taillights

have no tail lights or dash lights. have no power to the lcm. what do I do?

Check fuses first. Taillights and dash lights are on the same circuit. Fuse should be labeled tail, taillights, or something along those lines.

If it checks out next thing to check is the multifunction switch.

If it checks out next thing to check is the multi-failure switch.

Corrected.

LMAO I was going to make a comment about GM and their crap ass quality control and how those things are known to fail across multiple models, but kept it to myself.