Lenovo ThinkPad T400 Maintenance Manual page 87

Table 19. Removal steps of PCI Express Mini Card for wireless LAN (continued)
When installing:
v In models with wireless LAN card that has two antenna connectors, plug the
gray cable into the jack labeled MAIN on the card, and the black cable into
the jack labeled AUX. If the computer you are servicing has three cables, put
the white cable in the cable protection tube.
v In models with wireless LAN card that has three antenna connectors, plug the
gray cable (MAIN) into the jack labeled TR1, the white cable (3rd) into jack
labeled R0 or TR3, and the black cable (AUX) into jack labeled TR2 on the
card.
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ThinkPad T400 and R400