So this mystery still isn't solved. But here's another loop - I have the TCU module (bluetooth & assist). Could this be the issue? Considering purchasing the bluetooth kit. thoughts? Is there a difference as well as the harness provided? thoughts?

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2