I've been hit & miss on working this hummer due to... life!
Anyway, problem started with abs and brake light on and would not go into 4Hi locked, 4Lo locked or tc neutral with dash mounted switch. It also had a U1000 code for abs. I pulled the abs pump, sent it off for test and rebuild. it was confirmed that it was not working and rebuilt. I reinstalled. went through the laundry of codes (at that time) and have since replaced the dash mount tc switch, the tc encoder motor, visually checked wiring, checked the grounding connector located on left kick panel/e-brake area for corrosion, checked the borg-warner tc case module, replaced front wheel speed sensors, checked/cleaned rear wheel speed sensors (they appeared to be new). now i have the following codes...
Powertrain Codes: P1626 anti-theft failure, U1057 Lost communications with suspension control system, U1064 Lost communications with body multiple control system, U1000 class 2 data link malfunction
Anti-Lock Brake System Codes: U1300 (history) class 2 data link low, U1000 (current/history) class 2 data link malfunction, U1064 Lost communications with body multiple control system
Shared Address Module Codes: B1440 (history) power mode master input circuits mismatch, B2610 (history) passenger compartment dimming #1, B2961 (history) key in ignition circuit malfunction,U1000 class 2 data link malfunction, U1152 (history) Lost communications with HVAC control system
Airbag Codes: U1000 (current/history) class 2 data link malfunction, U1016 (history) lost communications with engine control system, U1096 (history) lost communications with driver information and displays control system, U1064 (history) Lost communications with body multiple control system
Body Control Module Code: U1000 (current/history) class 2 data link malfunction
Amplifier Code: U1000 (current/history) class 2 data link malfunction
Vehicle Communication Interface Module Codes: B2470 (current/history) cellular phone antenna circuit malfunction, U1088 (history) Lost communications with restraints control systems, U1064 (history) lost communications with body multiple control system
Shared Address Module Codes: U1000 (current/history) class 2 data link malfunction, U1064 (history) Lost communications with body multiple control system

I think that one of the modules is tango uniform, any suggestions on how to determine which one without going module by module, plug by plug?

 

 

is this serial bus the one that has the green bonding cap that I checked for corrosion?

 

yes sir it is.
there are a few videos on GM can bus diagnostics you can find. most require a o-scope to look at the data coming through the bus for weirdness.

 

i kinda figured i would need an o-scope. I'll see if i can get some shop time from some of the local techs I know. have you ever just checked the pins for voltage to see if there was one that was low or high? curious if that could be done?

 

yes you can. but if there is data communicating your standard multimeter would not be quick enough to give you a steady voltage so you would get random rolling numbers. if you disconnect the battery you might have better luck looking for grounded pins using continuity then tracing those down. a cheap logic probe can also show data on a line. https://en.wikipedia.org/wiki/Logic_probe
this one explains that bus connector
has the drivers floor carpet been soaked in the past? the airbag module lives under the drivers seat bolted to the floor and does tend to get soaked and corrode pretty bad depending on how long its been soaked. just whatever you do. Do Not flip that module while the car battery is connected and the harness is plugged into it as it will deploy your air bags because of the internal rollover sensor. wait at least 5 minutes after disconnecting the battery so that the reserve power dissipates before handling