

The Leviton Installation Guide, shows a bit more complicated diagram.

It seems like the power TO THE LIGHT is the black screw on the common (darker) screw because light will not turn on unless power is running through that wire on switch #2. With a working 3-way switch on there, power switches between the red and white depending on both switch positions. The 3-way switch has same configuration with a black wire in the common (darker) screw and white and red in same locations. The other 3-way switch, we will call it #2, also has a fan switch located with it in that box. There is always power despite switch position at the red and black wire. The switch has the black on the common (darker) screw, with red above it and the white by itself on the other side. It has 4 wires, the live black wire, red traveler, white traveler and ground. One 3 way switch, we will call it #1, is by itself. both 3-way switches function normally if I use them now.
#INDOOR MOTION SENSOR LIGHT SWITCH WIRING DIAGRAM INSTALL#
I am trying to install a motion sensor switch on a 3-way switch in my laundry room.
