Electrical nightmare BCM?

Thank you, Ken, for the information. I will check the power and grounds for sure. Which can scanner do you recommend from amazon? Will post findings after I get a can scanner and test the power and grounds.

Ken. I was able to get the scan tool and it arrived today. I scanned it and have several codes. I'll list them below for you.
U1000
U1064
U1300
U1096
U1041

I still haven't been able to check the powers and grounds as of yet because of the storm that came through Georgia last week. Thanks for your help

It doesn't appear that any of the wiring has been messed with, however, the map lights in the front overhead has a wire ran from the fuse block under the steering wheel up to them that is hooked into the orange wire. It's hooked to switch powering the fuse block so the interior lights will only work when the switch is on. Will do some wire testing and see what I can come up with. Thanks again.

Ken, I was able to do a little testing Sunday and here is how I did it and what I found. I found a video that showed them unhooking the negative battery cable and hooking a test light from the cable to the battery and if the test light was dim, it had a draw on it. My test light was lit dim. It then said to pull one fuse at a time from the fuse box under the hood and if the light went out or got brighter then that was the draw. When I got to the amplifier fuse and pulled it the test light went to flickering. I reinstalled it and then pulled the radio fuse and the test light got brighter. I then unhooked the radio and the light went off. I'm assuming the radio was the draw, but I am not sure. If the car sits like on the weekends the battery will drain and it wont start. I rechecked the codes and I don't remember seeing the short to ground code present. I then went into the body and checked codes and there were 3 codes present b0029 passenger side deployment loop open, u1000 loss of serial communications for class 2 and u1064 loss of body control module (BCM)/ dash integration module (dim)/sbm communications. The weird thing that threw me for a loop was I could cycle the key and both U codes would go away. Cycle the key again and go back in to read the codes and both U codes would reappear. I cleared them out and restarted the vehicle and codes would reset immediately. Another thing that keeps throwing me off is when I go into the body section of my scan tool the only module that shows up is the supplemental inflatable restraint. Should it not show all of the modules? Thanks for your help and I can't wait to hear back from you on this.

Another thing I just thought of Ken. When I bought and received my programmed BCM I didn't remove the negative battery cable before I removed the old one and replaced it with the new one. Would that possibly caused damage to the new BCM and the reason the problems are still present?

Haven't seen where any wires were tampered with.
Yes, it does have a CD player in it.
What about the modules showing up on the scan tool? I'm attaching a picture of it for you.

Ken,

Does this model have a dash integration module and if so where is it located? When I bought the tahoe the blower motor was real noisy. I removed ot and found something had been in there making a nest. I was just wondering if that is where the dim module is around the glove box and maybe there might be some chewed wires. Thanks again for all your help.

Thanks Ken. I figured that was gonna be the next step. I'll let you know when I'm able to get it out and inspected on what my findings are.

Ken, I have searched high and low as to where the dash integration module is located, and I can't seem to find anything on it. Could you please tell me where it is located? Thanks again for the help so far.

It is the same problem. Never got anything fixed yet. Thanks for the response.

Ken, I got some news on what I was able to find this evening. I tested battery voltage at the dlc and it was good.I then moved to the bcm and removed the brown plug and tested the power and ground at the bcm and it had no power. I removed the cover for the underhood electrical box and low and behold I found a orange wire broken, chewed, etc. I had to add a price of wire because they were to short like a piece was missing. Now my auto headlights are working, daytime running lamps working, key in switch chime working, bright light indicator in cluster, and a few other things. I still don't have overhead lights when the doors are opened or when you turn them on and fog lights are still inop. Sorry for the long reply. Just wanted to give you a heads up on what I've found so far. Thanks again for the help. I'll update as I'm able to test other things out.