Dell XPS 15 (L502X, Early 2011) - Manual (Page 24)

24 Wireless Mini-Card(s)
CAUTION: To avoid damage to the Mini-Card, never place cables under the card.
3 Insert the Mini-Card connector at a 45-degree angle into the system-board
connector.
4 Press the other end of the Mini-Card down into the slot on the system
board and replace the screw that secures the Mini-Card to the system
board.
5 Connect the appropriate antenna cables to the Mini-Card you are
installing. The following table provides the antenna cable color scheme for
the Mini-Cards supported by your computer.
6 Replace the module cover (see "Replacing the Module Cover" on page 16).
7 Replace the battery (see "Replacing the Battery" on page 14).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.
8 Install the drivers and utilities for your computer, as required.
NOTE: If you are installing a communication card from a source other than Dell,
you must install the appropriate drivers and utilities.
Connectors on the Mini-Card Antenna Cable Color Scheme
WLAN + Bluetooth (2 antenna
cables)
Main WLAN + Bluetooth (white
triangle)
Auxiliary WLAN + Bluetooth (black
triangle)
white
black
WWAN (2 antenna cables)
Main WWAN (white triangle)
Auxiliary WWAN (black triangle)
white
black
TV tuner (1 antenna cable) black