Kohler C3-050 Installation Manual page 7

Ensure if water inlet valve is OPEN.
The seat is activated by skin-to-seat contact. To activate the seat controls
for testing purpose, facing the toilet first, then hold seat from right front
edge about ½ position by hand, hear the seat on right side of the rotating
shaft generate one "click" (gravity induction).
The contact might not be activated if
customer does not sit all way in.
Note
It is difficult to activate contact for light weight children.
There's clearance between seat bumper to toilet due to mobile structrure
design.
Kohler Co.
Contact
(inside)
Switch ON
Toilet seat downward
Clearance
7 1305684-MY01-B