Tried connecting it again, and 4 way flashers were flashing, could not turn them off. Reconnected one more time, and seems fine, hazard lights were off.
Also heard a click from my trunk. I don't know if this module is coded differently, or these GM3 modules without fins come from facelift version.
But thats how I burned my trunk actuator last time.
The top portion would not open, but when I pressed the button to open it, the bottom tailgate would open.
But since the top lid wouldn't open, I couldn't open the trunk before pulling the manual plastic string.