Need Pin IDs for Rear Audio controller

[99-2door]

I installed a 2000 Denali console in my 99 Tahoe. I also have installed steering wheel audio controls using a SWI-x to interface with my Pioneer head-unit. Now I need the pin IDs for the rear audio controls from the 2000 Denali so I can interface it also using the SWI-x. The dealership that usually let's me look at their books for info is not a GMC or Cadillac dealership so they don't have the manual for the Denali or Escalade. If anybody has a service manual or has the IDs ppleade let me know. Thanks