Lenovo ThinkPad X12 Detachable Gen 1 Hardware Maintenance Manual page 87

Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause
the cables to be damaged by the cable guides, or a wire to be broken.
When installing: ensure that you connect the red cable to the main connector, and the blue cable to the
auxiliary connector.
Antenna locations
a
Wireless WAN antenna (auxiliary)*
b Wireless WAN antenna (main)*
.
Chapter 8 Removing or replacing a FRU
81