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Perhaps all of these electrical problems can be the result of a bad ground. I would like to confirm this but I need to look up the wiring diagrams so I need to know if this is a SS, LS, LT or LTZ and what engine came in it, the 3.5l, 3.9l or 5.3l?
Sorry, I was out. Are you prepared to do some electrical testing using a voltmeter or 12 volt test light? If so, let me know which you will be using. In the meantime I need to download some wiring diagrams.
I can get you the wiring diagrams if you like. Let me know and in the morning, I'll upload them. It will be quite a few and I am ready for bed myself.
Looking at the rear lights wiring diagram, I see the ground for the left tail light is G302, located below the passenger front door opening, rear of right a-pillar.
According to the interior lights wiring diagram, the rear compartment lid release actuator is grounded to the very same G302 ground.
That is what led me to believe it might be a ground issue, but the instrument cluster lighting ground is actually G201.
What you are going to have to do or whomever is going to do the work is test with a voltmeter each individual circuit that is malfunctioning the very exact time that it is malfunctioning and determine where the open, short circuit or short to ground is occurring.