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As thought.... all issues were caused by a faulty BCM. Thanks for the diagnoses help.

Ditto..... on the tin foil.... it could be worse, like Lucas ("Prince of darkness") electrical. Thanks for all the great info and insights... Now, if I only had that scanner.... I'll post my results after I get bent over at the dealership.

Great info.... One more thing I forgot to mention.... the DRL's no longer function (bulbs are good and I swap out the relay) Here's what happened after removing the TBC fuse, the relay released and the headlights shut off. After replacing the fuse I removed the headlamp switch but...

The other night when I shut off the the Yukon the headlights stayed on. I had to unplug the headlight relay in the fuse block under the hood to shut them off. I replace the headlight relay but it did not rectify the issue. Only the headlights stay on (in either high and low beam), I went...