Installing OEM XM unit. PCM?

[R34P3R]

I own an 07 classic Silverado that did not come with the factory XM unit. I pulled one from a Tahoe at a junkyard a few days ago. I also took the harness which I knew I would be needing but I had to snip off the end that runs and disappears somewhere behind the gauge cluster. I'm told that the end I snipped runs to the PCM. This is where my problem is... My truck is a 4.3L V6, which I assume has a different PCM pinout than the average Silverado. I've spent hours and hours trying to find pinout diagrams but cant seem to find any for a 4.3L with the factory XM unit. So... I'm stuck... Can anybody point me in the right direction for this project?

I know I'll eventually have to take her to a shop to have the XM unit unlocked or what not, but that's later. I'm a hands on, doityourselfer, junky and if I could do it myself I would. I just want to get the XM unit running asap.

It's probably near impossible to find a 4.3L Silverado with factory XM at a junkyard... and if I did find one... I'm pretty sure they people there would hate me for shredding through its dash and fire wall just to find out what blade of grass the light green shade of the rainbow lands on... yes... I'm a bit OCD.

[R34P3R]

Okay so here is what i've done:

 

I connected the light green wire (serial data c2271) to pin #2 on the OBD connector (serial data c1132).

I connected the black and white wire (ground c1851) to the chasis.

and then i connected the orange wire (positive voltage c340) to a 15 amp fuse and the other end to the Wipers through the fuse box.

 

aaaaaaand nothing. I double checked my connections. Voltage was good.... but no dice.... any suggestions?