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The 4 Series Gran Coupe offers an optional heads-up display that projects speed, warning and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The IS doesn’t offer a heads-up display.
The power windows standard on both the 4 Series Gran Coupe and the IS have locks to prevent small children from operating them. When the lock on the 4 Series Gran Coupe is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The IS prevents the driver from operating the other windows just as it does the other passengers.
The 4 Series Gran Coupe’s standard Comfort Access allow you to unlock the doors from any outside door handle, open the trunk, and start the engine, all without removing the key from the pocket or purse. Smart Access standard on the IS doesn’t offer a sensor on the rear doors, so you’ll have to reach a front handle to unlock the rear door.
The 4 Series Gran Coupe’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The IS’ cruise control switches are unlit, making them difficult to find at night and operate safely.
The 4 Series Gran Coupe’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The IS’ standard manually variable intermittent wipers have to be constantly adjusted.
Laser headlights, optional on the 4 Series Gran Coupe, produce their light by firing blue lasers through phosphorus, a process that uses one-half the power of the IS’ LED headlights. Laser headlights can have double the range of LEDs with a much smaller surface area.
Both the 4 Series Gran Coupe and the IS offer optional heated front seats. The 4 Series Gran Coupe also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the IS.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the BMW 4 Series offers an optional wireless phone charging system (Qi) in the front center console. The IS doesn’t offer wireless personal charging.
The 4 Series Gran Coupe’s optional Parking Assistant Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The IS doesn’t offer an automated parking system.