Traced back wires as far as I could with no voltage going to lights.
I ran a jumper wire from light on inside of door that's tied to dome lights.
Works with dome lights now which is OK with me.
I don't think Tahoe's or Yukon's turn on the DRL and reverse lights for entry lights until 02 or 03 unless that's programmable in the BCM. I think that starts around the same time the LED's in the side mirrors shows up.