Dell Latitude D631 (Early 2009) - Manual (Page 26)

5. To install a WLAN card:
a. Move any antenna cables out of the way to make space for the WLAN card.
b. Insert the WLAN card into the system board connector at a 45-degree angle, and press the card into the metal securing tabs until you feel a click.
c. Connect the antenna cables to the WLAN card, ensuring that you route the cables correctly (see the cable routing diagram in Removing the
Display Assembly ).
Mobile Broadband Network (WWAN) Card
1 WLAN card 2 metal securing tabs (2)
NOTICE: To avoid damaging the WLAN card, never place cables on top of or under the card.
1 WLAN card 2 system board connector 3 antenna cable connectors
NOTE: For more specific information about which cable to connect to which connector, see the documentation that came with your WLAN card.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal
surface, such as a connector on the back of the computer.
NOTE: Mobile Broadband network cards may not be available in certain regions.