Access for the wireless card is under the access door for the hard drive. The guide below is for both wireless "B" and "G" cards which have two wires. It also has the reattachment guide for wireless "N" cards that have three wires. The attachment guide is below for proper lead placement. a link below wil take you to the service manual for this laptop, the numbers for illustrations match the repair manual.
1040 PCI Express Mini Card for 802.11 a/b/g wireless LAN
For access, remove these FRUs in order:
v “1010 Battery pack” on page 46
v “1020 Hard disk drive slot cover” on page 47
In step 2, unplug the jacks by using the removal tool antenna RF connector
(P/N: 08K7159) or pick the connectors with your fingers and gently unplug them
in direction of the arrow.
When installing: Plug the white cable into the jack labeled
MAIN on the card,
and the black cable into the jack labeled
AUX.
When installing: Plug the black cable (MAIN) into the jack labeled
1 on the card,
the white cable (AUX) into the jack labeled
2, and the gray cable
(MIMO) into the jack labeled
3 on the card.
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/42x3553_03.pdf
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