Lenovo ThinkPad Edge E420s Hardware Maintenance Manual page 92

Cable routing: When you install the antenna assembly, route the cables as shown in the following figure.
As you route the cables, make sure that they are not subjected to any tension. Tension could cause the
cables to be damaged by the cable guides, or a wire to be broken.
a
: Wireless LAN AUX antenna (black)
b : Wireless WAN AUX antenna (blue)
c : Wireless WAN MAIN antenna (orange)
d : Wireless LAN MAIN antenna (gray)
Note: Some models might have a third white cable for wireless LAN.
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Hardware Maintenance Manual