ctc4Chev

Can anyone help? I have a 2016 diesel 2500HD and want to use the Upfitter X61A junction block - X7 plug/cable to run a lightbar. I need to add my own switch to ground, to control the X7 power relays for switch 3. I have added for switch 3 the relay, 30amp and 5amp fuses in the X50A Fuse Block, installed the upfittter X7 plug and cable in the X61A Junction block. The wiring schematic for the upfitter relays Page 396, has the trigger as X5-pin 11, however when I check the pins of the X61A Junction block -X5 pin schematic on page 593 pin 11 is assigned to "Lane Departure signal". I need help finding the 85/86 relay wire to attach a ground switch. Just a note: I plan on using pin 18 of the K9 Body control X5 plug as the ground. This should control the lightbar to only have power when the High Beam are on.