disrupted by surrounding radio waves, buildings, topographical conditions, etc. The car can always be locked/unlocked with the key blade.